圧力ジャンプを用いた高分子液体の動的階層構造の研究

利用压力跃变研究聚合物液体的动态分级结构

• 批准号: 12640392
• 负责人: TAKENAKA Mikihito
• 金额: $ 2.3万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640392/
• 关键词: Pressure-Jump; Microphase separation; Macrophase separation; Hierarchical structure; Complex fluids; Self-assembling process; Polymer Alloys; ブロックコポリマー; 秩序化過程

In this project, we focus on the viscoelastic effects during the phase separation and/or the relaxation process 'of the concentration fluctuations in dynamically asymmetric binary mixtures. In particular, we found the following : Relaxation processes of the concentration fluctuations induced by a rapid pressure change were investigated for a dynamically asymmetric polymer blend by using time-resolved small angle, neutron scattering. The pressure change was carried out inside the single phase blend with the cell designed for polymeric systems under high pressure and high temperature. Time change in the scattered intensity distribution with wave number (q) during the relaxation processes was found to be approximated by Cahn-Milliard-Cook linearized theory. The theoretical analysis yielded the q-dependence of Onsager kinetie coefficient which is characterized by the q^<-2>-dependence at qξve >1 with the characteristic length ξve being much larger than radios of gyration of DAB or PI. The estimated ξve agrees' well with that calculated using Doi and Onuki theory which takes into account the viscoelastic effects arising from the dynamical asymmetry between the component polymers in the relaxation of concentration fluctuations

在这个项目中，我们重点研究动态不对称二元混合物中浓度波动的相分离和/或弛豫过程中的粘弹性效应。特别是，我们发现了以下内容：通过使用时间分辨小角中子散射，研究了动态不对称聚合物共混物由快速压力变化引起的浓度波动的弛豫过程。压力变化是在单相混合物内进行的，该电池专为高压和高温下的聚合物系统而设计。发现弛豫过程中散射强度分布随波数 (q) 的时间变化可通过 Cahn-Milliard-Cook 线性化理论来近似。理论分析得出了Onsager运动系数的q依赖性，其特征在于qψve>1时的q^<-2>依赖性，特征长度ψve远大于DAB或PI的回转半径。估计的 νve 与使用 Doi 和 Onuki 理论计算的结果非常吻合，该理论考虑了浓度波动松弛过程中组分聚合物之间的动态不对称性所产生的粘弹性效应

项目成果

Mikihito Takenaka, et al.: "Structure Factor of Semidilute Polymer Solution under Continuous Shear Flow : Numerical Analysis of a Two-Fluid Model and Comparison with Experiments"Macromolecules. 34. 6461-6473 (2001)

Mikihito Takenaka 等人：“连续剪切流下半稀释聚合物溶液的结构因子：双流体模型的数值分析以及与实验的比较”大分子。

"Pressure dependence of thermal fluctuation effects on the order-disorder transition of diblock copolymer solutions"J.Appl.Cryst.. 36. 656-659 (2003)

“热波动效应对二嵌段共聚物溶液有序-无序转变的压力依赖性”J.Appl.Cryst.. 36. 656-659 (2003)

Mikihito Takenaka, et al.: "Experimental studies of stress-diffusion coupling in semi-dilute polymer solutions. I.'Viscoelastic length' and viscoelastic effects on early stage spinodal decomposition"Polymer. 42. 9193-9203 (2001)

Mikihito Takenaka 等人：“半稀聚合物溶液中应力扩散耦合的实验研究。I.‘粘弹性长度’和粘弹性对早期旋节线分解的影响”聚合物。

Mikihito Takenaka, et al.: "Viscoelatic effects in relaxation processes of concentration fluctuations in dynamically asymmetric polymer blends"Physical Review E. 65. 21806-1-21806-9 (2002)

Mikihito Takenaka 等人：“动态不对称聚合物共混物中浓度波动松弛过程中的粘弹性效应”Physical Review E. 65. 21806-1-21806-9 (2002)

Mikihito Takenaka, et al.: "Macro- and Microphase Transitions in Binary Blends of Block Copolymers with Complementalrily Asymmetric Compositions"Macromolecules. 34. 1707-1719 (2001)

Mikihito Takenaka 等人：“具有互补不对称组合物的嵌段共聚物二元共混物中的宏观和微观相变”大分子。