Photodegradation of PVC stabilized by Ba, Ca, Cd and Zn stearates

Films of unplasticized PVC containing Ba, Ca, Cd or Zn stearate at 5 mmol/100 g PVC and prepared by pressing at 190° were exposed to radiation of 300–420 nm wavelength with emission maximum at 345 nm. I.R. spectroscopy and coulometric chloride determinations were employed to monitor changes in the a...

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Bibliographic Details
Published in:European polymer journal 1985, Vol.21 (2), p.151-154
Main Authors: Vymazal, Z., Švorčík, V., Volka, K., Vymazalová, Z.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Physical properties
Polymer industry, paints, wood
Properties and testing
Radiation influence
Technology of polymers
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Summary:Films of unplasticized PVC containing Ba, Ca, Cd or Zn stearate at 5 mmol/100 g PVC and prepared by pressing at 190° were exposed to radiation of 300–420 nm wavelength with emission maximum at 345 nm. I.R. spectroscopy and coulometric chloride determinations were employed to monitor changes in the amounts of stearate, stearic acid, carbonyl groups and chloride ions in the films during photodegradation. The point at which the characteristic absorption maxima of the stearates vanish decreases in the order CdSt2, ZnSt2, BaSt2, CaSt2. HCl is found to split from the polymer and CO groups to form from the beginning of the exposure. The courses of the formation of stearic acid and chloride ions differ for the various stearates. The formation of CO groups is not favoured by the presence of stearates. The increase in the CO group content of the polymer is related to the amount of the chemically unchanged stearate in the mixture.
ISSN:0014-3057
1873-1945
DOI:10.1016/0014-3057(85)90046-1