Abstract
The PMI, recrystallized from dry benzene, had m.p. 89-90 °. For the calorimetric investigation we used the diathermal calorimeter described in reference [3]. Some minor changes in design (increase of the power of the heater, improvement in the thermal insulation etc.) enabled the working temperature range to be extended to 370°K. The PMI samples were irradiated in the calorimeter cells by 6°Co y-radiation at a dose rate of 4.5 Mrad]hr, at 77°K. The irradiated cell containing the monomer was transferred to the calorimeter at 77°K and the calorimetric melting curve was recorded at a uniform rate of warming up. After melting of the contents the cell was opened and the yield of polymer was determined gravimetrieally.
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