Micro-theology and relaxation phenomena in T-g vicinity

The present paper describes possible forms of relaxation phenomena in T-g v icinity. The individual types of relaxation in amorphous matrix are describ ed in the areas of Vogel's temperature, T-g and crossover temperature. Spec ial emphasis is laid on the difference between Flory's relaxation mechanism and the approach by Di Marzio, Adams and Gibbs. These authors used the com mon formula of Flory, however, their interpretations of the so-called "conf igurational phenomena" reflect completely different realities. The theoreti cal justification of heat capacity as a complex number (recently introduced by Hutchinson, Monserrat and Schawe in T-g vicinity) is provided in detail and compared with the existing experimental evidence quoted by the authors of these contributions as well as with data published in literature. The r elation between complex heat capacity and relaxation of internal stress in amorphous matrixes or the effects of ageing are discussed.