Thermodynamics of the interaction of polyvinyl chloride with low-molecular-mass liquids

The changes in the heats of interaction between the components of a model system comprising a low-molecular-mass liquid and PVC were studied as functions of the conditions of polymer synthesis and processing. These conditions determine the peculiarities of the initial PVC structure and the degree of its modification during rolling. To calculate the Gibbs free energy and the entropy of mixing of PVC with THF, we used a theoretical approach based on the UNIQUAK model of a solution. It is concluded that disordering of the structure and a decrease in the packing density of PVC macromolecules occur during rolling. PVC structure plays the main role in changing the thermodynamic parameters of interaction with the solvent