According to the solubility of the graft copolymer of starch and Acrylonitrile in dimethyl sulfoxide it was inferred that in the graft copolymer there was cross-linking bond initiated by Mn 3+ ,and that the cross-linking bond was formed with the coupled reaction of graft copolymer free radicals.
通过淀粉丙烯腈接枝共聚物（ＳＰＡＮ）在二甲亚砜（ＤＭＳＯ）溶剂中溶解度变化情况推断，Ｍｎ３＋引发下，淀粉与丙烯腈接枝共聚反应生成的ＳＰＡＮ分子中存在有交联键，且这种交联键是由接枝共聚反应过程中共聚物自由基偶合反应形成的。
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