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Molecules 2017, 22(9), 1506; doi:10.3390/molecules22091506

New Tetra-Schiff Bases as Efficient Photostabilizers for Poly(vinyl chloride)

1
Department of Chemistry, College of Science, Tikrit University, Tikrit 34001, Iraq
2
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, Al-Nahrain University, Baghdad 64021, Iraq
4
Polymer Research Unit, College of Science, Al-Mustansiriyah University, Baghdad 10052, Iraq
*
Authors to whom correspondence should be addressed.
Received: 8 August 2017 / Revised: 5 September 2017 / Accepted: 6 September 2017 / Published: 9 September 2017
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Abstract

Three new tetra-Schiff bases were synthesized and characterized to be used as photostabilizers for poly(vinyl chloride) (PVC) films. The photostability of PVC films (40 μm thickness) in the presence of Schiff bases (0.5 wt %) upon irradiation (300 h) with a UV light (λmax = 365 nm and light intensity = 6.43 × 10−9 ein∙dm−3∙s−1) was examined using various spectroscopic measurements and surface morphology analysis. The changes in various functional groups’ indices, weight and viscosity average molecular weight of PVC films were monitored against irradiation time. The additives used showed photostability for PVC films, with Schiff base 1 being the most effective additive upon irradiation, followed by 2 and 3. The atomic force microscopy (AFM) images for the PVC surface containing Schiff base 1 after irradiation were found to be smooth, with a roughness factor (Rq) of 36.8, compared to 132.2 for the PVC (blank). Several possible mechanisms that explain PVC photostabilization upon irradiation in the presence of tetra-Schiff bases were proposed. View Full-Text
Keywords: poly(vinyl chloride); Schiff bases; functional group’s indices; atomic force microscopy; photodegradation; irradiation; viscosity average molecular weight poly(vinyl chloride); Schiff bases; functional group’s indices; atomic force microscopy; photodegradation; irradiation; viscosity average molecular weight
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ahmed, D.S.; El-Hiti, G.A.; Hameed, A.S.; Yousif, E.; Ahmed, A. New Tetra-Schiff Bases as Efficient Photostabilizers for Poly(vinyl chloride). Molecules 2017, 22, 1506.

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