高等学校化学学报2012，Vol.33Issue(1)：199-205,7.DOI:10.3969/j.issn.0251-0790.2012.01.034
PEB/MMA-AN悬浮接枝共聚反应机理
Mechanism of Graft Polymerization of Methyl Methacrylate-Acrylonitrile onto Poly (ethene-co-1-butene)
摘要
Abstract
The effects of reaction time on reaction behavior of suspension grafting copolymerization of methyl methacrylate(MMA)-acrylonitrile( AN) onto poly(ethene-co-l-butene) (PEB) and toughening effect of PEB-g-MAN on SAN resin were investigated. The grafting polymerization product was characterized by GPC and FTTR analysis, the grafting copolymerization mechanism was investigated and the formula of calculating molecular weight of grafted chain was established. The results show that firstly the polymerization is mainly forming non-grafted copolymer with low molecular weight( MANL) of the transferring terminating polymerization of chain propagating free radicals and forming the grafted chains(g-MAN) of the transferring graft polymerization, and then the polymerization is mainly forming non-grafted copolymer with high molecular weight( MANH) of bimolecular terminating polymerization of chain propagating free radicals; molecular weight of MANL is less than that of g-M AN and molecular weight of g-M AN is less than that of MANH; there exist chain scission and random regrafting of the backbone of PEB-g-MAN and ungrafted PEB which result in the production of multi-block polymer of PEB and PEB-g-MAN during the grafting copolymerization; mass fraction of AN unit in grafted chain is close to mass fraction of AN unit in non-grafted copolymer in the initial stage and the former is much less than the later in the later stage.关键词
乙烯-1-丁烯共聚物/接枝共聚反应机理/接枝链分子量/链转移终止/多嵌段共聚物Key words
Poly ( ethene-co-1 -butene)/ Crafting copolymerization mechanism/ Molecular weight of grafted chain/ Transferring terminating/ Multi-block polymer分类
化学化工引用本文复制引用
熊凯,朱勇平,王霞,王炼石,蔡彤曼,张安强,曾祥斌..PEB/MMA-AN悬浮接枝共聚反应机理[J].高等学校化学学报,2012,33(1):199-205,7.基金项目
广州市科技计划重点项目(批准号:2007Z2-D0161)资助. （批准号:2007Z2-D0161）
