Abstract
An ESR study on the radical polymerization of methyl methacrylate and its homologs was carried out in frozen aromatic solvents, using benzoyl peroxide as a photosensitizer. A well-resolved 9-line spectrum was observed and its intensity distribution was found to change with temperature and the medium. In order to elucidate the origin of the 9 lines, deuterated methyl methacrylates and triphenylmethyl methacrylate having a bulky ester group were used. A 4-line spectrum (1:3:3:1) was observed for methyl methacrylate-β-d2 (MMA-β-d2). A 3-line spectrum, whose intensity distribution was not binomial, was recorded for methyl-d3 methacrylate (MMA-d3). A 5-line spectrum (1:4:6:4:1) was recorded for triphenylmethyl methacrylate. The temperature dependence of these spectra was also investigated. It was concluded from these results that the two conformations of the propagating radicals are responsible for the 9-line spectrum of methyl methacrylate in glassy aromatic solvents.
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Kamachi, M., Kohno, M., Liaw, D. et al. ESR Study of the Propagating Radical in the Polymerization of MMA in Frozen State. Polym J 10, 69–75 (1978). https://doi.org/10.1295/polymj.10.69
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DOI: https://doi.org/10.1295/polymj.10.69