MISCIBILITY AND PROPERTIES OF POLY(VINYLCHLORIDE-CO-VINYL ACETATE) AND POLY(STYRENE-CO-ACRYLONITRILE) BLENDS

The miscibility of poly(vinyl chloride-co-vinyl acetate) (VYHH) with p oly(styrene-co-acrylonitrile) (SAN) has been studied in different solv ents. The Gordon-Taylor relationship was extended from use as a predic tive tool for estimating the glass transition temperature (T-g) of the blends to estimate the physical properties of the blends. Observation s of shifts in the T-g of the two phases in phase-separated VYHH/SAN b lends suggested partial miscibility of one polymer in the other. Using FTIR spectroscopy, the presence of specific molecular interactions in miscible blends and their absence in the phase-separated system have been shown. Additional evidence for the presence of specific molecular interactions in miscible VYHH/SAN blends and their absence in the pha se-separated system was obtained using the least-squares analysis meth od.