Universality of Viscoelastic Phase Separation in Dynamically Asymmetric Polymer Mixture

动态不对称聚合物混合物中粘弹性相分离的普遍性

• 批准号: 06452105
• 负责人: TANAKA Hajime
• 金额: $ 4.16万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452105/
• 关键词: Dynamic Asymmetry; Phase Separation; Dynamic Light Scattering; Molecular Dynamics; Viscoelastic effects; Network structure; Pattern Formation; Critical Fluctuation; ダイナミクス; 動的臨界現象; 高分子溶液; 流体力学的モード

It has so far been believed that polymer systems belong to the same dynamic universality class as classical fluids, nemely, the so-called model H in the Hohenberg-Halperin notation. However, our recent experimental studies strongly indicate that behavior fo polymer solutions can be explained by none of the conventional dynamic universality classes at least in the practical sense. Topological characteristics of polymer chains induces the slow molecular motion of polymer and the viscoelastic effect. The asymmetry in molecular dynamics between polymer and solvent leads to the strong kinetic coupling between the stress field and the order parameter. This causes the viscoelastic suppression of the order parameter fluctuation for equlibrium critical dynamics and unusual phase separation having a viscoelastically driven morphology for unstable states. The relaxational nature of viscoelastic effect violates the selfsimilarity of the growing pattern. A new concept of dynamic symmetry should introduced in addition to the static, composition symmetry.

到目前为止，人们一直认为，聚合物系统属于相同的动态普适类的经典流体，nemely，所谓的H模型在Hohenberg-Halperin符号。然而，我们最近的实验研究强烈表明，聚合物溶液的行为可以解释的传统的动力学普适类，至少在实际意义上。高分子链的拓扑特性导致了高分子的慢运动和粘弹性效应。聚合物和溶剂分子动力学的不对称性导致了应力场和序参量之间的强动力学耦合。这导致了粘弹性抑制的顺序参数波动的equliquidcritical动力学和不寻常的相分离具有粘弹性驱动的形态不稳定状态。粘弹性效应的弛豫性质违反了生长模式的自相似性。在静态对称、构图对称的基础上，引入动态对称的新概念.

项目成果

Hajime Tanaka: "Forced Brillouin Spectroscopy Using Frequency-Tunable Contionuous Wave Lasers" Phys. Rev. Lett.75. 4234-4237 (1995)

Hajime Tanaka：“使用频率可调谐连续波激光器的强制布里渊光谱”物理。

Hajime Tanaka, Tomoo Sigehuzi: "Periodic Spinodal Decomposition in a Binary Polymeric Fluid Mixture" Phys.Rev.Lett.vol.75, No.4. 874-877 (1995)

Hajime Tanaka、Tomoo Sigehuzi：“二元聚合物流体混合物中的周期性旋节线分解”Phys.Rev.Lett.vol.75，No.4。

Hajime Tanaka: "A new Coasening Mechanism of Droplet Spinodal Decomposition" J.Chem.Phys. (Communication). 103. 2361-2364 (1995)

Hajime Tanaka：“液滴旋节分解的新科斯宁机制”J.Chem.Phys。

Tuyoshi Sonehara, Hajime Tanaka: "Forced Brillouin Spectroscpy Using Frequency-Tunable Continuous Wave Lasers" Phys.Rev.Lett.vol.75, No.23. 4234-4237 (1995)

Tuyoshi Sonehara、Hajime Tanaka：“使用频率可调谐连续波激光器的强制布里渊光谱”Phys.Rev.Lett.vol.75，第 23 期。

Hajime Tanaka, Tomoo Sigehuzi: "Spinodal Decomposition of a Symmetric Binary Fluid Mixture in Quasi Two-Dimensions : Local Orientational Ordering of Fluid Tubes" Phys.Rev.E. vol.52, No.1. 829-834 (1995)

Hajime Tanaka、Tomoo Sigehuzi：“准二维对称二元流体混合物的旋节线分解：流体管的局部定向排序”Phys.Rev.E。