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Glass transition temperature of methyl methacrylate-ethyl ?-benzoyloxymethylacrylate copolymers

✍ Scribed by Fern�ndez-Garc�a, M; Cuervo-Rodriguez, R; Madruga, E?L

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
96 KB
Volume
49
Category
Article
ISSN
0959-8103

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✦ Synopsis

Poly(ethyl a-benzoyloxymethylacrylate) (EBMA) and copolymers of methyl methacrylate (MMA) with EBMA have been prepared by free radical polymerization. Monomer precursors of ethyl a-benzoyloxymethylacrylate have likewise been polymerized. Glass transition temperatures (T g ) of homo and copolymers have been determined by differential scanning calorimetry. The Johnston equation, which considers the in¯uence of monomeric unit distribution on the copolymer glass transition temperature, has been used to explain the T g behaviour. T g12 has been calculated by the application of the Johnston equation, which gave a value markedly lower than the average value expected from the additive contribution of the T g of the corresponding homopolymers.

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