可交联PVC的合成及其交联反应

Synthesis and Crosslinking Reaction of Crosslinkable PVC

N，N-二乙基二硫代氨基甲酸钠（铜试剂，简称NaSR）取代PVC链中的部分氯原子，制得不同官能度的功能高分子PVC-SR．在热的作用下，实现了PVC-SR的自交联和PVC-SR／NBR共混体系的共交联．研究了温度、铜试剂用量对取代反应的影响及PVC-SR官能度对交联反应硫化曲线、产物的凝胶含量、玻璃化温度、拉伸性能和压缩永久变形的影响，并初步探讨了交联反应机理.

PVC─SR was prepared from the reaction of PVC and sodium N, N-di-ethyldithiocarbamate. Products of self-crosslinked PVC─SR and co─crosslinked PVC─SR/NBR blend were obtained under heating. Effects of temperature and weight of sodium N,N-diethyldithiocarbamate on substitution reaction and degree of functionality of PVC─SR on the gel content, tensile properties and compress set of crosslinked products were investigated. Mechanism of crosslinking reaction was discussed.