Viscoelastic, Spectroscopic and Microscopic Study of the Photo Irradiation Effect on the Stability of PVC in the Presence of Sulfamethoxazole Schiff’s Bases
| Autor: | Ali H. Jawad Al-Taie, Gamal A. El-Hiti, Emad Yousif, Zainab Hussain |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
photochemistry Polymers and Plastics Base (chemistry) Quantum yield photostabilizer General Chemistry Polyene UV-Vis spectroscopy PVC sulphamethoxazoles UV absorber Vinyl chloride lcsh:QD241-441 chemistry.chemical_compound Ultraviolet visible spectroscopy lcsh:Organic chemistry chemistry Polymer chemistry Molar mass distribution Tetrahydrofuran Derivative (chemistry) |
| Zdroj: | Polymers Volume 7 Issue 11 Pages 2190-2204 Polymers; Volume 7; Issue 11; Pages: 2190-2204 Polymers, Vol 7, Iss 11, Pp 2190-2204 (2015) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym7111508 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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