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