Record number :
1725658
Title of article :
Synthesis of poly(vinyl alcohol) combs via MADIX/RAFT polymerization
Author/Authors :
Bernard، نويسنده , , Julien and Favier، نويسنده , , Arnaud and Davis، نويسنده , , Thomas P. and Barner-Kowollik، نويسنده , , Christopher and Stenzel، نويسنده , , Martina H.، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2006
Pages :
8
From page :
1073
To page :
1080
Abstract :
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.
Keywords :
RAFT polymerization , Combs , Poly(vinyl alcohol)
Journal title :
Polymer
Serial Year :
2006
Link To Document :
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