Abstract

Miscibility in blends of chlorinated polyethylene (CPE) and chlorinated poly(vinyl chloride) (CPVC) has been determined as a function of polymer composition at 170°C. The phase state was determined by differential scanning calorimetry to observe glass transition behavior. Experimental results were analyzed using a first-order mean-field treatment for binary mixtures of random copolymers in which it was assumed that both polymers could be regarded as containing only two randomly disposed repeating units. The miscibility-immiscibility boundary was calculated to provide a best fit of the experimental results and fitted to a segment of an ellipse as predicted by theory. A major result was that mixtures of CPEs and CPVCs with identical chlorine content were found to be immiscible; this effect arises from differences in the microstructures of these polymers.

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