Faculty Profiles - MASUBUCHI Yuichi

Papers - MASUBUCHI Yuichi

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Generalization of the Ohta-Kawasaki theory for microphase separation of block copolymer melts Reviewed International journal

Uneyama T, Masubuchi Y, Takimoto JI, Doi M

SLOW DYNAMICS IN COMPLEX SYSTEMS Vol. 708 page： 446-447 2004

Primitive chain network model for entangled polymer blends Reviewed International coauthorship International journal

Masubuchi Y, Takimoto JI, Doi M, Ianniruberto G, Greco F, Marrucci G

SLOW DYNAMICS IN COMPLEX SYSTEMS Vol. 708 page： 261-262 2004

Hydrophilicity Evaluated by Measuring the Contact Angles of the Adsorption Surfaces of Dimethyldioctadecylammonium Chloride, a Poly(vinyl acetate) Emulsion and Their Mixture Reviewed

HIGUCHI Saiji, MASUBUCHI Yuichi, MITSUMATA Tetsu, TAKIMOTO Jun-ichi, KOYAMA Kiyohito, SUZUKI Atsushi

Journal of Home Economics of Japan Vol. 55 ( 2 ) page： 145 - 151 2004

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

CiNii Research

Entanglement molecular weight and frequency response of sliplink networks Reviewed International coauthorship International journal

Masubuchi Y, Ianniruberto G, Greco F, Marrucci G

JOURNAL OF CHEMICAL PHYSICS Vol. 119 ( 13 ) page： 6925-6930 2003.10

Crystallization kinetics of polypropylene under high pressure and steady shear flow Reviewed International journal

Watanabe K, Suzuki T, Masubuchi Y, Taniguchi T, Takimoto J, Koyama K

POLYMER Vol. 44 ( 19 ) page： 5843-5849 2003.9

The effect of pre-thermal history on shear and uniaxial elongational viscosity of a tetrafluoroethylene/hexafluoropropylene copolymer near the crystal melting transition Reviewed International journal

Kurose T, Takahashi T, Nishioka A, Masubuchi Y, Takimoto J, Koyama K

RHEOLOGICA ACTA Vol. 42 ( 4 ) page： 338-344 2003.7

Direct observation of polymer crystallization process under shear by a shear flow observation system Reviewed International journal

Watanabe K, Nagatake W, Takahashi T, Masubuchi Y, Takimoto J, Koyama K

POLYMER TESTING Vol. 22 ( 1 ) page： 101-108 2003.2

Coherent swarming from local interaction by exploiting molecular dynamics and Stokesian Dynamics methods Reviewed International journal

Shimizu M, Ishiguro A, Kawakatsu T, Masubuchi Y, Doi M

IROS 2003: PROCEEDINGS OF THE 2003 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS, VOLS 1-4 page： 1614-1619 2003

Adaptive swarming by exploiting hydrodynamic interaction based on Stokesian Dynamics Method Reviewed International journal

Shimizu M, Ishiguro A, Kawakatsu T, Masubuchi Y, Doi M

SICE 2003 ANNUAL CONFERENCE, VOLS 1-3 page： 1546-1551 2003

Water Absorbency of Vacuum-Dried Agar Gels Including Dimethyldioctadecylammonium Chloride and Poly, (vinyl acetate) Emulsion Reviewed

HIGUCHI Saiji, MASUBUCHI Yuichi, MITSUMATA Tetsu, TAKIMOTO Jun-ichi, KOYAMA Kiyohito, SUZUKI Atsushi

Journal of Home Economics of Japan Vol. 54 ( 5 ) page： 343 - 349 2003

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

CiNii Research

Reversibility of the ER effect in immiscible liquid blends Reviewed International journal

Yamamoto S, Masubuchi Y, Takimoto J

INTERNATIONAL JOURNAL OF MODERN PHYSICS B Vol. 16 ( 17-18 ) page： 2468-2473 2002.7

The contribution of columnar structure to the stress in Er polymeric blends in a shear flow Reviewed International coauthorship International journal

Riha P, Takimoto J, Masubuchi Y, Koyama K

INTERNATIONAL JOURNAL OF MODERN PHYSICS B Vol. 16 ( 17-18 ) page： 2542-2547 2002.7

Simulation study on molecular relaxation in ionomer melts Reviewed International journal

Masubuchi Y, Nishioka A, Takimoto JI, Koyama K

POLYMER Vol. 43 ( 1 ) page： 239-242 2002.1

Rheological characterization of ionic bonding in ethylene-ionomer melts with low neutralization degree Reviewed International journal

Nishioka A, Takahashi T, Masubuchi Y, Takimoto J, Koyama K

JOURNAL OF RHEOLOGY Vol. 46 ( 6 ) page： 1325-1339 2002

Melt rheology of polypropylene containing small amounts of high molecular weight chain. I. Shear flow Reviewed International journal

Sugimoto M, Masubuchi Y, Takimoto J, Koyama K

JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS Vol. 39 ( 21 ) page： 2692-2704 2001.11

Brownian simulations of a network of reptating primitive chains Reviewed International coauthorship International journal

Masubuchi Y, Takimoto JI, Koyama K, Ianniruberto G, Marrucci G, Greco F

JOURNAL OF CHEMICAL PHYSICS Vol. 115 ( 9 ) page： 4387-4394 2001.9

Measurement of Planar Elongational Viscosity and Planar Stress Relaxation of Polymer Melts Using Lubricated Squeezing Flow Method Reviewed International journal

NISHIOKA Akihiro, MASUBUCHI Yuichi, TAKIMOTO Jun-ichi, KOYAMA Kiyohito

Seikei-Kakou Vol. 13 ( 8 ) page： 563 - 570 2001.8

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 (3.0×102Pa-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 1.0×101Pa-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. “Time-strain separability” within a certain time period was confirmed for the step planar stress relaxation modulus under the optimized conditions.

DOI： 10.4325/seikeikakou.13.563

Melt rheology of polypropylene containing small amounts of high-molecular-weight chain. 2. Uniaxial and biaxial extensional flow Reviewed International journal

Sugimoto M, Masubuchi Y, Takimoto J, Koyama K

MACROMOLECULES Vol. 34 ( 17 ) page： 6056-6063 2001.8

Melt rheology of ethylene ionomers blended with a small-molecule acid Reviewed International journal

Nishioka A, Takahashi T, Masubuchi Y, Takimoto J, Koyama K

POLYMER Vol. 42 ( 18 ) page： 7907-7910 2001.8

Uniaxial elongational viscosity of PS/a small amount of UHMW-PS blends Reviewed International journal

Minegishi A, Nishioka A, Takahashi T, Masubuchi Y, Takimoto J, Koyama K

RHEOLOGICA ACTA Vol. 40 ( 4 ) page： 329-338 2001.7

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Papers - MASUBUCHI Yuichi