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Kinetic studies of the copolymerisation of styrene and fluoro-α-methylstyrenes

✍ Scribed by C.A. Barson; D.R. Fenn

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
182 KB
Volume
24
Category
Article
ISSN
0014-3057

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✦ Synopsis

Styrene (Mi) has been copolymerised with 14C-labelled fluoro-~-methylstyrenes (M2) in the temperature range 40-105 °, under conditions where [M~]>>[M2]. Arrhenius plots of the values of the reactivity ratio r, indicate that, in the case of 2-fluoro-ct-methylstyrene, the introduction of fluorine considerably reduces monomer activity towards the polystyryl radical compared with ~t-methylstyrene;

both enthalpies and entropies of activation contribute to the reduced activity. In the case of 4-fluoro-~t-methylstyrene, the effect of the fluorine substituent is insignificant. Since neither of the fluoro<t-methylstyrenes homopolymerises, these comonomers do not show the ceiling temperature effects observed with ~t-methylstyrene.

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