Study on Cross-linking degree of Polyethylene

摘要

In this paper, the linear low density polyethylene (LLDPE) was melted and cross-linked by dicumyl peroxide (DCP) used to prepare cross-linked polyethylene (XPE). The gel content was determined by extraction method. The effect of content of cross-linker, cross-linked time, cross-linked temperature and other factors on the gel content were studied. It was found that the extraction time should be 18 h for XPE. The gel content increased with the increasing of cross-linked time. When the cross-linked time was 10-15 min, DCP was almost complete decomposition. The gel content was basically stable when the cross-linked temperature was 170-175°C. The maximum of gel fraction was about 90%.