Mechanism of Graft Polymerization of Methyl Methacrylate-Acrylonitrile onto Poly(ethene-co-1-butene)

doi:10.3969/j.issn.0251-0790.2012.01.034

Abstract

Abstract: The effects of reaction time on reaction behavior of suspension grafting copolymerization of methyl methacrylate(MMA)-acrylonitrile(AN) onto poly(ethene-co-1-butene)(PEB) and toughening effect of PEB-g-MAN on SAN resin were investigated. The grafting polymerization product was characterized by GPC and FTIR 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(MAN_L) 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(MAN_H) of bimolecular terminating polymerization of chain propagating free radicals; molecular weight of MAN_L is less than that of g-MAN and molecular weight of g-MAN is less than that of MAN_H; 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.

Key words: Poly(ethene-co-1-butene), Grafting copolymerization mechanism, Molecular weight of grafted chain, Transferring terminating, Multi-block polymer

CLC Number:

O632
TQ334.2

TrendMD:

XIONG Kai, ZHU Yong-Ping, WANG Xia, WANG Lian-Shi, CAI Tong-Min, ZHANG An-Qiang, ZENG Xiang-Bin. Mechanism of Graft Polymerization of Methyl Methacrylate-Acrylonitrile onto Poly(ethene-co-1-butene)[J]. Chem. J. Chinese Universities, 2012, 33(01): 199.

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