Abstract
AbstractThe role of radical species in the degradation of poly(methyl methacrylate) (PMMA) induced by γ‐irradiation has been studied by means of electron spin resonance and electron spin echo spectroscopy. The major radical species generated initially at 77 K are assigned to main chain CH and side chain COOCH2 radicals, and COOCH anion radical. Only the COOCH2 radical converts to the scission‐type CH2 C(CH3)COOCH3 radical on warming the sample of >180 K. A part of the CH radical disappears on warming the sample of >265 K. It is concluded that the scission of PMMA main chain occurs by the intramolecular process from the COOCH2 radical as the precursor state.
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