Polymerization of Methyl Methacrylate by Chitosan-supported Rare Earth Catalysts

Abstract

Abstract: Polymerization of methyl methacrylate (MMA) by chitosan-supported rare earth(Cs.RE)-Al (i-Bu)₃-ε-caprolactone (CL) catalytic system has been investigated.From ki-netics of MMApolymerization and distribution of molecular weights of polymer sample,monomer reactivity ratios and the curve of copolymer composition in copolymerization ofstyrene and MMA, the polymerization of MMAwith the Cs.Y-Al (i-Bu)₃ -CLcatalyst ismost likely to take place via a coordinate anionic mechanism.The microstructure of poly(methyl methacrylate) is determined by IR, DSC, ¹HNMRand ¹³C NMR.Syndiotacticity of PMMA (polymerization at 60℃) is as high as 86.4% and its T^g, is 123.9℃ These resultsdlsclose that chitosan-supported rare earth catalytic system has high stereospecificity.

Key words: Chitosan, Rare earth catalyst, Methyl methacrylate, Styrene, Polymerization

CLC Number:

O632.12

TrendMD:

ZHANG Yi-Feng, ZENG Xian-Biao, SHEN Zhi-Quan. Polymerization of Methyl Methacrylate by Chitosan-supported Rare Earth Catalysts[J]. Chem. J. Chinese Universities, 1997, 18(7): 1202.

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Polymerization of Methyl Methacrylate by Chitosan-supported Rare Earth Catalysts

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