Abstract
Powdered poly (phenyl methacrylate), synthesized by free-radical bulk polymerization, has been irradiated to doses, between 200 kGy and 600 kGy, of cobalt-60 γ-rays under an argon atmosphere. A G (scission) value of 1·8 has been calculated from the changes in number-average molecular weight as determined by gel permeation chromatography. Energies of activation for the decomposition of irradiated polymers have been calculated from the results of thermogravimetric experiments.
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