聚乙烯与三单体固相接枝物的热分解动力学

Study on the Thermal Decomposition Kinetics of Ternary-Monomer Graft Copolymers of Polyethylene

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-Redfma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。

The ternary-monomer graft copolymers of polyethylene（PETM） was synthesized by the monomer self-dissolved in-situ solid phase graft copolymerization. The Coats-Redfern method and Doyle-Ozawa method were used to study the thermal decomposition kinetics. Results show that the reaction progression of thermal decomposition is between 0 and 1 due to the effect of the grafted side chains. The activation energy of thermal decomposition of PETM is higher than that of PE, indicating that the themal stability of PETM is better than that of PE. The thermal stability of PETM tends to increase with the proportional increase of St among the monomers due to the contribution of St to the stabilization of radicals and therefore to the decrease of decomposition rate of PE.