Gel permeation chromatography in the study of the molecular weight distribution vinyl chloride–vinyl acetate copolymer. III. Influence of the incompatibility of polymers and some problems of interpretation of experimental data

The influence of incompatibility in the ternary systems gel–polymer–solvent and polymer–polymer–solvent on the results of gel permeation chromatography of the copolymer vinyl chloride–vinyl acetate was investigated. The measurements were performed on styrene–divinylbenzene gels and on porous silica gels. Detection in GPC was made using a differential refractometer together with a UV detector, which permitted evaluation of the extent of interactions of the polymer components in the mixture. Some aspects of the GPC data are discussed for the application of universal calibration, the validity of which for the copolymer vinyl chloride–vinyl acetate has been proved.