Summary
Dielectric measurements on a γ-irradiated polycarbonate in a dose range 0–20 Mrad and at test frequencies of 103 and 104 Hz have been carried out. The glass transition temperature shows a maximum at 3.5 Mrad and then decreases at larger doses. This result is in line with other experiments (intrinsic viscosity, dynamic-mechanical measurements, etc) already reported: the Tg values are however larger in the present results. This is probably due to the plasticizing action of the absorbed moisture present in the previous tests. A Tg vs 1/[n]2 plot (1/[n]2 is proportional to 1/m ) allows to find the value of the glass transition point at an infinite molecular weight and the dependency of Tg on molecular weight.
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La Mantia, F.P., Acierno, D. Dielectric behaviour of a γ-irradiated polycarbonate. Polymer Bulletin 2, 331–335 (1980). https://doi.org/10.1007/BF00266710
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DOI: https://doi.org/10.1007/BF00266710