Radiation‐induced bulk polymerization of maleimide in both solid and liquid states was studied. Benzoquinone inhibited the liquid‐state polymerization and retarded solid‐state polymerization. The results of ESR study showed that solid monomer irradiated at 61°C. gave a spectrum, the concentration of which slowly decreased without changing the shape at 61°C. The radical detected at 61°C. was shown not to be the main propagating species. Overall rate polymerizations in the liquid and solid states were expressed, respectively, by first‐order and zero‐order rate equations with respect to the concentration of monomer. The overall rate constants in liquid and solid states were proportional to I0.9 and I1.0, respectively.
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Kagiya et al. (1967) studied this question.
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