β Scribed by Lev I. Kalontarov
No coin nor oath required. For personal study only.
Comparative analysis of stationary and nonstationary regimes of laser-induced polymer reactions is carried out. Non-Arrhenius kinetics for thermochemical transformations of polymers is experimentally found under nonstationary conditions. A model for the non-Arrhenius behavior is proposed, which includes temperature dependence of the activation energy of the nonstationary reaction. A possible mechanism for this temperature dependence is also considered, which takes into account that in the nonstationary regime the "chemical" degree of freedom is a rapid variable and the "thermal" one is a slow variable.
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A new kinetic model was developed to describe the thermal degradation behavior of polymers. The model was applied to predict the degradation of poly(methyl methacrylate) (PMMA) blended with propyl ester phosphazene (FR). The results showed that the thermal degradation mechanism of pure PMMA was domi