Study on the dynamics of polymer chains at interfaces

合成了具有侧链官能团的苯乙烯-乙烯基吡啶两嵌段共聚物、聚苯乙烯等结构剪裁的聚合物。将这些聚合物吸附到平面上，制备了平整表面的系链聚合物刷子。利用介电色散分析仪、原子力显微镜、椭偏仪、动态光散射仪和动态粘度计研究了吸附聚合物层的厚度和体积分数、吸附链间的距离以及吸附链条的构象和迁移率，以更深入地了解聚合物表面之间的作用力。另一方面，利用表面力仪进行动态表面力测量，分析了吸附了高分子链的平面之间作用力的松弛。通过流变学测试，研究了吸附聚合物的动态特性。通过动态表面力分析检测到了力松弛的速率依赖性，在受限空间吸附链松弛后，进一步观察到了较强的粘附力，这可能是由于链段相互作用所致。动态表面力分析和流变学测量是分析水动力和节段相互作用的一种合适的方法。基于本研究的结果，我们对吸附高分子链的动力学行为有了基本的了解。

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.