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Solvent Influence on Propagation Kinetics in Radical Polymerizations Studied by Pulsed Laser Initiated Polymerizations

✍ Scribed by Sabine Beuermann

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 542 KB
Volume: 30
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.200900131

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✦ Synopsis

Abstract

The influence of the reaction medium (organic solvents, water, ionic liquids, supercritical CO~2~) on the propagation rate in radical polymerizations has very different causes, e.g., hindered rotational modes, hydrogen bonding or electron pair donor/acceptor interactions. Depending on the origin of the solvent influence propagation rate coefficients, k~p~, may be enhanced by up to an order of magnitude associated with changes in the pre‐exponential or the activation energy of k~p~. In contrast, non‐specific interactions, size and steric effects lead to rather small changes in the vicinity of the radical chain end and are reflected by modest variations in k~p~.

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