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The temperature dependence of the monomer reactivity ratios in the copolymerizations of styrene with halostyrenes

✍ Scribed by C.A. Barson; D.K. Burns

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 190 KB
Volume: 14
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(78)90036-8

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✦ Synopsis

Styrene (M1) has been copolymerized with 0-, m-and p-halostyrenes (M2) at temperatures between 40 and ll0~C, using azoisobutyronitrile as initiator; the halostyrenes were labelled with 14C in the fl-position. The compositions of the copolymers were determined by liquid scintillation counting.

Since [M~] ~> [M2]

, a simplified form of the copolymer composition equation was used to determine reactivity ratios r~ ; account was taken of the isotope effect resulting from the labelling in the fl-position, Arrhenius parameters of r t were found; they show that polar effects predominate in determining the magnitude of r r Steric effects, which counteract the polar effects, are small.

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