SORPTION AND DIFFUSION OF LOW-MOLECULAR-M ASS COMPOUNDS IN POLY-BETA-HYDROXYBUTYRATE

Sorption-diffusive characteristics of the system poly-beta-hydroxybuty rate-sorbate were studied. The impurities in the polymer affect the su permolecular structure of the polymeric matrix, causing the sorption c apacity for water and thermal stability to change. Analysis in terms o f the theory of regular solutions revealed a correlation between the s olubility of the sorbate in poly-beta-hydrobutyrate and the parameters of solubility. Relationships between the diffusion coefficients and c oncentration of the penetrant in the matrix were obtained. The values of the diffusion coefficients extrapolated to the zero concentration d epend on the nature of the solvent and increase in a series benzen con gruent-to ethanol < hexane < acetone.