THERMODYNAMICS OF POLYVINYL-CHLORIDE INTE RACTION WITH LOW-MOLECULAR LIQUIDS

The changes in heats of components interaction for the model system of low-molecular liquid-PVC were studied as functions of conditions of s ynthesis and processing of the polymer. These conditions determine the peculiarities of the initial PVC structure and the degree of its modi fication after rolling. To calculate Gibbs free energy and mixing entr opy for PVC samples with THF we used a theoretical approach based on U NIQUAK model of solution. A conclusion is made that disordering of the structure and decrease in packing density of PVC macromolecules occur after passing through rolls. PVC structure plays a main role in chang e of thermodynamic parameters of interaction with the solvent.