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
Effect of stabilizers in the thermal treatment of PVC—V. Effect of Ba and Cd butyrates, 2-ethylhexoates, laurates and stearates on the dehydrochlorination of PVC
✍ Scribed by E. Czakó; Z. Vymazal; Z. Vymazalová; J. Skalský; J. Štěpek
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 318 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
The behaviours of barium and cadmium soaps of four fatty acids and their combinations in PVC under static thermal stress at 180 ° in air have been studied. In order to compare the effectiveness of these stabilizers, the thermal stabilities calculated on the basis of evolved hydrogen chloride, the amounts of chlorides determined by coulombmetric titration and the degree of discoloration have been discussed.
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Thermal degradation at 180 ° in air of PVC stabilized with an equimolar mixture of Ba and Cd stearates has been studied. The "unreacted" stearates were separated by filtering tetrahydrofuran solutions of samples. The filtration and thermal degradation were examined by means of infrared spectroscopy
Effect of the 2:1 combination of Na and Zn stearates on the stabilization of PVC exposed to thermal stress at 180 ° in air has been studied by i.r. spectrometry (190(~1350cm 1) and by determination of Zn, Na and CI-in the decomposition products of the stearates (NaCI, ZnCI2). Complexation of both co