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Macromonomer Chain Growth in the Radical Polymerization of MMA by Cobalt(II) Catalyzed Chain Transfer

✍ Scribed by Yunying Li; Bradford B. Wayland

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
89 KB
Volume
24
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Properties of the radical polymerization of methyl methacrylate in the presence of cobalt(II) tetraphenylporphyrin ((TPP)Co^II^•) as a chain transfer catalyst are reported. Reversible addition of (L)Co‐H to macromonomers gives living character to the oligomer olefins that grow to higher molecular weight without altering the primary polymer structural features. Incorporation of reversible termination of oligomer radicals in the mechanistic model for chain transfer catalysis by (L)Co^II^• complexes is an essential feature of the catalytic chain transfer process.

Average degree of polymerization as a function of monomer conversion for the (TPP)Co^II^• mediated CCT polymerization of MMA in C~6~D~6~ initiated by AIBN at different concentrations of (TPP)Co^II^•.

magnified imageAverage degree of polymerization as a function of monomer conversion for the (TPP)Co^II^• mediated CCT polymerization of MMA in C~6~D~6~ initiated by AIBN at different concentrations of (TPP)Co^II^•.

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