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Polymer Science in Quasi-Two-Dimensional Systems-Analysis of Internal Structures of Polymer Ultra-thin Films with Molecular Dimensions

准二维体系中的高分子科学-分子尺寸高分子超薄膜内部结构分析

基本信息

批准号：
09450360
负责人：
ITO Shinzaburo
金额：
$ 9.02万
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：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450360/
关键词：
Ultra-thin Films Polymer Two-dimensions Fluorescence Probe Spectroscopy Surface Molecular Morphology Molecular Motion 光プロセス 2次元

项目摘要

Polymer thin films has attracted much attention as a basic material for fabricating nanometric structures of organic assemblies. This research project has been performed in order to reveal fundamental properties of two-dimensional polymer systems such as polymer monolayer and ultra-thin polymer films from a view of polymer science. The issues focused in this project were listed as follows.1) Chain expansion of a single polymer in two-dimensional monolayer systems By using the energy transfer method, the root square mean distance of a single polymer chain was successfully evaluated in a monolayer system. From the comparison of the experimental value of energy transfer efficiency and the simulated value for two-dimensional chains, it was revealed that the polymer chains took contracted forms in the monolayer in order to minimize free area without chain entanglement at the surface.2) Chain conformation and entanglement in two-dimensional systems Molecular weight dependence of the shear viscosity for the air/water interfacial monolayers was investigated to elucidate chain morphology in the two-dimensional plane. The viscosity was proportional to the unit power of the molecular weight, indicating that there exists little entanglement of the polymer chains and each chain is segregated in the two-dimensional system.3) Structural relaxation mechanism and dynamics in monolayersThe microscopic motion of polymer chain in a monolayer was examined by time-resolved fluorescence depolarization method, and the rotational relaxation times were evaluated in a nanosecond scale. The dynamic behavior of polymer segment in the monolayer was revealed for the first time and indicated that the mobility is predominantly governed by the cohesive force of hydrophobic chains.

聚合物薄膜作为一种制备纳米有机组件结构的基础材料受到了广泛的关注。本研究项目是为了从聚合物科学的角度揭示二维聚合物体系的基本性质，如聚合物单层和超薄聚合物薄膜。本项目重点关注的问题如下：1)二维单层体系中单个聚合物的链展利用能量传递法，成功地求出了单层体系中单个聚合物链的平均距离的平方根。通过对二维链能量传递效率的实验值与模拟值的比较，揭示了聚合物链在单层中采取收缩形式，以尽量减少表面的自由面积而不产生链缠结。研究了空气/水界面单分子层剪切粘度对分子量的依赖关系，以阐明二维平面上的链形态。黏度与分子质量的单位幂成正比，表明聚合物链之间几乎没有缠结，且每条链在二维体系中是分离的。3)单分子膜结构弛豫机制和动力学：采用时间分辨荧光去极化法研究了聚合物链在单分子膜中的微观运动，并在纳秒尺度上对聚合物链的旋转弛豫时间进行了评价。首次揭示了聚合物在单层中的动态行为，并表明其迁移率主要由疏水链的内聚力决定。