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Time-Resolved Electron Spin Resonance Spectroscopy of Radicals Formed During Free Radical Polymerizations of Alkyl Acrylates

✍ Scribed by Atsushi Kajiwara

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
251 KB
Volume
30
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Time‐resolved electron spin resonance (TR ESR) spectra allows direct observation of transient radicals (primary propagating radicals) obtained by the addition reaction of a diphenylphosphinoyl radical to acrylates. The addition rate constants (k~2~) of the diphenylphosphinoyl radical to the acrylates (initiation rate constants) were determined by the monomer concentration dependence of the decay rate of the diphenylphosphinoyl radical. The value of k~2~ was 1.9 × 10^7^ s^−1^ · M^−1^ for the case of t‐butyl acrylate, while the k~2~ values of ethyl, n‐butyl, 2‐ethylhexyl, and dodecyl acrylates were about 1 × 10^7^ s^−1^ · M^−1^. A combination of steady state ESR and TR ESR provided information on the kinetics both of initiation and propagation processes in the radical polymerization of acrylates.

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