Abstract
A calorimetric method, in which a thermistor was the temperature sensitive element, has been adapted for following the non-stationary states of the polymerization of methyl methacrylate, induced by γ-rays. A polymerization rate dependence on ( dose rate) 1 2 has been found over the approximate range from 0·2 to 20 rad/sec and at temperatures between −25° and 55°. Values of the ratio of the propagation to termination rate constants have been determined in this range of temperatures by following the initial and final non-stationary states, immediately after the irradiation is abruptly started or reduced. Using values of the initiation rates, determined by means of the DPPH inhibition method, the individual values of the rate constants have been obtained. They obey closely the Arrhenius law over the range of temperature investigated.
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