Abstract
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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
