Abstract
The determination of the energy of activation (barrier height) of elementary events involved in relaxation (fluctuation) transitions in polymers from the temperature dependence of the specific heat is discussed. The dependence is derived by the method of differential scanning calorimetry. It is emphasized that the correct determination of the energy of activation must include the temperature variation of the barrier. The deviation of the preexponential in the Arrhenius temperature dependence from the value predicted theoretically demonstrates that the barrier does depend on temperature. Experimental data from which the realistic energy of activation of the α relaxation in polymers can be found are given.
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