Photostabilizing Efficiency of PVC in the Presence of Schiff Bases as Photostabilizers

Molecules

Abdul Amir H. Kadhum¹  Abu Bakar Mohamad¹  Emad Yousif²  Abdulhadi Kadihum³  Ahmed A. Al-Amiery⁴ 

[1] Department of Chemical & Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia;Department of Chemistry, College of Science, Al-Nahrain University, Baghdad 10072, Iraq;Department of Laser and Optoelectronics, University of Technology (UOT), Baghdad 10001, Iraq;Environmental Research Center, University of Technology (UOT), Baghdad 10001, Iraq;

关键词: photochemistry;    polyvinyl chloride (PVC);    photostabilizer;    UV absorber;    UV-Vis spectroscopy;   

DOI  :  10.3390/molecules201119665

来源: DOAJ

【 摘 要 】

The photostabilization of polyvinyl chloride (PVC) films by Schiff bases was investigated. Polyvinyl chloride films containing 0.5 wt % Schiff bases were produced using the same casting method as that used for additive-free PVC films from tetrahydrofuran (THF) solvent. The photostabilization activities of these compounds were determined by monitoring the carbonyl, polyene and hydroxyl indices with irradiation time. The changes in viscosity average molecular weight of PVC with irradiation time were also monitored using THF as a solvent. The quantum yield of chain scission (Φcs) for the studied complexes in PVC was estimated to range between 4.72 and 8.99 × 10−8. According to the experimental results, several mechanisms were suggested, depending on the structure of the additive. Ultra violet (UV) absorption, peroxide decomposition and radical scavenging were suggested as the photostabilizing mechanisms.

【 授权许可】

Unknown