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Propagation and Termination Kinetics of PEGylated Methacrylate Radical Polymerizations

✍ Scribed by Rebekka Siegmann; Aleksandra Jeličić; Sabine Beuermann

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
418 KB
Volume
211
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Propagation and chain‐length averaged termination rate coefficients, k~p~ and <k~t~>, for radical polymerizations of methacrylates carrying poly(ethylene glycol) (PEG) units are reported. k~p~ derived from pulsed laser initiated polymerizations in bulk, in organic solvents, and in ionic liquids follows the methacrylate‐type family behavior. Contrary, diffusion controlled k~t~ values obtained from chemically initiated polymerizations with in‐line FT‐NIR monitoring of monomer conversion are strongly affected by the PEG units in the ester group. Compared to alkyl methacrylates <k~t~> is unexpectedly high. Moreover, <k~t~> of poly(ethylene glycol) ethyl ether methacrylate shows a significant reduction in k~t~ already at 15% conversion, whereas dodecyl methacrylate <k~t~> is constant up to at least 70% conversion.

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