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Confinement effects on the molecular dynamics of polymers with special architectures

特殊结构聚合物分子动力学的限制效应

基本信息

批准号：
18141116
负责人：
Dr. Klaus-Jochen Eichhorn
金额：
--
依托单位：
Leibniz-Institut für Polymerforschung Dresden (IPF)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2006
资助国家：
德国
起止时间：
2005-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/18141116?language=en
关键词：
Confinement effects molecular dynamics polymers

项目摘要

There is a twofold motivation to investigate confinement effects on the molecular dynamics in thin films of polymers having special architectures, i.e. dendritic polymers. Technologically, these materials promise potential applications, a special interest being reported to use them as thin films. Concomitantly, this project is intended to contribute to the basic understanding of the role of the macromolecular architecture in the dynamics of polymeric systems. A special emphasis is put on the investigation of the confinement-induced deviations of the dynamic glass transition from its bulk behaviour. Two aspects are addressed in this respect: (i) what role plays the macromolecular architecture in the dynamics of confined polymers; (ii) to what extent different methods to investigate the glass transition provide comparable results when applied to thin films. Polymeric systems having different branched architectures will be synthesized, modified, characterised and used, further, for the preparation of thin films. Their physical structure and chemical composition, surface morphology, refractive index, surface properties (surface energy and charge, wetting) will be examined in dependence on the film thickness. Complementary measurements by Broadband Dielectric Spectroscopy, dilatometry, AC-calorimetry, spectroscopic ellipsometry and temperature dependent Fourier Transform Infra-red Spectroscopy (FTIR) will be carried-out to investigate the confinement effects on the dynamics of hyperbranched polymers in thin films.

有一个双重的动机，以调查限制在具有特殊结构的聚合物，即树枝状聚合物的薄膜中的分子动力学的影响。从技术上讲，这些材料具有潜在的应用前景，据报道，将它们用作薄膜特别有趣。同时，这个项目的目的是有助于基本了解的作用，大分子结构的动态聚合物系统。一个特别强调的是把调查的约束引起的偏差的动态玻璃化转变从其散装行为。在这方面，解决了两个方面：（一）什么样的作用起着大分子结构中的动态约束聚合物;（二）在何种程度上不同的方法来研究玻璃化转变提供了可比的结果时，应用到薄膜。具有不同支化结构的聚合物体系将被合成、改性、表征并进一步用于制备薄膜。它们的物理结构和化学组成、表面形态、折射率、表面性质（表面能和电荷、润湿性）将根据膜厚度进行检查。通过宽带介电谱、介电常数测量、交流量热法、椭圆偏振光谱和温度相关傅里叶变换红外光谱（FTIR）进行补充测量，以研究限制对薄膜中超支化聚合物动力学的影响。