关键词: 低密度聚乙烯, 硅烷, 接枝, 自交联, 结晶动力学

Abstract: Crosslinked PE-LD was prepared through a two-step method: silane grafting and room temperature self-crosslinking. Both grafted and crosslinked PE-LD was studied using FTIR and differential scanning calorimeter. It was found that the crystallization behavior of PE-LD was greatly affected by the silane grafted reaction and self-crosslinking, the values of Avrami index of PE-LD was 2.52, while it increased to 3.8～6.0 when PE-LD was grafted or cross-linked. The values of Avrami index increased to the maximum and then decreased with increasing loading of initiator, while decreased with increasing loading of catalyst. Compared with neat PE-LD, the velocity constant of the crystallization of silane grafted PE-LD became higher, while that of cross-linked PE-LD became smaller.

Key words: low-density polyethylene, silane, grafting, self-crosslinking, crystallization kinetics