硅烷自然交联聚乙烯热降解研究

Research on thermal degradation of silane naturally cross-linked polyethylene

对一种一步法硅烷自然交联聚乙烯材料(SCPE419)在自然交联过程中不同时段的热降解行为进行了研究,采用Kissinger动力学处理方法研究其热降解动力学。结果表明:随着自然交联时间的延长,最大热降解速率温度和表观活化能呈逐渐升高的趋势,初始降解温度先降低后升高。该结果说明交联聚乙烯材料中残余少量的引发剂会造成初始降解温度降低,随着网状分子结构的逐渐形成,热稳定性逐渐提高。

The thermal degradation behavior during the naturally cross-linking process at different time intervals of silane naturally cross-linked polyethylene material（SCPE419） prepared by one-step method was investigated. Its thermal degradation kinetics was investigated by using Kissinger kinetic treatment method. The results show that the temperature at the maximum thermal degradation rate and the apparent activation energy exhibit gradually increasing tendency with the extension of naturally cross-linking time, the initial degradation temperature firstly decreases and then increases. The results show that the residual trace amount of initiator in the cross-linked polyethylene material can decrease the initial degradation temperature, the thermal stability increases gradually with gradually forming of network-like molecular structure.