Synthesis of poly(vinyl acetate)- b-poly(dimethylsiloxane)- b-poly(vinyl acetate) triblock copolymers by iodine transfer polymerization

Iodine transfer polymerization of vinyl acetate in bulk, initiated by α,α′-azobisisobutyronitrile at 80 °C, has been successfully performed in the presence of an α,ω-diiodo-poly(dimethylsiloxane) macrotransfer agent. The formation of a triblock copolymer PVAc- b-PDMS- b-PVAc has been proved by 1H NM...

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Bibliographic Details
Published in:European polymer journal 2008-02, Vol.44 (2), p.318-328
Main Authors: Tonnar, Jeff, Pouget, Emmanuel, Lacroix-Desmazes, Patrick, Boutevin, Bernard
Format: Article
Language:English
Subjects:
Applied sciences
Block copolymer
Chemical Sciences
Controlled radical polymerization
Exact sciences and technology
Inorganic and organomineral polymers
Iodine transfer polymerization
Physicochemistry of polymers
Poly(dimethylsiloxane)
Polymers
Preparation
Vinyl acetate
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Summary:Iodine transfer polymerization of vinyl acetate in bulk, initiated by α,α′-azobisisobutyronitrile at 80 °C, has been successfully performed in the presence of an α,ω-diiodo-poly(dimethylsiloxane) macrotransfer agent. The formation of a triblock copolymer PVAc- b-PDMS- b-PVAc has been proved by 1H NMR and size exclusion chromatography analyses. The analysis of the chain-ends has been performed using 1H NMR. It was found that a large amount of inverse chain-ends is present at the end of the polymerization. Moreover, the formation of several other side products by degradation of the functional chain-ends has been evidenced.
ISSN:0014-3057
1873-1945
DOI:10.1016/j.eurpolymj.2007.11.026