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首页> 外文期刊>Journal of Applied Polymer Science >A Novel Polymer Chain Growing Mode and Styrene Copolymer Prepared with Low Molecular Weight Copolymer of alpha-Methylstyrene and Styrene as Macroinitiator
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A Novel Polymer Chain Growing Mode and Styrene Copolymer Prepared with Low Molecular Weight Copolymer of alpha-Methylstyrene and Styrene as Macroinitiator

机译：以低分子量α-甲基苯乙烯和苯乙烯为大分子引发剂制备的新型聚合物链增长方式和苯乙烯共聚物

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摘要

A new polymer chain growth mode, having multiple potential chain propagation sites, initiated by oligomer of alpha-methylstyrene (AMS) and styrene (St) (PAS) is presented in this article. The effects of PAS content, AMS fraction in PAS and reaction temperature on bulk polymerization of St have been investigated. It is demonstrated that the PAS performed as macroinitiator in the polymerization of St. The average molecular weights of products increase significantly with the evolution of the polymerization, which is different from conventional free radical polymerization. With 20 wt % macroinitiator, the molecular weights increase from 1.21 x 10(5) to 3.00 x 10(5) with the monomer conversion increasing from 15.3 to 83.0%. This unique feature is tentatively attributed to both the reversible polymerization-depolymerization of AMS segments at high temperature which could generate more than one propagation sites in a polymer chain and the combination termination of St free radical polymerization. (C) 2014 Wiley Periodicals, Inc.
机译：本文提出了一种新的聚合物链增长模式，该模式具有多个潜在的链增长位点，由α-甲基苯乙烯（AMS）和苯乙烯（St）（PAS）的低聚物引发。研究了PAS含量，PAS中AMS含量和反应温度对St本体聚合的影响。证明了PAS在St的聚合反应中作为大分子引发剂起作用。产物的平均分子量随聚合反应的进行而显着增加，这不同于常规的自由基聚合反应。使用20wt％的大分子引发剂，分子量从1.21×10（5）增加到3.00×10（5），而单体转化率从15.3％增加到83.0％。该独特的特征暂时归因于在高温下AMS链段的可逆聚合-解聚，其可在聚合物链中产生多个传播位点，以及St自由基聚合的组合终止。 （C）2014威利期刊公司

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