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Living/controlled radical autopolymerization of styrene in the presence of CuCl2 and 2,2 '-bipyridine

机译:在CuCl2和2,2'-联吡啶存在下苯乙烯的活性/受控自由基自聚合

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The bulk autopolymerization of styrene (St) was successfully conducted in the presence of CuCl2 and 2,2'-bipyridine (bpy) at 110 and 130degreesC. We found that this polymerization was a living/controlled radical polymerization at a [St](0)/[CuCl2](0)/[bpy](0) ratio of 54:1:2.5. The resulting number-average molecular weights linearly increased with conversion, and the polyclispersity indices were very narrow (<1.5). The polymerization rate increased with temperature. Increasing the ratios (i.e., 129:1:2.5, 259:1:2.5, and 386:1:2.5) led to a decrease in the ability to control the autopolymerization of St, even uncontrolled polymerization (i.e., 643:1:2.5). The analysis of end groups by H-1-NMR indicated that the spontaneous generation of radicals from St were generated by a Mayo-type process, and this living/controlled radical polymerization might have underwent a reverse atom-transfer radical polymerization process. (C) 2003 Wiley Periodicals, Inc. [References: 42]
机译:在CuCl2和2,2'-联吡啶(bpy)的存在下,在110和130℃下成功进行了苯乙烯(St)的本体自聚合反应。我们发现该聚合为[St](0)/ [CuCl2](0)/ [bpy](0)比为54:1:2.5的活性/受控自由基聚合。所得的数均分子量随转化率线性增加,多峰指数非常窄(<1.5)。聚合速率随温度增加。增加比率(即129:1:2.5、259:1:2.5和386:1:2.5)会导致控制St的自聚合甚至是不受控制的聚合(即643:1:2.5)的能力降低。 )。通过H-1-NMR对端基的分析表明,St的自由基是通过Mayo型过程自发产生的,并且该活性/受控自由基聚合可能已经经历了反向原子转移自由基聚合过程。 (C)2003 Wiley Periodicals,Inc. [参考:42]

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