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A Novel Approach for Investigation of Chain Transfer Events by Pulsed Laser Polymerization

✍ Scribed by Anatoly N. Nikitin; Robin A. Hutchinson; Michael Buback; Pascal Hesse

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
497 KB
Volume
212
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Pulsed laser polymerization (PLP) with subsequent analysis of molecular mass distribution (MMD) is used to determine the rate coefficient of chain transfer to an agent A, k~trA~, by varying pulse repetition rate such that the contributions of PLP‐induced and chain‐transfer‐induced peaks to the MMD change to a significant extent. It is shown by simulation that the relative heights of these peaks may be used to estimate k~trA~. The method is applied to evaluation of the rate coefficient of chain transfer to dodecyl mercaptan with butyl methacrylate polymerizations at −11, 0, 20 and 40 °C. The Arrhenius parameters for this coefficient are determined to be: A(k~trA~) = (2.2 ± 0.6) × 10^6^ L · mol^−1^ · s^−1^ and E~a~(k~trA~) = (22.1 ± 0.7) kJ · mol^−1^. magnified image

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