UNSPECIFIED (1996) Catalytic chain transfer polymerisation (CCTP) of methyl methacrylate: Effect of catalyst structure and reaction conditions on chain transfer coefficient. In: 2nd International Symposium on Free Radical Polymerization - Kinetics and Mechanisms, MAY 26-31, 1996, SANTA MARGHERITA LIGURE, GENOA, ITALY.

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Abstract

Catalytic chain transfer polymerisation of methyl methacrylate has been investigated by a range of cobalt(II) complexes. The effect of catalyst structure, reaction temperature and solvent has been examined. At 60 degrees C in the absence of solvent, the chain transfer coefficient, Cs, for MMA and cobaloximes modified by bridging BF2 groups e.g. 3 is found to be 40,900, this is constant over a wide mass range. Cs is lowered when catalysts of larger cross sectional area are used supporting a diffusion controlled process. Co-ordinating solvents suppress Cs by competing for coordination of the Co(II) effectively reducing the concentration of active species. No conclusions can be drawn regarding the effect of temperature and thus the activation energy of the process. CCTP lowers the observed rate of polymerisation.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	MACROMOLECULAR SYMPOSIA
Publisher:	HUTHIG & WEPF VERLAG
ISSN:	1022-1360
Date:	December 1996
Volume:	111
Number of Pages:	10
Page Range:	pp. 37-46
Publication Status:	Published
Title of Event:	2nd International Symposium on Free Radical Polymerization - Kinetics and Mechanisms
Location of Event:	SANTA MARGHERITA LIGURE, GENOA, ITALY
Date(s) of Event:	MAY 26-31, 1996
URI:	http://wrap.warwick.ac.uk/id/eprint/18107

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