Molecular Rheology of Amorphous Polymers Studied with Electric Birefringence

用电双折射研究非晶态聚合物的分子流变学

• 批准号: 13450391
• 负责人: WATANABE Hiroshi
• 金额: $ 4.16万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450391/
• 关键词: Electric Birefringence; Viscoelasticity; Glass Transition; Dielectric Dispersion; Molecular Rheology; Polystyrene; Stress-Optical Rule; 誘電分散; ガラス転移領域; 複素カー係数

Electric birefringence (Kerr effect) of polystyrene melts (molecular weight 10500 and 1050) was measured under low electric field in the frequency range of 0.1 - 105 Hz at various temperatures near and above the glass transition temperature. Frequency-temperature superposition was applicable to obtain a composite curve. A weak dispersion of the complex Kerr coefficient was observed in the glass transition zone of the viscoelastic relaxation spectrum. The time evolution of the electric birefringence was found to be in accord with the relaxation of the "strain-induced" birefringence originated by main chain orientation after step strain. Similar measurement were also performed on polyisoprene having permanent type-A dipole. A dispersion due to the permanent dipole was observed in the terminal flow region of the Kerr coefficient and could be correlated the dielectic dispersion.

在玻璃化转变温度附近和以上的不同温度下，在0.1 - 105 Hz的频率范围内，测量了聚苯乙烯熔体（分子量为10500和1050）在低电场下的电双折射（克尔效应）。频率-温度叠加可用于获得复合曲线。在粘弹性弛豫谱的玻璃化转变区观察到了一个弱的复克尔系数色散。发现电双折射随时间的演化与主链取向引起的“应变诱导”双折射在阶跃应变后的弛豫过程雅阁。还对具有永久性A型偶极子的聚异戊二烯进行了类似的测量。在克尔系数的终端流区域观察到由于永久偶极子引起的色散，并且可以与介电色散相关联。

项目成果

Tadashi Inoue et al.: "Viscoelasticity of Polymers in θ Solvents around the Semidilute Regime"Macromolecules. 35巻24号. 9169-9175 (2002)

Tadashi Inoue 等人：“半稀释状态下 θ 溶剂中聚合物的粘弹性”《高分子》，第 35 卷，第 24 期。9169-9175 (2002)

Tadashi Inoue et al.: "Viscoelasticity of an Entangled Polymer Solution with Special Attention on a Characteristic Time for Nonlinear Behavior"Macromolecules. 35巻5号. 1770-1775 (2002)

Tadashi Inoue 等人：“特别关注非线性行为特征时间的缠结聚合物溶液的粘弹性”，《高分子》第 35 卷，第 5 期，1770-1775 (2002)

Hiroshi Watanabe et al.: "Rheo-dielectrics in okigomeric and polymeric fluids : a review of recent findings"Journal of Physics : Condenced Matter. 15巻11号. S909-S921 (2003)

Hiroshi Watanabe 等人：“低聚物和聚合物流体中的流变电介质：最近发现的综述”《物理学杂志：凝聚态物质》第 15 卷，第 11 期。S909-S921 (2003)

Tadashi Inoue et al.: "Viscoelasticity of Polymers in θ Solvents around the Semidilute Regime"Macromolecules. Vol. 35(24). 9169-9175 (2002)

Tadashi Inoue 等人：“半稀释状态下 θ 溶剂中的聚合物的粘弹性”，Macromolecules，第 35 卷（24）。

Tadashi Inoue et al.: "The Significance of the Rouse Segment : Its Concentration Dependence"Macromolecules. Vol. 35(3). 820-826 (2002)

Tadashi Inoue 等人：“Rouse 段的意义：其浓度依赖性”大分子。