Derivation of Statistical Principle: Explaining the Heating Rate Dependence of Degradation Temperature of Ziegler-Natta Poly(styrene).

A simple statistical principle of chemical degradation system was derived by using isotactic poly(styrene). From a single TG-DTA curve, Tm (melting) and Td (degradation temperature) were obtained. These values were traced under different heating rates (20-0.6oC/min). The results were summarized as a function of heating time in a semi-logarithmic scale (Figure 3). It is indicated that a shaded area of the figures was almost constant irrespective of the heating rate employed (Figure 4), wh ich was directly connected with the thermal energy (dQ*) to cause the macroscopic thermal degradation. [ABSTRACT FROM AUTHOR]