关键词: 原子力显微镜(AFM), 紫外引发接枝, 微结构, 引发

Abstract: The microstructure of grafted polymer chains has a significant effect on the final properties of the grafted polymer, however, there is still not a direct method to characterize the microstructure of grafted chains. The microstructure of the grafted chains formed in the initial stage of the UV-initiated photografting of glycidyl methacrylate(GMA) onto high-density polyethylene(HDPE) surface and the initiation rate of the surface photografting reaction were studied with tapping mode atomic force microscopy(AFM). The grafted materials with granular structures were found on HDPE surface after 30 s UV irradiation, after that, the number and the volume of the granules increased with the increase of irradiation time. The granule was thought to be a single grafted chain with a highly branched(or superbranched) microstructure. The grafting density on HDPE increased almost linearly with the increase of irradiation time in the range of 30—45 s, and the increasing rate of grafting density became slower after 45 s. The initiation rate of surface photografting was about 6.5 Unit/(μm²·s) in the range of 30—45 s.

Key words: Atomic force microscopy(AFM), UV initiated grafting, Microstructure, Initiation