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

✍ Scribed by Z. Vymazal; V. Švorčík; K. Volka; Z. Vymazalová

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
323 KB
Volume
21
Category
Article
ISSN
0014-3057

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✦ Synopsis

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 CdSt 2, ZnSt2, BaSt 2, CaSt 2. HC1 is found to split from the polymer and CO groups to form from the beginning of the exposure. The courses of the formation of steafic 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.

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