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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

E.S.R. Spectra of Free Radicals Relevant to Methacrylate Polymerization

HH Keah, ID Rae and DG Hawthorne

Australian Journal of Chemistry 45(4) 659 - 669
Published: 1992

Abstract

Carbon-based free radicals were generated by thermal cleavage of the tetraester

Me2C(COOME)-CH2-CMe( COOMe )- CMe ( COOMe )-CH2-C( COOMe )Me2

which is a model for head-to-head units in a poly(methyl methacrylate ) chain. The resulting electron spin resonance spectrum had higher resolution than the 'nine-line' spectrum previously reported; this enabled identification of the component radicals. In the present case, the spectrum was well matched by a summation of spectra of the

Me2C(COOME)-CH2-CMe( COOMe )

radical and the 1-methoxycarbonyl-1-methylethyl radical

Me2-C-COOMe

derived from it by loss of methyl methacrylate. Both of these radicals were generated in separate experiments. Radicals were also generated from starting materials containing a CD3 group in place of the single CH3.

https://doi.org/10.1071/CH9920659

© CSIRO 1992

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