Abstract
Abstract Increasing the fraction of styrene-acrylonitrile (SAN) in blends with PVC results in a higher dehydrochlorination of the latter at 180°C in air. The adverse effect of SAN, or the acrylonitrile groups, in a PVC/SAN blend (50/50) can be eliminated by stabilization with a liquid organotin sulphur-type stabilizer. The use of a solid organotin stabilizer limits the applicability of differential scanning calorimetry (DSC) to the determination of the T g value of PVC and/or SAN as a procedure suitable for quantitation of the stabilizer in the polymers constituting the immiscible PVC/SAN (50/50) blend.
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