The treatment of the model concerning the thermal degradation of PVC based upon the probability theory has been performed with the assumption of particular polymer sequences. The treatment has been extended to both the case of no limitations being made to the values of the rate constants and the case simplified by the assumption β ≫ α. In the case of the simplified model the probability-theoretical treatment has led to the same results as the kinetic treatment. Besides approaching the problem with the aid of other methods, the application of the probability theory permits calculation of the extent of elimination also at arbitrary values of the rate constants. © 1969.
