碘代丁烷存在下的甲基丙烯酸甲酯自由基聚合反应

THE RADIACAL POLYMERIZATION OF METHYL METHACRYLATE IN THE PRESENCE OF BUTYL IODIDE

研究了碘代丁烷（１－碘丁烷、２－碘丁烷和碘代叔丁烷）存在下甲基丙烯酸甲酯在６０℃、以丁酮或甲苯为溶剂的自由基聚合。结果表明，１－碘丁烷和２－碘丁烷对ＭＭＡ的聚合无明显影响。而碘代叔丁烷对ＭＭＡ聚合速率和分子量均有影响：以丁酮为溶剂时，碘代叔丁烷起链转移剂作用；以甲苯为溶剂时，碘代叔丁烷既是链转移剂又是链终止剂。

おhe radical polymerizaation of methyl methacrylate (MMA) in the presence of iodobutane in butanone or toluene at 60℃ was studied.The results show that in the presence of 1iodobutane or 2iodobutane the polymerization of MMA exhibits no obvious different from that of no any iodobutane.In the presence of tbutyl iodid,however,the molecular weight of PMMA obtained as well as the polymerization of MMA will be affected remarkably.In butanone,the tbutyl iodid plays a role as a chain terminator.However,but in toluene the tbutyl iodid inhibits the roles of chain transfer agent as well as chain terminator.