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Synthesis of telechelic polymers through radical polymerization with a two-component iniferter system

✍ Scribed by Takayuki Otsu; Masahiro Yoshioka; Takayuki Tanaka

Book ID: 103073782
Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 339 KB
Volume: 28
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(92)90271-3

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✦ Synopsis

A two-component iniferter system, consisting of an initiator and a chain transfer agent bearing the same functional group, is proposed for control of the chain-end structure of vinyl polymers. In this paper, 4,4'-azobiscyanovaleric acid (ACVA) and dithiodiglycol acid (DDGA) were used as initiator and chain transfer agent respectively, for polymerizations of some vinyl monomers to synthesize the polymers having a carboxyl group at both chain-ends. In the polymerizations of styrene (St) and vinyl acetate, the proposed two-component iniferter system was found to be effective for the synthesis of the telechelic polymers. On the other hand, the end-structure of the polymers could not be controlled efficiently in polymerizations of butadiene, methyl acrylate and methyl methacrylate; diisopropyl fumarate gave telechelic polymers with ACVA and DDGA. Polycondensation of the resulting telechelic poly(St) with polyethyleneglycol was carried out to obtain a block copolymer.

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