ABSTRACT
Temperature dependence of particle mobility in polymeric medium shares a number of common features of all types of motions tested. Most often, experiments are performed under constant normal pressure. Moreover, the analysis of temperature dependences allows to obtain values of preexponential factors of activation theory formulas and thermodynamic parameters of the transition state theory equation. Activation energies at a constant volume are markedly lower than those at a constant pressure. In the majority of the cases, the activation energy of diffusion grows with the particle size. The slope of this dependence are defined by the structure and shape of the particles. It is seen that coefficients a and b depend on both polymer structure and temperature. Existence of two terms of apparent activation energy is displayed in the fact that a change of particle characteristics does not necessarily lead to a noticeable change of activation parameters of its motion.
