Photostabilizing Efficiency of PVC in the Presence of Schiff Bases as Photostabilizers
Emad Yousif 1
, Ahmed A. Al-Amiery 2,3,*, Abdulhadi Kadihum 4, Abdul Amir H. Kadhum 3 and Abu Bakar Mohamad 3,5
, Ahmed A. Al-Amiery 2,3,*, Abdulhadi Kadihum 4, Abdul Amir H. Kadhum 3 and Abu Bakar Mohamad 3,5
1
Department of Chemistry, College of Science, Al-Nahrain University, Baghdad 10072, Iraq
2
Environmental Research Center, University of Technology (UOT), Baghdad 10001, Iraq
3
Department of Chemical & Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia
4
Department of Laser and Optoelectronics, University of Technology (UOT), Baghdad 10001, Iraq
5
Fuel Cell Institute, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editor: Kei Saito
Molecules 2015, 20(11), 19886-19899; https://doi.org/10.3390/molecules201119665
Received: 18 August 2015 / Revised: 4 October 2015 / Accepted: 8 October 2015 / Published: 4 November 2015
(This article belongs to the Section Photochemistry)
Abstract
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. View Full-TextKeywords:
photochemistry; polyvinyl chloride (PVC); photostabilizer; UV absorber; UV-Vis spectroscopy
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Yousif, E.; Al-Amiery, A.A.; Kadihum, A.; Kadhum, A.A.H.; Mohamad, A.B. Photostabilizing Efficiency of PVC in the Presence of Schiff Bases as Photostabilizers. Molecules 2015, 20, 19886-19899.
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