The measurement of the e+ lifetime in solid monomers during polymerization has been carried out. The mechanism of solid-state polymerization can be analyzed by the measurement of the lifetime of positrons and the amounts of positronium formed. This method was applied to the solid-state polylmerization of acrylamide. It was found from the experiments that the lifetime spectrum changes remarkably in the induction period of polymerization. The decrease in the annihilation rate λ2 was interpreted in terms of the formation of a larger free volume during polymerization. The intensity of the slow component was also observed to decrease in the induction period of polymerization. The accumulation of active species which capture positrons and the decrease in the number of free volumes were suggested as explanations of the phenomena.
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Ito et al. (1971) studied this question.
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