Catalytic chain transfer polymerisation (CCTP) of methyl methacrylate: Effect of catalyst structure and reaction conditions on chain transfer coefficient.
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, SANTA MARGHERITA LIGURE, GENOA, ITALY, MAY 26-31, 1996. Published in: MACROMOLECULAR SYMPOSIA, 111 pp. 37-46.Full text not available from this repository.
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|
|Official Date:||December 1996|
|Number of Pages:||10|
|Page Range:||pp. 37-46|
|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|
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