Journal article

E.S.R. Spectra of free radicals relevant to methacrylate polymerization

H Hong Keah, ID Rae

Australian Journal of Chemistry | Published : 1992


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 ge..

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