FEATURES OF MODELLING THE KINETICS OF EXTRACTION OF PLASTICISERS FROM POLYVINYL CHLORIDE

摘要

Extraction of the plasticiser from PVC leads to a change in the properties of the polymer and to environmental pollution. An effective method for monitoring the change in the properties of PVC and the content of plasticiser in the environment is to model the kinetics of extraction of the ingredient. Use is made of empirical models obtained by processing experimental results from investigating the kinetics of desorption of plasticisers from PVC. A feature of the process of desorption of the plasticiser from PVC is the glass transition of the polymer on achievement of a certain residual content of the ingredient. The task of determining the glass transition conditions of PVC was addressed. The investigation of the kinetics of extraction was conducted using dioctyl phthalate, (DOP). The residual concentrations of DOP in PVC during glass transition of the polymer under conditions of extraction and evaporation of the ingredient are presented. The results make it possible to calculate the rate of extraction of DOP with examined liquids of different temperature from PVC films of different thicknesses. However, the dependence of the coefficients of the empirical model on the nature of the liquid limits its applicability only to the liquids examined in the present work. 10 refs. (Article translated from Plasticheskie Massy, No.2, 2005, p.42-3)