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钼系催化剂催化异戊二烯聚合研究

Chemical Propellants & Polymeric Materials(2010)

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Abstract
以磷酸三丁酯取代的五氯化钼(简称Mo)及间甲酚取代的三异丁基铝(简称Al)为催化剂引发异戊二烯(Ip)聚合,考察了n(Mo):n(Ip)、n(Al):n(Mo)及聚合温度对单体转化率和催化剂效率的影响。采用FTIR和1H-NMR对聚合产物的微观结构进行测试表征,用DSC测定聚合产物的玻璃化转变温度(Tg);结果表明在反应温度为50℃、n(Mo):n(Ip)为4.0×10-4、n(Al):n(Mo)为30、聚合24h所得的聚异戊二烯(PIp)中1,4-结构摩尔分数为55.7%,3,4-结构的为22.5%和1,2-结构的为21.8%,该PIp的Tg为-35.1℃。
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Key words
triisobutyl aluminum,structure characterization,molybdenum series catalyst,coordination polymerization,isoprene
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