Study on the dynamics of polymer chains at interfaces

点击翻译按钮获取中文摘要

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.