采用单体自增溶原位固相接枝法合成了聚乙烯与三单体固相接枝物(PETM).采用Coats-Redfern法和Doyle-Ozawa法研究了接枝物的热分解动力学.研究表明,受接枝支链的影响,PETM的热分解反应级数介于0~1之间.PETM的热分解活化能比PE高,说明PETM的热稳定性优于PE,随着St在支链中的比例增加,PETM的热稳定性有逐渐增加的趋势,这是由于St能稳定自由基,从而降低PE的热分解速率.
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