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Microstructure of copolyperoxides of alpha-methylstyrene with styrene and methyl methacrylate

Jayanthi, S and Kishore, K (1996) Microstructure of copolyperoxides of alpha-methylstyrene with styrene and methyl methacrylate. In: Macromolecules, 29 (14). pp. 4846-4852.

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Abstract

This paper reports a study on the microstructure of two series of copolyperoxides of alpha-methylstyrene, with styrene and with methylmethacrylate. The copolyperoxides were synthesized by the free radical-initiated oxidative copolymerization of the vinyl monomer pairs. The copolyperoxide compositions obtained from the H-1 and C-13 NMR spectra led to the determination of the reactivity ratios. The product of the reactivity ratios indicates that alpha-methylstyrene forms a block copolyperoxide with styrene and a random copolyperoxide with methylmethacrylate. Microstructural parameters like average sequence length, run number, etc. have been determined for the latter copolyperoxide from analysis of its C-13 NMR spectrum. The aromatic quaternary and carbonyl carbons were found to be sensitive to triad sequences. The end groups of the copolyperoxides have been identified by H-1 NMR as well as FTIR spectroscopic techniques. The thermal degradation of the copolyperoxides has been studied by differential scanning calorimetry, which confirms the alternating peroxide units in the copolyperoxide chain.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Chemical Society.
Keywords: Styrene(alpha-methyl) copolymer;Methyl methacrylate copolymer;Peroxide copolymer;Radical copolymerization; Reactivity ratio;Microstructure;Sequence distribution; End group;Experimental study;Molecular structure;
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 05 May 2011 04:22
Last Modified: 05 May 2011 04:22
URI: http://eprints.iisc.ernet.in/id/eprint/37365

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