Study of Rate-accelerating of Aluminum Hydroxide,Boric Acid,and(2-Methylpropyl)Boronic Acid for Atom Transfer Radical Polymerization of Styrene
Study of Rate-accelerating of Aluminum Hydroxide,Boric Acid,and(2-Methylpropyl)Boronic Acid for Atom Transfer Radical Polymerization of Styrene
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发表时间：
2008
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通讯作者：
Zou You-si
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作者：
Zou You-si
以溴化亚铜（I）/五甲基二乙基三胺（PMDETA）为催化剂，以2-溴丙酸乙酯（EBP）为引发剂，加入催化量的刘易斯酸（LA），如氢氧化铝（AH）、硼酸（BA）、（2-甲基丙基）硼酸（MPBA）作为加速添加剂，在LA存在下，聚合以活性方式进行，由一级动力学曲线表明，结果表明，Mn的加入对聚合反应有明显的促进作用，当Mn的摩尔比为1：5 ~ 1，1：4 ~ 1，1：5 ~ 1时，聚合反应得到了较好的控制，聚合速率得到了明显的提高，特别是，当最佳配比为/（5 ∶ 1）时，苯乙烯的聚合速率显著提高，且在分子量10 000 ~ 100 000范围内保持良好的可控性。
The polymerization of styrene was mediated by copper(I) bromide/pentramethyl diethyl-triamine(PMDETA) using ethyl 2-bromopropionate(EBP) as initiator and a catalytic amount of Lewis acid(LA),such as aluminum hydroxide(AH),boric acid(BA),and(2-methylpropyl)boronic acid(MPBA),as a rate-accelerating additive.The polymerization in the presence of LA proceeded in a living fashion indicated by the first-order kinetic plots,with increase of Mn with respect to conversion and the relatively narrow polydispersities and had a apparent rate-enhancement efficiency.It was found that the polymerization was controlled well and had significant rate enhancements when the molar ratio of /=51,/=41,/=51,respectively.And particularly,the rate of polymerization of styrene with the optimal ratio of /(51) was remarkably enhanced and a good controllability was maintained in the molecular weight from 10 000 to 100 000.