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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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 |
|---|---|
| Publication: | Macromolecules |
| Publisher: | American chemical society |
| 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.ac.in/id/eprint/37365 |
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