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氯磺化聚乙烯水解后是一种性能特异的离子交换膜。本文研究了低密度及高密度聚乙烯中空纤维氯磺化反应时间与交换容量之间的关系,并用红外光谱及广角X射线衍射法测定了氯磺化反应对聚乙烯晶体结构的影响。结果表明,氯磺化反应主要发生在聚乙烯的非晶区,最大交换容量及反应速度均与非晶区含量有关。反应对晶粒表面也有一定程度的侵蚀作用,随着交换容量的增加,结晶度下降,晶粒度减小。低密度及高密度聚乙烯的变化趋势相似,但前者比后者变化更显著。
Chlorosulfonated polyethylene hydrolysis is a performance-specific ion exchange membrane. The relationship between chlorosulfonation reaction time and exchange capacity of low density and high density polyethylene hollow fibers was studied in this paper. The effect of chlorosulfonation on the crystal structure of polyethylene was also investigated by FTIR and wide angle X-ray diffraction. The results show that the chlorosulfonation mainly occurs in the amorphous region of polyethylene. The maximum exchange capacity and reaction rate are related to the amorphous content. The reaction also has a certain degree of erosion on the grain surface. As the exchange capacity increases, the crystallinity decreases and the grain size decreases. The trend of low-density and high-density polyethylene is similar, but the former is more significant than the latter.