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Propagation Rate Coefficient and Fraction of Mid-Chain Radicals for Acrylic Acid Polymerization in Aqueous Solution

✍ Scribed by Michael Buback; Pascal Hesse; Igor Lacík

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
201 KB
Volume
28
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

In acrylate polymerizations both SPRs and tertiary MCRs occur. Via pulsed laser polymerization, using a wide range of LPRRs, in conjunction with aqueous‐phase size‐exclusion chromatography, the polymerization of 1.35 mol · L^−1^ acrylic acid in aqueous solution has been investigated at 6 °C. The sigmoidal decrease in the apparent propagation rate coefficient, k, towards lower LPRRs is in line with recent predictions. At the highest LPRRs, k approaches the rate coefficient of SPR propagation, k, whereas the limiting value of k at low LPRRs approaches the effective propagation rate coefficient, k, which allows for an estimate of the fraction of MCRs under polymerization conditions, x^MCR^.

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