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

Molecules

Emad Yousif²  Ahmed A. Al-Amiery¹  Abdulhadi Kadihum³  Abdul Amir H. Kadhum⁴  Abu Bakar Mohamad⁴ 

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

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

DOI  :  10.3390/molecules201119665

来源: mdpi

【 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 (Φ_cs) 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】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.