Living cationic polymerization of isobutyl vinyl ether by protonic acid/ zinc halide initiating systems : evidence for the halogen exchange with zinc halide in the growing species
Living cationic polymerization of isobutyl vinyl ether by protonic acid/ zinc halide initiating systems : evidence for the halogen exchange with zinc halide in the growing species
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DOI：
10.1021/ma00036a004
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发表时间：
1992-05
期刊：
影响因子：
5.5
通讯作者：
M. Kamigaito;M. Sawamoto;T. Higashimura
中科院分区：
文献类型：
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作者：
M. Kamigaito;M. Sawamoto;T. Higashimura
HB/ZnX2(B=I，Cl，OCOCF3，X=I，Br，Cl)引发体系对IBVE的活性阳离子聚合速率依次降低。HI/ZNi2>；HI/ZCl2≃HCl/ZNi2≃HCl/ZNi2&Gt；HCl/ZNi2&Gt；&Gt；CF3CO2H/ZCl2。聚合物的相对分子质量Mn与单体转化率成正比，与假设每个Hb分子形成一条高分子链的计算值符合得很好。作为模型反应，对HB-IVBE加合物与ZnX2的一系列混合物进行了1H核磁共振分析。结果表明，活性物种(Cδ+…Bδ-…Zx2)至少部分是离子的
The rate of living cationic polymerization of IBVE by HB/ZnX 2 (B=I, Cl, OCOCF 3 , X=I, Br, Cl) initiating systems decreased in the order. HI/ZnI 2 >HI/ZnCl 2 ≃HCl/ZnI 2 ≃HCl/ZnBr 2 >HCl/ZnCl 2 >>CF 3 CO 2 H/ZnCl 2 .The molecular weight M n of the polymers was directly proportional to monomer conversion and in good agreement with the calculated value assuming that one polymer chain forms per HB molecule. As model reactions, a series of mixtures of the HB-IVBE adduct and ZnX 2 were directly analyzed by 1 H NMR. The results shoswed that the activated species (C δ+ ...B δ- ...ZnX 2 ) is at least partly ionic