铈盐作用下甲基丙烯酸甲酯在壳聚糖模型化合物上接枝聚合机理研究

MECHANISM OF GRAFT COPOLYMERIZATION OF METHYL METHACRYLATE ONTO MODEL COMPOUND FOR CHITOSAN INITIATED BY Ce4+ION

铈盐作用下甲基丙烯酸甲酯在壳聚糖模型化合物上接枝聚合机理研究张国栋冯新德（北京大学高分子科学与工程系北京１００８７１关键词壳聚糖，接枝共聚合，硝酸铈胺，接枝机理甲壳素是自然界中产量仅次于纤维素的一种多糖，而壳聚糖是其２位碳上乙酰氨基的乙酰基部分...

Mechanism of graft copolymerization of methyl methacrylate onto model compound for chitosan with Ce4+ ion was investigated by means of kinetics measurement and oxidation product analysis in addtion to polymer molecule weight analysis. The kinetic feature and product structure analysis of Ce4+ oxidation of model compound for chitosan showed that chelate complex at adjacent hydroxylamine functional group was involved and then disproportionated to radical. The results from GPC suggested that one adjacent hydroxylamine group formed the sole initial radical at 40℃ or two initial radicals at 90℃.