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.

聚合物薄膜吸引了很多关注，作为制造有机组件纳米结构的基本材料。从聚合物科学的角度来看，该研究项目是为了揭示二维聚合物系统（例如聚合物单层和超薄聚合物膜）的基本特性。该项目中的重点如下。1）通过使用能量传递方法在二维单层系统中单个聚合物的链扩展，单个聚合物链的根平均距离在单层系统中成功评估。从能量传递效率的实验价值和二维链的模拟价值的比较中，可以发现，聚合物链在单层中采用了合同的形式，以最大程度地减少自由区域，而无需在表面上不链缠结的情况下。二维平面中的形态。粘度与分子量重量的单位功率成比例，表明在二维系统中，聚合物链几乎没有纠缠，每个链几乎存在。纳秒量表。首次揭示了单层中聚合物段的动态行为，并表明迁移率主要由疏水链的凝聚力支配。