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Study on the dynamics of polymer chains at interfaces

聚合物链界面动力学研究

基本信息

批准号：
11450371
负责人：
NAKAMAE Katsuhiko
金额：
$ 1.47万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450371/
关键词：
Polymer Surface Relaxation Adsorption Molecular movement Dynamics Surface force Polymer brush 界面複合材料誘電率

项目摘要

Structurally-tailored polymers, such as styrene-vinylpyridine diblock copolymer, polystyrene having pendant functional groups were synthesized. These polymers were adsorbed onto the planer surface to prepare a flat surface tethering polymer brushes. In order to gain deeper insights into the forces operated between such surfaces, the thickness and volume fraction of adsorbed polymer layer, distance between adsorbed chains, and the conformation and the mobility of adsorbed chains were studied using dielectric dispersion analyzer, atomic force microscope, ellipsometer, dynamic light scattering detector, and dynamic viscometer. On the other hand, the relaxation of the forces operated between planer surfaces having adsorbed polymer chains were analyzed by the dynamic surface force measurement using surface force apparatus. The dynamic properties of adsorbed polymer were also studied by rheological measurement. The rate-dependence of force relaxation was detected through the dynamic surface force analysis, and the strong adhesive forces were further observed after relaxation of adsorbed chains at confined spaces, likely due to segmental interactions. The dynamic surface force analysis as well as rheological measurement was probed to be a suitable methodology for analyzing hydrodynamic forces and segmental interactions. Based on the results obtained from this study, we attained fundamental understanding of the dynamic behavior of adsorbed polymer chains.

合成了具有悬垂官能团的苯乙烯-乙烯基吡啶二嵌段共聚物、聚苯乙烯等结构定制聚合物。这些聚合物被吸附在刨床表面上，制备了一个平坦的表面拴住聚合物刷。为了更深入地了解这些表面之间的作用力作用，利用介电色散分析仪、原子力显微镜、椭偏仪、动态光散射探测器和动态粘度计研究了吸附聚合物层的厚度和体积分数、吸附链之间的距离以及吸附链的构象和迁移率。另一方面，利用表面力仪进行动态表面力测量，分析了吸附聚合物链的刨床表面间作用力的弛豫。通过流变学测试研究了吸附聚合物的动力学特性。通过动态表面力分析检测了力弛豫的速率依赖性，并进一步观察到吸附链在受限空间松弛后的强附着力，可能是由于片段相互作用。探讨了动态表面力分析和流变测量是分析水动力和段间相互作用的合适方法。基于这项研究的结果，我们对吸附聚合物链的动力学行为有了基本的了解。