Free radical graft polymerization of methyl methacrylate from polyvinyl alcohol using FeCl3/K2S2O5 redox pair

Abstract

Ferric chloride/potassium metabisulfite redox pair initiated free radical polymerization of methyl methacrylate has been carried out in aqueous medium both in presence and absence of polyvinyl alcohol (PVOH). The percentage of homopolymer formation is very low in absence of PVOH. However, the presence of PVOH (0.1%) gives rise to more than 70 % yield of polymethyl methacrylate homopolymer. About 60% graft copolymer (PVOH-g-PMMA) is achieved at 0°C using 1.0 % PVOH. Free radical polymerization (both homopolymer and graft copolymer) is decreased with the increase of temperature. Homopolymer formation and graft co-polymerization have been confirmed by FT-IR studies. A reaction scheme has been proposed to elucidate the role of ferric ion and metabisulfite ion.

Publication Title

Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry

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