A study of the strength and relaxation properties of compositions based on polyalkanimide

The mechanical relaxational properties of cast materials based on the original and glass-filled polyalkanimide are studied. Temperature regions are observed in which the relaxation process parameters are weakly dependent on temperature, and also in which there is an anomalous decrease in the rate of the relaxation process with rise in temperature on approximating to the softening point. The given relaxation changes are compared with the results of analysis by the DSC method, which provides a means of explaining the anomalous course of the relaxations in terms of recrystallization processes. As a result, the optimum reprocessing conditions are found. The stress relaxation curves are approximated with the aid of new relaxation kernels, based on an analysis of the entropy changes during relaxation. Correlations coefficients close to unity are obtained.