Effect of stabilizers in the thermal treatment of PVC—VIII. An investigation of double bonds in PVC in the presence of Ba and Cd stearates |
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| Authors: | Z Vymazal E Czakó K Volka J Štěpek R Lukáš M Kolínsky K Bouchal |
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| Institution: | 1. Department of Polymers, Technical University, 166 28 Prague 6, Czechoslovakia;2. Department of Analytical Chemistry, Technical University, 166 28 Prague 6, Czechoslovakia;3. Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6, Czechoslovakia |
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| 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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