synopsisThe melting point of polyacrylonitrile can be determined directly by differential ther-The experimental The disparity mal analysis, provided that a sufficiently fast heating rate is used. value of 326°C agrees well with predicted values of the melting point. between oxidative and thermal decomposition of the polymer is noted.
synopsisA series of flexible plasticized poly(viny1 chloride) (YVC) compositions containing different organotin compounds and ultraviolet absorbers has been exposed for 4.5 years at four outdoor sites in Australia with widely differing climatic conditions. Loss of plasticizer by evaporation during the exposure was measured and an empirical correlation was found with the average daily maximum temperature at each site. The relative effectiveness of the organotin compounds and ultraviolet absorbers in preventing deterioration of the PVC was estimated by measuring the viscosity of the polymer after exposure.This method of assessment is compared with the results of mechanical tests on the specimens.
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