Country：Japan

Award type：Honored in official journal of a scientific society, scientific journal  Country：Japan

Country：Japan

Award type：International academic award (Japan or overseas)  Country：Denmark

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Society of Rheology Japan  

<p>We investigated the effect of surface treatment for iron particles in the magnetorheological fluids (MRFs) on rheological properties. Silane coupling treatment with an excess amount of dodecyltrimethoxysilane (DTMS) was conducted for iron particles. MRFs were prepared by dispersing iron particles with and without the silane coupling treatment. MRFs with iron particles washed with <i>n</i>-hexane after the silane coupling treatment was also prepared. The rheological properties of MRFs were measured in the presence and absence of a magnetic field. Without a magnetic field, MRFs with the silane-coupled particles exhibited higher stress than the untreated particles. Under a magnetic field, MRFs with the silane-coupled particles showed lower stress than the untreated analogue. These results imply that the silane coupling treatment enhances the aggregation of particles without a magnetic field but suppresses the cluster formation under the magnetic field. MRFs with the washed iron particles exhibited almost the same rheological properties as that with the untreated particles. Thus we suggest that DTMS is mainly physically absorbed on the surface of iron particles, without forming chemical bonds.</p>

DOI： 10.1678/rheology.52.99

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Society of Rheology, Japan  

<p>Anisotropic shear relaxation is an interesting but rarely discussed issue in polymer dynamics under confinement. According to the earlier study of bead spring simulations for an unentangled polymer melt confined between two flat plates, the shear relaxation modulus taken perpendicular to the interface is accelerated by decreasing the distance between plates, whereas the parallel component is unchanged [Abberton <i>et al.</i>, Macromolecules, 48, 7631, 2015]. This study observed similar anisotropic shear relaxation for entangled polymer melts under confinement in multi-chain slip-link simulations (primitive chain network simulations) for shear relaxation moduli obtained by the Green-Kubo formula. The analysis demonstrated that the accelerated relaxation in the perpendicular component reflects the Rouse-type constraint release dynamics, for which the coarsening is upper-limited by the geometry. This result suggests a novel mechanism for anisotropic shear relaxation different from the modified chain statistics under confinement considered for unentangled systems unless the obtained relaxation moduli reflect artifacts from the use of the Green-Kubo formula under confinement.</p>

DOI： 10.1678/RHEOLOGY.52.77

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.polymer.2024.126880

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1678/rheology.52.21

Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Polymer Journal  

Fujiyabu et al. [1] experimentally reported that mixing of 3-arm star prepolymers into 4-arm analogs improves the toughness of the resultant polymer networks compared to that of the base network composed of only 4-arm star polymers. The present study investigated the mechanism of this phenomenon based on phantom chain simulations for polymer networks consisting of mixtures of star branch prepolymers with equal arm length and different arm numbers, (f1,f2)=(3, 4) , (3, 6) and (3, 8) , for various f1= 3 prepolymer fractions φ3 . These networks were created via end-linking reactions between prepolymers traced by a Brownian dynamics scheme, and the network structure was stored at different conversion ratios φc , ranging from 0.6 to 0.9. The cycle rank of the gelated networks ξ is entirely consistent with that given by mean-field theory, demonstrating that the examined network structure is statistically valid. The networks were stretched with energy minimization until the break, and fracture characteristics including strain at break εb , stress at break σb , work for fracture Wb , and the ratio of broken strands φbb , were obtained. Plots of εb , σb/ φbb , and Wb/ φbb versus ξ roughly follow the master curves reported for the base networks without mixing, implying that the change of fracture properties by the mixing of f1= 3 mainly corresponds to a decrease in ξ . The mixing slightly suppresses σb/ φbb and Wb/ φbb for large f2 cases compared to the base networks because of a biased breakage at the network strands without extenders, which are prepolymers with only two reacted arms. The analysis also revealed a new master curve for the ξ -dependence of the molecular weight of broken strands.

DOI： 10.1038/s41428-023-00862-w

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

DOI： 10.1021/acs.macromol.3c01708

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DOI： 10.1080/08927022.2023.2268730

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Society of Rheology, Japan  

<p>In the multi-chain slip-spring, the dynamics of Rouse chains connected by virtual springs called slip-springs that hop along the chain are considered. Although this approach has been proven to reproduce entangled polymer dynamics efficiently, the settings of the artificially introduced slip-springs should be carefully examined. In this study, we discussed the effect of the slip-spring degeneracy by limiting the number of anchored slip-springs on each Rouse bead to zero and one. According to the altered slip-spring statistics, we derived the compensation potential to eliminate the artifact of slip-springs on the chain statistics. With this potential, we performed numerical simulations. The results demonstrated that although we reasonably retain the Gaussian chain statistics, the dynamics deviate from the established entangled polymer dynamics because of the significant slow-down in the chain motion induced by the correlation between different slip-springs. The observed deceleration can be explained by the fact that the movement of slip-springs can be cast into an asymmetric exclusion process.</p>

DOI： 10.1678/rheology.51.211

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Wiley  

Abstract

We develop a novel Moving Particle Simulation (MPS) method to reproduce the motion of fibers floating in sheared liquids accurately. In conventional MPS schemes, if a fiber suspended in a liquid is represented by a one‐dimensional array of MPS particles, it is entirely aligned to the flow direction due to the lack of shear stress difference between fiber–liquid interfaces. To address this problem, we employ the micropolar fluid model to introduce rotational degrees of freedom into the MPS particles. The translational motion of liquid and solid particles and the rotation of solid particles are calculated with the explicit MPS algorithm. The fiber is modeled as an array of micropolar fluid particles bonded with stretching, bending and torsional potentials. The motion of a single rigid fiber is simulated in a three‐dimensional shear flow generated between two moving solid walls. We show that the proposed method is capable of reproducing the fiber motion predicted by Jeffery's theory which is different from the conventional MPS simulations.

DOI： 10.1002/fld.5235

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

DOI： 10.1021/acs.macromol.3c01291

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1038/s41428-023-00795-4

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Other Link： https://www.nature.com/articles/s41428-023-00795-4

Language：English   Publishing type：Research paper (scientific journal)   Publisher：Journal of Non-Newtonian Fluid Mechanics  

We revisit the transient response of entangled polymers in shear startup. Evidence from state-of-the-art experiments, modeling and simulations suggests the presence in fast flows of a weak (albeit unambiguous) undershoot, following the overshoot, i.e., while approaching the steady state. Recent sliplink simulations confirmed that the undershoot is not due to slip at the wall, and hence it is intrinsic to polymer rheology. Here, we further examine some features of the undershoot by blending two entangled homopolymers at different compositions. Since blending affects the distribution of relaxation times, it is here shown to also affect the undershoot, probably by broadening the tumbling-time distribution. Indeed, by appropriately modifying our tube-based model, that invokes tumbling to account for the undershoot, and (in parallel) by using simulations, we show how the undershoot depends on the blend composition. We map the experimental results into a diagram of terminal relaxation time versus composition, which identifies regimes where the undershoot is present. Blending is therefore proposed as a molecular mechanism to tailor the shear stress growth function signal, particularly the undershoot.

DOI： 10.1016/j.jnnfm.2023.105028

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Journal of Non-Newtonian Fluid Mechanics  

Description of the elongational rheology of concentrated polymers appears to require that in fast flows the friction coefficient decreases with respect to its equilibrium value. However, the proposed models typically maintain the validity of the fluctuation-dissipation theorem (FDT) out of equilibrium. On the other hand, FDT is routed in local equilibrium, the latter being clearly violated by the flow-induced monomer coalignment that induces friction change. A recent analysis by Watanabe et al. [Macromolecules, 54, 3700 (2021)] of unentangled polystyrene (PS) melts, based on a nonlinear extension of the Rouse model, indicates that FDT is indeed violated in fast flows. According to their analysis, the Brownian force intensity remains almost independent of the flow rate, even though the friction coefficient drastically decreases. A different violation of FDT is shown by previous nonequilibrium molecular dynamics simulations of PS oligomers [Ianniruberto et al., Macromolecules, 45, 8058 (2012)] where the diffusion coefficient grows more than the inverse friction coefficient. In this paper, Brownian simulations using a multi-chain sliplink model (the so-called primitive chain network model) are reported for two monodisperse entangled PS melts, for which nonlinear shear and elongational data were published. Two different friction reduction models are examined, and the effect of switching FDT on and off is tested. Results demonstrate that, irrespective of FDT, both friction models can reasonably well reproduce the behavior shown by the data. This result lends support to models that retain FDT since its violation appears not to significantly affect predictions of nonlinear rheology.

DOI： 10.1016/j.jnnfm.2023.105019

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER PHYSICAL SOC  

Rod-shaped particles embedded in certain matrices have been reported to exhibit an increase in their center of mass diffusivity upon increasing the matrix density. This increase has been considered to be caused by a kinetic constraint in analogy with tube models. We investigate a mobile rodlike particle in a sea of immobile point obstacles using a kinetic Monte Carlo scheme equipped with a Markovian process, that generates gaslike collision statistics, so that such kinetic constraints do essentially not exist. Even in such a system, provided the particle's aspect ratio exceeds a threshold value of about 24, the unusual increase in the rod diffusivity emerges. This result implies that the kinetic constraint is not a necessary condition for the increase in the diffusivity.

DOI： 10.1103/PhysRevE.107.044604

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

DOI： 10.1021/acs.macromol.3c00047

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Society of Rheology, Japan  

<p>In the framework of the tube model, the survival fraction of dilated tube, φʹ(<i>t</i>), is essential since the relaxation of the entire system is described according to this quantity. However, a method to define it in multi-chain simulations has yet to be considered. In this study, primitive chain network simulations were performed, and a few structural quantities were discussed as possible candidates for use as φʹ(<i>t</i>). Before analysis, the simulation was evaluated against literature data for linear polyisoprene melts, and quantitative agreement was obtained for viscoelastic and dielectric relaxations. Afterward, the end-to-end relaxation function was compared to survival probability of the slip link φ_s(<i>t</i>) and the ratio of monomers between the most distant surviving slip link pair to the total number of monomers <i>n</i>_s(<i>t</i>)/<i>n</i>_t. The result implies that <i>n</i>_s(<i>t</i>)/<i>n</i>_t is comparable to φʹ(<i>t</i>). Comparison to atomistic molecular dynamics (MD) simulations for polyethylene showed similar results, implying that φʹ(<i>t</i>) can be obtained even in MD simulations if the surviving entanglement points can be specified.</p>

DOI： 10.1678/rheology.51.19

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Review E  

Diffusivity in some soft matter and biological systems changes with time, called the fluctuating diffusivity. In this work, we propose a novel origin for fluctuating diffusivity based on stochastic simulations of binary gas mixtures. In this system, the fraction of one component is significantly small, and the mass of the minor component molecule is different from that of the major component. The minor component exhibits fluctuating diffusivity when its mass is sufficiently smaller than that of the major component. We elucidate that this fluctuating diffusivity is caused by the time scale separation between the relaxation of the velocity direction and the speed of the minor component molecule.

DOI： 10.1103/PhysRevE.107.014605

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Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Rheologica Acta  

In fast elongational flows, linear polymer melts exhibit a monotonic decrease of the viscosity with increasing strain rate, even beyond the contraction rate of the polymer defined by the Rouse time. We consider two possible explanations of this phenomenon: (a) the reduction of monomeric friction and (b) the reduction of the tube diameter with increasing deformation leading to an Enhanced Relaxation of Stretch (ERS) on smaller length scales. (Masubuchi et al. (2022) reported Primitive Chain Network (PCN) simulations using an empirical friction reduction model depending on segmental orientation and could reproduce the elongational viscosity data of three poly(propylene carbonate) melts and a polystyrene melt. Here, we show that the mesoscopic tube-based ESR model (Wagner and Narimissa 2021) provides quantitative agreement with the same data set based exclusively on the linear-viscoelastic characterization and the Rouse time. From the ERS model, a parameter-free universal relation of monomeric friction reduction as a function of segmental stretch can be derived. PCN simulations using this friction reduction relation are shown to reproduce quantitatively the experimental data even without any fitting parameter. The comparison with results of the earlier PCN simulation results with friction depending on segmental orientation demonstrates that the two friction relations examined work equally well which implies that the physical mechanisms of friction reduction are still open for discussion.

DOI： 10.1007/s00397-022-01373-w

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Chemistry Letters  

We report carbon nanotube (CNT) gels, formed by mechanically mixing CNTs, organic solvents, and a small molecule, Trip-Phz, that have a strong affinity for fullerene materials. There is a clear threshold value in the amount of Trip-Phz needed for the transition from soft to hard gels.

DOI： 10.1246/cl.220319

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Polymer Journal  

In this study, we examined the viscoelastic properties of a series of comb-shaped ring (RC) polystyrene samples with different branch chain lengths, i.e., the molecular weights of the ring backbone Mbb (≃ 4Me where Me is the entanglement molecular weight) and branch chains Mbr (≃ Me, 2Me, and 4Me). Even for the RC sample with the shortest branch chains, a plateau region was observed for the dynamic modulus G*(ω) in the middle angular frequency ω region, suggesting that intermolecular branch chain entanglement occurred. In the ω region between the plateau and terminal regions, G*(ω) was observed with a weaker ω dependence than the terminal relaxation. This behavior was more pronounced for RC samples with shorter branch chains and for the corresponding linear comb (LC) samples than for the RC ones. The molecular weight dependence of the zero-shear viscosity η0 and the steady-state recoverable compliance Jeo of the RC and LC samples was evaluated, and the effects of different backbone molecular structures (i.e., ring or linear) on the terminal relaxation behavior was discussed. Moreover, the G*(ω) data were analyzed with two models: the comb-Rouse model, in which the structures of the RC/LC molecules are taken into account by graph theory, and the Milner-McLeish model for entangled star-shaped polymers. The former model qualitatively described the terminal relaxation behavior of G*(ω) at low ω but failed to reproduce the plateau in the middle ω range. Conversely, the latter model described the entanglement plateau in the middle ω range, but the difference in the terminal relaxation regime for the RC/LC samples seen in the data and the comb-Rouse model disappeared.

DOI： 10.1038/s41428-022-00686-0

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Society of Rheology, Japan  

<p>We derive the stress tensor of a rigid dumbbell by using the virtual work method. In the virtual work method, we virtually apply a small deformation to the system, and relate the change of the energy to the work done by the stress tensor. A rigid dumbbell consists of two particles connected by a rigid bond of which length is constant (the rigid constraint). The energy of the rigid dumbbell consists only on the kinetic energy. Also, only the deformations which do not violate the rigid constraint are allowed. Thus we need the dynamic equations which are consistent with the rigid constraint to apply the virtual deformation. We rewrite the dynamic equations for the underdamped SLLOD-type dynamic equations into the forms which are consistent with the rigid constraint. Then we apply the virtual deformation to a rigid dumbbell based on the obtained dynamic equations. We derive the stress tensor for the rigid dumbbell model from the change of the kinetic energy. Finally, we take the overdamped limit and derive the stress tensor and the dynamic equation for the overdamped rigid dumbbell. We show that the Green-Kubo type linear response formula can be reproduced by combining the stress tensor and the dynamic equation at the overdamped limit.</p>

DOI： 10.1678/rheology.50.313

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Society of Rheology, Japan  

<p>Although chemistry dependence in the non-linear rheology of polymers has been rather established for uniaxial elongations, it has not been frequently discussed for fast shear. In this study, to see the effect of orientation-dependent monomeric friction on the shear rheology, we conducted primitive chain network simulations for a few poly(propylene carbonate) melts, for which we have determined the friction model from the uniaxial data recently [Yang <i>et al.</i>, Nihon Reoroji Gakkaishi, 50, 127–135 (2022)]. The simulation qualitatively reproduced typical non-linear behaviors, such as shear thinning and stress overshoot, under fast shears. The agreement with experimental data became better when the friction was varied according to the segment orientation. In particular, the shear rate dependence of the peak position for the stress overshoot (<i>i.e.</i>, the peak stress and the strain at the peak) was better reproduced. This result implies that chemistry-dependent friction may probably be discussed from the stress overshoot under high shear.</p>

DOI： 10.1678/rheology.50.305

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

Using Brownian dynamics simulations, we studied the mechanical properties of tetra-gel-type networks with varying arm length contrast of prepolymers to modulate the number of double linkages.

DOI： 10.1039/d2sm00488g

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society ({ACS})  

DOI： 10.1021/acs.jpcb.2c00697

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Polymers  

It has been established that the elongational rheology of polymers depends on their chemistry. However, the analysis of experimental data has been reported for only a few polymers. In this study, we analyzed the elongational viscosity of poly (propylene carbonate) (PPC) melts in terms of monomeric friction via primitive chain network simulations. By incorporating a small polydispersity of materials, the linear viscoelastic response was semi-quantitatively reproduced. Owing to this agreement, we determined units of time and modulus to carry out elongational simulations. The simulation with constant monomeric friction overestimated elongational viscosity, whereas it nicely captured the experimental data if friction decreased with increasing segment orientation. To see the effect of chemistry, we also conducted the simulation for a polystyrene (PS) melt, which has a similar entanglement number per chain and a polydispersity index. The results imply that PPC and PS behave similarly in terms of the reduction of friction under fast deformations.

DOI： 10.3390/polym14040741

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Society of Rheology, Japan  

<p>Nonlinear shear and elongational rheology of entangled poly(propylene carbonate) (PPC) melts having different molecular weights with relatively narrow molecular weight distribution are examined. In shear measurements, the PPCs exhibit a typical shear thinning behavior with stress overshoot at high shear rates. In the shear rate dependence of the steady-state viscosity, the PPCs do not violate the empirical Cox-Merz rule, which is known to be valid for many other entangled polymer melts. In uniaxial elongational measurements, the viscosity growth functions of the PPCs show a weak deviation from the linear viscoelastic (LVE) envelope to the higher side at the high Weissenberg number <i>Wi</i>_d (=<i>ετ</i>_d, where <i>ε</i> is the elongation rate and <i>τ</i>_d is the characteristic disengagement time). The steady-state viscosity of the PPCs shows an elongational thinning as a function of <i>ε</i>^−0.5 within an error. These results are similar to some other polymer melts such as polystyrene (PS). In addition, the normalized elongational viscosity growth functions of PPC and PS with a similar entanglement number <i>Z</i>, are compared. The PPC exhibits a similar viscosity growth curve to the PS at the same <i>Wi</i>_d. This result suggests that the degree of the monomeric friction reduction originated from the stretch/orientation of PPC under fast elongational flow might occur at the same level as PS.</p>

DOI： 10.1678/rheology.50.127

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Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1007/s00397-021-01286-0

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Other Link： https://link.springer.com/article/10.1007/s00397-021-01286-0/fulltext.html

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1122/8.0000194

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DOI： 10.1063/5.0036555

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DOI： 10.1021/acsabm.0c01533

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DOI： 10.1021/acs.macromol.0c01790

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Society of Rheology, Japan  

<p>Although the entanglement network among polymers has been widely investigated, the spatial distribution of entanglement nodes has been rarely discussed. In this study, we obtained the radial distribution functions (RDFs) for the entanglement nodes from the snapshots of multi-chain slip-link simulations. The model employed in this study is the primitive chain network (PCN) model, which has been validated to reproduce the entangled polymer dynamics semi-quantitatively. The statistics of captured entanglement networks were compared to those reported for the primitive path network extracted by the CReTA procedure from the full-atomistic molecular model of a polyethylene melt. In the range of distance longer than the average strand length, the network structure from PCN does not show any structural correlation, and the intra-chain correlation is close to that for Gaussian chains with non-interacting slip-links. These features are consistent with the CReTA network and the conventional assumptions made for single-chain models. Meanwhile, in the short-range, the structural correlation in PCN is much weaker than that in CReTA. This discrepancy is because the short-range structure in PCN is realized as a result of imposed fluctuations, whereas it is determined by the minimization of the primitive path in CReTA.</p>

DOI： 10.1678/rheology.49.337

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1678/rheology.49.171

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1678/rheology.49.73

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DOI： 10.1678/rheology.49.267

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DOI： 10.1016/j.patter.2020.100135

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DOI： 10.1103/PhysRevE.102.032104

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

<p>In slip-link simulations, the recovery of viscosity overshoot under interrupted shear flow reflects the relaxation of entanglement density during the interval between initial and resumed flows.</p>

DOI： 10.1039/d0sm00654h

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society of Rheology  

DOI： 10.1122/8.0000046

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

<p>We performed primitive chain network simulations for H-polymers in fast shear flows revealing molecular tumbling, and tumbling acceleration induced by branchpoint withdrawal (BPW). Furthermore, BPW not only mitigates backbone stretch but arm stretch as well.</p>

DOI： 10.1039/c9sm01971e

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society of Rheology Japan  

DOI： 10.1678/rheology.48.37

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Society of Rheology Japan  

DOI： 10.1678/rheology.48.43

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s13367-019-0024-3

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DOI： 10.1039/C9SM00681H

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DOI： 10.1007/s00397-019-01136-0

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.3390/polym11020370

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DOI： 10.1149/08801.0161ecst

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DOI： 10.1678/rheology.47.143

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DOI： 10.1021/acs.macromol.8b01954

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DOI： 10.7566/JPSJ.87.104602

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DOI： 10.1678/rheology.46.171

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DOI： 10.1039/c8sm00948a

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DOI： 10.1021/acs.macromol.8b00447

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DOI： 10.1038/s41467-018-04533-w

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DOI： 10.1678/rheology.46.145

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DOI： 10.1063/1.5001960

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DOI： 10.1039/c7sm01316g

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DOI： 10.1039/c7sm01229b

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DOI： 10.1038/s41598-017-08501-0

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DOI： 10.1021/acs.macromol.7b00572

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DOI： 10.1021/acsmacrolett.7b00153

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DOI： 10.1021/acs.macromol.6b00823

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DOI： 10.3390/polym9010024

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DOI： 10.1080/08927022.2017.1334883

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DOI： 10.1021/acs.macromol.6b01971

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DOI： 10.1021/acs.macromol.6b01642

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DOI： 10.1016/j.compscitech.2016.08.007

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DOI： 10.1007/978-981-10-0815-3_6

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Authorship：Lead author,　Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/1.4937172

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DOI： 10.1186/s40323-015-0035-7

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DOI： 10.1021/acs.macromol.5b00409

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Authorship：Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

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DOI： 10.1063/1.4901425

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DOI： 10.1021/ma501561y

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DOI： 10.1021/mz500627r

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DOI： 10.1021/ma5016165

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DOI： 10.1021/ma500357g

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DOI： 10.1021/ma402100t

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DOI： 10.1063/1.4794156

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DOI： 10.1063/1.4758320

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DOI： 10.1002/app.36593

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DOI： 10.1021/ma202525v

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DOI： 10.1007/s00397-011-0574-x

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DOI： 10.1021/ma202167q

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DOI： 10.1142/9789814360630_0002

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DOI： 10.1021/ma202166y

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DOI： 10.1021/ma201717e

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DOI： 10.1063/1.3658775

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DOI： 10.1007/s00397-011-0554-1

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DOI： 10.1016/j.polymer.2011.03.044

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DOI： 10.1063/1.3590276

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DOI： 10.1021/ma102595f

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DOI： 10.1063/1.3502681

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DOI： 10.1063/1.3370346

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN  

Prediction of relaxation behavior of polymeric materials from molecular architecture attracts industrial interests and scientific challenges. In this study a coarse-grained molecular model called primitive chain network model is developed. The model is capable for quantitative prediction of linear and non-linear viscoelasticity of entangled polymers. Also it is indicated that the simulation for cross-linked network is fair, though quantitative test is demanded.

DOI： 10.2324/gomu.82.459

Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1063/1.3225994

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DOI： 10.1063/1.3216110

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DOI： 10.1063/1.3140941

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DOI： 10.1002/polb.21715

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DOI： 10.1002/polb.21708

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DOI： 10.1021/bm801442g

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DOI： 10.1016/j.polymer.2008.10.024

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DOI： 10.1021/ma8013417

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DOI： 10.1021/ma800954q

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DOI： 10.1007/s00397-008-0258-3

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DOI： 10.3139/217.2030

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DOI： 10.1063/1.2899653

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DOI： 10.1016/j.polymer.2007.12.032

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DOI： 10.1016/j.jnnfm.2007.02.014

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

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DOI： 10.1063/1.2790007

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DOI： 10.1063/1.2747240

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Society of Polymer Science, Japan  

Entanglement among polymers is an established concept which stands for topological constraint on polymer dynamics in concentrated solutions and melts. Theories for polymer dynamics based on the entanglement idea such as reptation models and sliplink models have achieved remarkable success to reproduce experiments such as viscoelasticity. In the theories entanglement is assumed to be a dispersed structure carrying elasticity with relaxation and to corresponds a certain molecular weight much larger than Kuhn segment and much less than contour length. Though such a characteristic length has been confirmed experimentally, microscopic description of the entanglement among polymers has not been clarified yet. Recently methods to extract topological constraint in polymer melts by molecular simulations have been proposed by several groups independently and the topological network in the polymers has became observable. Comparison on statistics between the networks obtained by the molecular simulations and by the sliplink theories and simulations reveals the fact that structures of the networks originated from the theoretical assumptions of the sliplink and from the microscopic topological constraint among polymers are quite close. The similarity of the entanglement networks in different class of descriptions on polymers is promising link for multi-scale considerations though the nature of the network structures and the similarity are still open problems.

DOI： 10.1295/kobunshi.56.412

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.colsurfb.2007.01.020

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DOI： 10.1002/app.24492

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DOI： 10.1007/s00397-006-0112-4

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DOI： 10.1016/j.jnoncrysol.2006.01.144

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DOI： 10.1002/masy.200651021

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DOI： 10.1002/app.21503

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DOI： 10.1063/1.1819311

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：Journal of Robotics and Mechatronics  

This paper discusses a fully decentralized algorithm able to create a coherent swarm of autonomous mobile robots from the viewpoint of computational physics. To this end, we focus on Molecular Dynamics and Stokesian Dynamics, both of which are widely used to investigate many-body systems. To verify the feasibility of our approach, this idea has been implemented to a swarm of 2-D radio-connected autonomous mobile robots as a practical example. Simulation results indicate that the proposed algorithm can control the shape of the swarm appropriately based on the current situation without losing the coherence of the swarm nor exchanging global information among modules. Furthermore, we found that local interaction used to exploit Stokesian Dynamics plays an essential role to maintain the coherence of the swarm particularly in an unstructured environment.

DOI： 10.20965/jrm.2004.p0271

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Home Economics  

We evaluated the hydrophilicity by measuring the contact angles of model surfaces after their adsorption of dimethyldioctadecylammonium chloride (DMDOAC), a poly (vinyl acetate) emulsion (PVAcE), and their mixture. The adsorbent surfaces used were vacuum-dried organic macromolecular agar gel containing each additive, and hydrophilic glass sheets (glass sheets) and hydrophobic polytetrafluoroethylene sheets (PTFE sheets) with each additive attached. With increasing concentration of each additive, the contact angle of the agar gel (109° without an additive) markedly decreased in a similar hyperbolic manner to about 1/3, resulting in hydrophilization. The contact angle of the hydrophilic glass sheets (33 degrees) showed a maximum value (a 2-fold increase), indicating hydrophobilization, at a low additive concentration, but this angle gradually decreased thereafter with increasing additive concentration. However, the maximum value after adding the mixture was very low, and the change in contact angle was negligible with increasing additive concentration, showing only slight hydrophibilization. The hydrophobic PTFE sheets (120 degrees) showed properties similar to those of agar gel; the contact angle decreased after adding each additive, showing hydrophilization. The degree of hydrophilization after adding the mixture was marked;the contact angle was maintained at slightly more than 20 degrees with increasing additive concentration (about 100 degrees decrease), showing very high hydrophilicity.

DOI： 10.11428/jhej1987.55.145

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DOI： 10.1063/1.1605382

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Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/S0032-3861(03)00604-9

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DOI： 10.1007/s00397-002-0287-2

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Home Economics  

The time-course characteristics of the amount of water absorption in vacuum-dried agar gels containing dimethyldioctadecylammonium chloride (DMDOAC), poly (vinyl acetate) emulsion (PVAc-E) and their mixtures was measured in order to investigate the water absorbency of food model systems. Scanning electron microscopy showed the network of the gel containing DMDOAC more indistinctly than that of the gel of agar alone. The clear network of the gel mixed with PVAc-E could be observed by the adsorption of PVAc in which was coherent in several pieces. The gel containing the mixture of DMDOAC and PVAc-E showed a network with adsorbed PVAc which was coherent in several pieces and seemed to be covered by DMDOAC. The water absorption process for each gel involved in common two steps, the first absorbing water at a high rate for about 120 min, reaching an inflection point at that time, and then absorbing water at a low rate, finally almost reaching saturation, without being influenced by the presence or concentration of the additives. The initial rate and saturation weight of water absorption for the gel of agar alone were 0.85 g/g·min and 21.8 g/g, respectively. The initial rate and saturation weight of water absorption for the gel including DMDOAC and the gel including the mixture of DMDOAC and PVAc-E showed exponential and logarithmic decreases with increasing concentration. The initial rate and saturation weight of water absorption for the gel including PVAc-E showed the maximum values at 0.1 wt% and minimum values at 1.0 wt%, the characteristic changing from the exponential decrease.

DOI： 10.11428/jhej1987.54.343

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DOI： 10.1122/1.1516787

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Polymer Processing  

A technique to measure planar elongational viscosity and step-planar stress relaxation, by using a lubricated squeeze flow method with PS and LDPE, has been optimized and established. The effect of experimental conditions, i.e., the viscosity of silicone oil as a lubricant, appeared in the measurement of the planar elongational viscosity. The dependence of the uniform planar deformation behavior on the silicone oil viscosity was greater in LDPE than in PS. A high viscosity silicone oil (3.0&times;10²Pa-s) was chosen to minimize the loss of lubricant. Although the step-planar stress relaxation experiments required speeds that exceeded the testing machine specification to achieve the step deformation, this problem was successfully solved by inserting a metal spacer between the lower plate and the sample. The high viscosity silicone oil produced uniform deformation in both materials with minimal loss of the lubricant, however, the high viscosity of the silicone oil was believed to lead larger measured G⁰(t) results than the predicted values. The silicone oil viscosity was optimized at a lower value of 1.0&times;10¹Pa-s which minimized the influence of the silicone oil on the results while still producing substantial lubricity. The measurement of planar elongational viscosity by using this optimal silicone oil showed strain-hardening in both samples, with LDPE showing a stronger dependence. &ldquo;Time-strain separability&rdquo; within a certain time period was confirmed for the step planar stress relaxation modulus under the optimized conditions.

DOI： 10.4325/seikeikakou.13.563

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DOI： 10.1016/S0032-3861(99)00226-8

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Japan Society of Polymer Processing  

Measurements of uniaxial, biaxial, and planar elongational viscosity and step stress relaxation of a low density polyethylene (LDPE) melt were carried out. The description of experimental uniaxial, biaxial, and planar elongational viscosities results by the Kaye-Bernstein-Kearsley-Zapas (K-BKZ) constitutive equation was examined. Three types of damping function forms, Wagner-Demarmels (WD) model, Papanastasiou-Scriven-Macosko (PSM) model, and Luo-Tanner (LT) model, have been proposed in the K-BKZ constitutive equation. These three damping function forms were examined to see which was able to describe the experimental shear, biaxial, and planar damping functions. The experimental shear and biaxial damping functions were described by the LT and PSM models better than the WD model, however, the experimental planar damping function was not described well by any of the three models. After estimating the best parameters in each model by fitting the three experimental damping functions, the uniaxial, biaxial, and planar elongational viscosity was calculated by the estimated parameters. The uniaxial elongational viscosity was predicted best by the LT model, then by the WD, and PSM models. For biaxial and planar elongational viscosity, none of the three models predicted well, thus the lack of suitability of the biaxial and planar elongational viscosity to the K-BKZ model was suggested.

DOI： 10.4325/seikeikakou.11.517

Language：English   Publishing type：Research paper (scientific journal)  

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DOI： 10.1080/08927029908022068

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DOI： 10.2472/jsms.47.1296

Scopus

Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：繊維学会  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：繊維学会  

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Responsible for pages：391-392   Language：Japanese

Responsible for pages：339-342   Language：Japanese

Responsible for pages：607-612   Language：Japanese

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：The Society of Rheology, Japan  

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：Society of Rheology Japan  

DOI： 10.1678/rheology.50.391

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DOI： 10.1678/rheology.50.339

DOI： 10.1678/rheology.50.339

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：一般社団法人 日本レオロジー学会  

DOI： 10.1678/rheology.50.1

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：Japanese Society of Tribologists  

<p>Rheology is the science for flow and deformation of matters. Although rheology is closely related to tribology as seen in the Stribeck diagram, it must be separately considered. For instance, rheology has been developed for linear viscoelasticity owing to the linear response theory, whereas the material response discussed in tribology is in general under highly non-equilibrium. Besides, even under fast and large deformations, rheological measurements are usually performed under laminar flows and non-slip boundary conditions, which are far from the tribological conditions.</p>

DOI： 10.18914/tribologist.67.01_8

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DOI： 10.1678/rheology.50.147

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Authorship：Lead author,　Corresponding author   Language：Japanese   Publisher：The Society of Rheology, Japan  

DOI： 10.1678/rheology.49.49

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DOI： 10.1678/rheology.48.177

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DOI： 10.5650/oleoscience.19.461

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Last author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN  

Although molecular simulations are useful tool for material design, it is not straightforward to apply the technique to polymeric materials due to the long relaxation time. The widely used strategy to overcome this difficulty is 'coarse-graining' where a set of slow variables is chosen and the other state variables are statistically embedded into the time evolution of the chosen variables. However, there has not been any established method in this coarse-graining procedure, and thus, semi-empirical models have been proposed for each specific problem. This review showcases such models to clarify the position of each model in the context of the coarse-graining.

DOI： 10.2324/gomu.86.113

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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Language：Japanese  

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CiNii Books

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この論文は国立情報学研究所の電子図書館事業により電子化されました。

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Meeting report   Publisher：一般社団法人 プラスチック成形加工学会  

DOI： 10.4325/seikeikakou.15.547

CiNii Research

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Meeting report   Publisher：一般社団法人 プラスチック成形加工学会  

DOI： 10.4325/seikeikakou.14.40

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Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)   Publisher：Division of Chemical Information and Computer Sciences The Chemical Society of Japan  

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DOI： 10.11546/cicsj.20.88

Authorship：Lead author,　Last author,　Corresponding author   Language：Japanese   Publishing type：Meeting report   Publisher：一般社団法人 プラスチック成形加工学会  

DOI： 10.4325/seikeikakou.13.689

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Authorship：Lead author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

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