研究者詳細 - 増渕　雄一

論文 - 増渕　雄一

分割表示 226 件中 201 - 220 件目／全件表示 >>

A reaction kinetics model of water sonolysis in the presence of a spin-trap 査読有り国際誌

Yanagida H, Masubuchi Y, Minagawa K, Ogata T, Takimoto J, Koyama K

ULTRASONICS SONOCHEMISTRY 5 巻 ( 4 ) 頁： 133-139 1999年1月

Simulation Study on Effect of Polymer Entanglement on the Strain Hardening 査読有り国際誌

Y. Masubuchi, J. Takimoto and K. Koyama

Molecular Simulation 21 巻頁： 257-269 1999年

Melt strength and extrudate swell of high-melt-strength polypropylene 査読有り国際誌 Open Access

Sugimoto M, Masubuchi Y, Takimoto J, Koyama K

NIHON REOROJI GAKKAISHI 27 巻 ( 1 ) 頁： 67-68 1999年

A Brownian dynamics study of strain hardening of branching polymer melts 査読有り国際誌

Masubuchi Y, Takimoto J, Koyama K

SLOW DYNAMICS IN COMPLEX SYSTEMS 469 巻頁： 659-660 1999年

A systematic description by BKZ model of strain hardening or softening in uniaxial elongation of polymer melts 査読有り国際誌

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

JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS B38 巻 ( 3 ) 頁： 289-304 1999年

Electrorheological effect in liquid blends 査読有り国際誌

Kimura H, Aikawa K, Masubuchi Y, Takimoto J, Koyama K

SLOW DYNAMICS IN COMPLEX SYSTEMS 469 巻頁： 152-153 1999年

Strain-hardening property of polystyrene(PS) ultrahigh molecular weight(UHMW)-PS blends 査読有り国際誌

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

SLOW DYNAMICS IN COMPLEX SYSTEMS 469 巻頁： 649-650 1999年

低密度ポリエチレン溶融体の一軸，二軸，平面伸長粘度へのＫ‐ＢＫＺモデルの適応性査読有り

西岡昭博, 高橋辰宏, 増渕雄一, 滝本淳一, 小山清人

成形加工 11 巻 ( 6 ) 頁： 517 - 526 1999年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人プラスチック成形加工学会

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

CiNii Research

Systematic description by BKZ model of strain hardening or softening in uniaxial elongation of polymer melts 査読有り国際誌

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

Journal of Macromolecular Science - Physics 38 巻 1999年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Macromolecular Science - Physics

Homogeneous polymer melts show strain hardening, while recent uniaxial elongational studies have revealed that some heterogeneous polymer melts show strain softening. A systematic description and explanation about strain hardening of homogeneous polymers and strain softening of heterogeneous polymers is still needed. Here, the Bernstein, Kearsley, and Zapas (BKZ) model is applied to give a systematic description using model relaxation spectra and model damping functions. The effects of damping function and the longest relaxation time on the strain hardening or softening are investigated in terms of intensity and critical strain. The intensity, that is, the degree of hardening or softening, is defined as the degree of positive or negative deviation from the Trouton rule. The critical strain is defined as the strain at which the deviation starts. The intensity is strongly affected by the damping function. If α, the damping parameter in the said damping function, is more than 2, strain hardening appears. With α less than 2, strain softening occurs. It is suggested that strain hardening or softening in various polymer melts is able to be characterized by showing the location of each polymer in the proposed figures. It is proposed that a systematic description in terms of the BKZ model is capable of explaining not only the strain hardening of homogeneous polymer melts, but also the strain softening of heterogeneous polymer melts.

Scopus

Simulation Ssudy on Effect of Polymer Entanglement on the Strain Hardening 査読有り国際誌

Masubuchi Y., Takimoto J., Koyama K.

Molecular Simulation 21 巻 ( 5-6 ) 頁： 257 - 269 1999年

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Molecular Simulation

The effect of the molecular entanglement on the elongational viscosity was investigated by Brownian dynamics simulation in 2-dimension. The polymer was represented by freely-rotated bead-rod model. The entanglement constraint was assumed by a repulsive interaction between bonds in the chain and randomly located obstacles. Under an elongational flow, affine deformation was applied to spatial distribution of the obstacles. Varying lifetime and density of the obstacles, we investigated these effect on elongational viscosity. We found that (i) linear viscosity increases with increasing density while it is independent of the lifetime, that (ii) critical strain rate at which the strain hardening begins is independent of both the lifetime and the density, that (iii) the longer lifetime gives the stronger strain hardening, and that (iv) when the density becomes higher than entanglement threshold of the chain, the strain hardening is discontinuously enlarged. Brownian dynamics; polymer rheology; strain hardening; polymer entanglement; elongational flow; elongational viscosity.

DOI： 10.1080/08927029908022068

Scopus

Measurement of biaxial elongational viscosity of polymer melts using lubricated squeezing flow method 査読有り Open Access

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

Zairyo/Journal of the Society of Materials Science, Japan 47 巻 ( 12 ) 頁： 1296 - 1300 1998年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Zairyo/Journal of the Society of Materials Science, Japan

Biaxial elongational rheometer using lubricated squeezing method has been installed. To start up the rheometer and to obtain reproducible and reliable data, the effects of experimental conditions on biaxial elongational viscosity data were investigated. Constant area method was preferable rather than constant volume method. It was concluded that the effects of the viscosity of silicone oil and the shape were neglisible when method of constant area was employed.

DOI： 10.2472/jsms.47.1296

Open Access

Scopus

充填系高分子溶融体の一軸伸長下での歪み硬化特性と内部変形査読有り

高橋辰宏, 中島広和, 増淵雄一, 滝本淳一, 小山清人

繊維学会誌 54 巻 ( 10 ) 頁： 538 - 543 1998年10月