抽提蒸馏过程中苯乙烯聚合机理的研究

通过GCMS和FT-ICR MS方法分析了苯乙烯聚合物中低聚物及高聚物的组成和结构，讨论了抽提蒸馏过程中苯乙烯聚合的机理。研究结果表明：在抽提蒸馏过程中引起苯乙烯聚合的机理有自由基引发和热引发两种，其中热引发的几率较大；在链引发阶段，1,3,5-三苯基环己烷参与了生成乙苯基自由基的反应，而且抽提原料中的乙苯也参与了苯乙烯聚合的链转移反应。

STUDY ON STYRENE POLYMERIZATION MECHANISM IN EXTRACTION DISTILLATION PROCESS

Through analyzing the composition and structure of both oligomers and polymers of styrene by GCMS and FT-ICR MS methods, a mechanism of styrene polymerization occurred in the extraction distillation process was proposed. It is concluded that the styrene polymerization is triggered along the radical initiation and thermal initiation with the latter one as a dominate way. It is found that 1,3,5-triphenylcyclohexane is participated in the chain initiation reaction and that the ethylbenzene in extraction feedstock is involved in the chain transfer reaction of styrene polymerization, resulting in more ethyl phenyl free radicals in the system.