Journal of Physical Studies 1(2), 217–224 (1997) DOI: https://doi.org/10.30970/jps.01.217 STUCTURAL CHARACTERISTICS AND ANHARMONIC EFFECTS IN POLYVINYLCHLORIDE COMPOSITIONS, MODIFIED WITH POLYVINYLBUTIRAL

N. Bordjuk, S. Ivanishchuk, B. Kolupaev
Rivne Pedagogical Institute,31 Ostafova Str., Rivne, UA-266000, Ukraine

A correlation determining the harmonic and anharmonic constants of elasticity of PVC macromolecules and its compositions structural elements have been obtained on the basis of the Grunasene equation.

The comparison of their values with those received through considering the macromolecule model as a linear chain has been fulfilled. The solution of secular equation has made it possible to calculate the quasielastic constants and the oscillation frequency of polymeric systems structural elements. The comparison of the quasielastic constants values, received on the basis of such approaches shows them to be of the same order of magnitude. A comprehensive study of the volume, thermo–physical and acoustic properties of heterogeneous systems has allowed to determine the Grunasene parameter and relative extension, which corresponds to the limit of the composition forced elasticity. The use of Lennard–Johns potential has enabled us to determine the structural elements interaction energy and rigidity of macromolecules and their formations.

Taking into account that polymer–polymeric system can be considered as a three-component one, where the boundary layer is a separate component, the calculation of its viscoelastic and acoustic properties has been carried out. The interaction energy of macromolecules structural elements, which are in the boundary layer, has been defined. It was shown that the Grunasene parameter, structural characteristics, rigidity of macromolecules of the boundary layer are different from the corresponding characteristics of the polymer matrix.

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