Fundamental Studies on the Phase Transitions in Polymer Mixture Systems.

聚合物混合物体系相变的基础研究。

• 批准号: 63470090
• 负责人: HASHIMOTO Takeji
• 金额: $ 3.52万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63470090/
• 关键词: Polymer Mixture; Spinodal Decomposition; Phase Transition; Block Copolymer; Shear Flow; Microphase Separation; Pattern Formation; 高分子混合系(ブレンド); ポリマ-アロイ; (ミクロ)ドメイン構造; 相分解; 時分割光散乱法; ポリマーブレンド; 相図; 相分離機構; スピノーダル

This research project consists of three sub-projects. The result of each sub-project is given bellow :1. Self-Assembly in Spinodal Decomposition of Polymer Mixtures.We studied the time evolution of the concentration fluctuation of the component molecules and the domain structures (patterns) during the spinodal decomposition of PB/SBR and PP/EPR mixtures and clarified the mechanism and the dynamics of pattern formation at the early, middle and late stages of the spinodal decomposition processes.2. Phase Transitions and Self-Assembly of Polymer Solutions and Polymer Mixtures under Shear Flow.This is totally new field of researches in non-equilibrium statistical mechanics. We found the phenomenon of homogenization of polymer A/polymer B/solvent system induced by simple shear flow and many interesting patterns under steady-state shear flow. We also found that polymer mixture systems are much more sensitive to the flow field than small molecule systems, which is attributed to the extremely long "characteristic time' and "characteristic length" of the polymer systems.3. Phase Transitions and Self-Assembly in Block Copolymers and Block Copolymer/Homopolymer Mixtures.We presented the scattering function from the disordered state of the star block copolymers with various arm numbers, and showed the arm-number dependence on the phase transition (order-disorder transition). We also showed the variety of the patterns created by the interplay of two kinds of phase transitions, macrophase transition and microphase transition, coexisting in a mixture system of block copolymer and homopolymer.

本研究项目由三个子项目组成。每个子课题的研究结果如下：1.聚合物共混物调节分解的自组装：研究了PB/SBR和PP/EPR共混物调节分解过程中组分分子浓度涨落和微区结构(图样)的时间演化，阐明了调节分解早期、中期和后期的图样形成机理和动力学。聚合物溶液和聚合物混合物在剪切流作用下的相变和自组装，这是非平衡统计力学研究的一个全新领域。我们发现了简单剪切流动引起的聚合物A/聚合物B/溶剂体系的均化现象，以及在稳态剪切流动下的许多有趣的模式。我们还发现，聚合物混合体系比小分子体系对流场更加敏感，这归因于聚合物体系极长的特征时间和特征长度。在嵌段共聚物和嵌段共聚/均聚物混合物中的相变和自组装。我们从不同臂数的星形嵌段共聚物的无序态出发，给出了散射函数，并给出了相变(有序-无序转变)与臂数的关系。我们还展示了在嵌段共聚物和均聚物的混合体系中共存的两种相变--宏观相变和微观相变--相互作用所产生的花样的多样性。

项目成果

T.Hashimoto,T.Izumitani and M.Takenaka: "Homogenization of Immiscible Rubber/Rubber Mixtures by Uniaxial Compression" Macromoleules. 22. 2293-2302 (1989)

T.Hashimoto、T.Izumitani 和 M.Takenaka：“通过单轴压缩实现不混溶橡胶/橡胶混合物的均质化”大分子。

T.Hashimoto,H.Tanaka and N.Iizuka: "Phase Transition of Block Copolymer/Homopolymer Mixtures,in "Space-Time Organization in Macromolecular Fluids",F.Tanaka,M.Doi and T.Ohta,Eds." Springer Series in Chemical Physics,Springer-Verlag Berlin,Heidelberg. 51. 2

T.Hashimoto、H.Tanaka 和 N.Iizuka：“嵌段共聚物/均聚物混合物的相变，在“高分子流体中的时空组织”中，F.Tanaka、M.Doi 和 T.Ohta，Eds。”

S. Koizumi, H. Hasegawa and T. Hashimoto: "Mutual Diffusion of Block Polymer and Homopolymer. Visualization Using Microdomain as a Probe" Macromolecules. 23. 2955-5962 (1990)

S. Koizumi、H. Hasekawa 和 T. Hashimoto：“嵌段聚合物和均聚物的相互扩散。使用微域作为探针的可视化”大分子。

M. Takenaka, K. Tanaka and T. Hashimoto: "Mechanism and Dynamics of Ordering Process of Polymer Blends at Phase Transition" "Multiphase Macromolecular Systems". Plenum. 363-384 (1989)

M. Takenaka、K. Tanaka 和 T. Hashimoto：“相变聚合物共混物有序过程的机制和动力学”“多相高分子系统”。

T.Hashimoto;et al.: Polymer Communications. 30. 45-47 (1989)

T.Hashimoto 等人：聚合物通讯。