Abstract
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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