Irradiated single crystals of methacrylamide were studied by electron spin resonance. Irradiations were made at 77 and 288°K. and measurements were made at 77, 193, and 293°K. Only chemical changes explain these spectra. The original scission is CC breakage between (CONH2) and CH2C(CH3), and CH breakage between CH2C‐(CONH2)CH2 and H; these small fragments react with methacrylamide and finally produce two free radicals at room temperature. These two free radicals are the ones which propagate or terminate the polymerization. The free radical transformation at the last period of polymerization is concluded to be:
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Hisashi Ueda (1964) studied this question.
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