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Reactivity ratios in group transfer copolymerization of methyl methacrylate/ethyl methacrylate and methacrylonitrile/methyl methacrylate systems obtained by semi-integral and integral methods

✍ Scribed by Huceste Çatalgil-Giz

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
261 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The monomer reactivity ratios for the methyl methacrylate/ethyl methacrylate (MMA/EMA) and methacrylonitrile/methyl methacrylate (MAN/MMA) systems are calculated by linearized semi‐integral and nonlinear fully integral methods. For the MMA/EMA system, r~MMA~ values obtained by various methods are between 1.24 and 1.25 and r~EMA~ values between 0.30 and 0.34. For MAN/MMA system, r~MAN~ values are between 3.2 and 3.8 and for r~MMA~ an upper bound can be determined, i.e., r~MMA~<0.05. The results show that previous values obtained by the linearized method (the initial Kelen‐Tüdős method) overestimate the reactivity of the less active monomer.

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Non-uniqueness in determination of terminal and penultimate model reactivity ratios in the styrene-methyl methacrylate free-radical copolymerization system
✍ Andrzej Kaim; Paweł Oracz 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 593 KB

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