Solution blending of poly(vinyl chloride) (PVC) and starch acetate (d.s. 2.5) synthesized in our laboratory was carried out in 1,4-dioxane. The compatibility of these blends based on the heat of mixing and the free-energy concept was examined theoretically. Experimental evidence for the compatibility of these blends was derived from viscometric and ultrasonic studies and density measurements. Interaction parameters suggest that polymer–polymer interaction is greater than polymer–solvent interaction in the blends under study. All the experimental and theoretical evidence show that the blends are incompatible at the compositions studied. Morphological studies showed a uniform dispersion of starch acetate in PVC.
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Thakore et al. (1999) studied this question.
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