Polymers 2015, 7(11), 2190-2204; doi:10.3390/polym7111508
Viscoelastic, Spectroscopic and Microscopic Study of the Photo Irradiation Effect on the Stability of PVC in the Presence of Sulfamethoxazole Schiff’s Bases
1
Department of Chemistry, College of Science, Al-Nahrain University, Baghdad 64021, Iraq
2
Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia
3
Department of Chemistry, College of Science, Misan University, Misan 62001, Iraq
4
Department of Chemistry, College of Science for Women, Baghdad University, Baghdad 64021, Iraq
*
Authors to whom correspondence should be addressed.
Academic Editor: Yue Zhao
Received: 24 July 2015 / Revised: 12 September 2015 / Accepted: 26 October 2015 / Published: 2 November 2015
Abstract
The photostabilization of poly(vinyl chloride) (PVC) films having five Schiff’s bases derived from sulphamethoxazole has been investigated. The casting method was used to produce PVC films containing sulphamethoxazoles (0.5% by weight), in tetrahydrofuran. The photostabilization activities of five additives were determined by monitoring the hydroxyl, polyene and carbonyl indices with irradiation time. In addition, the quantum yield of the chain scission (Φcs) and the changes in viscosity average molecular weight of PVC films containing Schiff’s basses were evaluated with irradiation time. The rate of photostabilization for PVC films in the presence of five Schiff’s base additives was found to be the highest in the case of 2-hydroxybenzylidene derivative and the lowest in the unsubstituted benzylidene derivative. Several mechanisms have been suggested to explain the photostabilization of PVC in the presence of Schiff’s bases that mainly act as UV absorbers and radical scavengers for photostabilizers. View Full-TextKeywords:
photostabilizer; photochemistry; UV-Vis spectroscopy; PVC; sulphamethoxazoles; UV absorber
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Yousif, E.; El-Hiti, G.A.; Hussain, Z.; Altaie, A. Viscoelastic, Spectroscopic and Microscopic Study of the Photo Irradiation Effect on the Stability of PVC in the Presence of Sulfamethoxazole Schiff’s Bases. Polymers 2015, 7, 2190-2204.
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