Abstract
Thermal degradation of PVC at 180° in air in the presence of Ba and Cd sterarates and of their combination has been studied. In the presence of Cd stearate, dehydrochlorination proceeds at many sites giving rise to relatively short polyenes. In the presence of Ba stearate, the number of degradation sites is smaller, but long polyene sequences are formed, causing the colouration of the polymer. In synergistic combinations of Ba/Cd stearates, both these mechanisms may operate.
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