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Reaction temperature profiles and radical concentration measurements on batch emulsion copolymerizations of methyl-methacrylate and butyl acrylate.

Cutting, Graham R. and Tabner, Brian J. (1995) Reaction temperature profiles and radical concentration measurements on batch emulsion copolymerizations of methyl-methacrylate and butyl acrylate. European polymer Journal, 31 (12). pp. 1215-1219. ISSN 0014-3057

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Abstract

Electron spin resonance (ESR) spectroscopy has been employed to monitor the occluded radical concentration during the batch (unseeded) emulsion copolymerization of methyl methacrylate and butyl acrylate. Occluded radical concentrations, above the detection limit of the ESR spectrometer, are only observed at methyl methacrylate mole fractions >0.96. The occluded radicals reach a maximum concentration at high conversion (ca 95%) and thereafter their concentraion declines via a second order termination process. The variation in the maximum reaction temperature and the time at which this maximum occurs with mole fraction has also been monitored and is discussed. The most surprising feature of these latter observations is that the rate of polymerization is much faster for butyl acrylate than for methyl methacrylate despite the greater propagation rate constant of the latter.

Item Type: Article
Journal or Publication Title: European polymer Journal
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22251
Deposited By: ep_ss_importer
Deposited On: 06 Feb 2009 16:20
Refereed?: No
Published?: Published
Last Modified: 26 Jul 2012 15:58
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22251

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