Termination kinetics of methyl methacrylate free-radical polymerization studied by time-resolved pulsed laser experiments

Buback, M. & Kowollik, C. (1998) Termination kinetics of methyl methacrylate free-radical polymerization studied by time-resolved pulsed laser experiments. Macromolecules, 31(10).

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Abstract

The SP-PLP technique has been applied to measure kt/kp, the ratio of termination to propagation rate coefficients, for the free-radical bulk polymerization of methyl methacrylate at 1000 bar and several temperatures ranging from 40 to 100 °C. kt/kp is obtained from time resolved (μS) near-infrared measurement of monomer conversion induced by a single laser pulse of about 20 ns width. A total of 80 such single pulse (SP) signals were co-added to yield a concentration vs time trace of sufficient signal-to-noise quality to deduce kt/kp with an accuracy of better than ±40%. With kp being known from the well-established PLP-SEC procedure, kt/kp data directly yield individual (chain-length averaged) termination rate coefficients, referring to a fairly narrow range of monomer conversion. The SP-PLP technique, which seemed to be restricted to investigations into high kp monomers such as ethene (at high temperatures) and the acrylates, within the present work on MMA is demonstrated to be suitable for kinetic studies on slowly propagating monomers, too.

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54 citations in Web of Science®
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ID Code: 99035
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :52
Export Date: 20 September 2016
CODEN: MAMOB
Correspondence Address: Buback, M.; Inst. für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, D-37077 Göttingen, Germany
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Keywords: Free radical polymerization, Molecular structure, Monomers, Pulsed laser applications, Reaction kinetics, Pulsed laser polymerization, Termination kinetics, Polymethyl methacrylates
ISSN: 00249297
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 22 Sep 2016 04:50
Last Modified: 22 Sep 2016 04:50

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