Abstract
AbstractThe thermal degradation of poly(vinyl chloride) (PVC) has been studied by differential scanning calorimetry (DSC). Due to crosslinking, the glass transition temperature (Tg) of PVC raises during the degradation. The thermal degradation of PVC has also been studied for heterogeneous 1:1 (w/w) blends of PVC with polystyrene (PC), poly(styrene‐co‐acrylonitrile) (SAN), high‐impact PS (poly(styrene‐g‐butadiene)) (HIPS) and poly(SAN‐g‐butadiene) (ABS). Tg of the PVC phase raises slower during degradation in the PVC/PS‐blend, whereas in the other blends the crosslinking is accelerated, due to a negative influence of the double bonds and/or the nitrile groups on the thermal stability of PVC. Since most methods use the determination of eliminated HCl to study the degradation of PVC, the DSC method is very useful in investigations on PVC‐containing polymer blends, if there might be a reaction of HCl with one of the blend components.
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