Synthesis of poly(vinyl alcohol) combs via MADIX/RAFT polymerization

被引：78

作者：

Bernard, J ^{[1
]}

Favier, A ^{[1
]}

Davis, TP ^{[1
]}

Barner-Kowollik, C ^{[1
]}

Stenzel, MH ^{[1
]}

机构：

[1] Univ New S Wales, Ctr Adv Macromol Design, Sch Chem Engn & Ind Chem, Sydney, NSW 2052, Australia

来源：

POLYMER | 2006年 / 47卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

RAFT polymerization; combs; poly(vinyl alcohol);

D O I：

10.1016/j.polymer.2005.12.004

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Poly(vinyl acetate) combs have been prepared via macromolecular design via interchange of xanthate (MADIX)/reversible addition-fragmentation chain-transfer (RAFT) polymerization using xanthate functionalized polymer cores. The comb backbones were prepared using well-defined poly(vinyl alcohol) PVA polymers with a degree of polymerization of 20, 100 and 170. respectively. Functionalization with xanthates via R-group or a Z-group approach resulted in the formation of macromolecular MADIX agents. While Z group designed macromolecular xanthate agents appeared to inhibit the polymerization of vinyl acetate (VAc), R group designed macromolecular xanthate agents achieved to mediate efficiently the bulk polymerization of VAc affording PVAc combs. However, the growth of the combs was accompanied at low conversions by the formation of linear polymer chains as a result of the constant initiation (AIBN) and shoulders, which can be attributed to intermolecular coupling reactions. The proportions of single chains and termination products were observed to increase with the degree of polymerization of the macromolecular MADIX agents broadening the molecular weight distribution. As a result of a stable ester link between the branches and the PVA backbone, the branched PVAc architectures were finally hydrolyzed to afford poly(vinyl alcohol) combs. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1073 / 1080

页数：8

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