Journal
MOLECULES
Volume 22, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/molecules22091506
Keywords
poly(vinyl chloride); Schiff bases; functional group's indices; atomic force microscopy; photodegradation; irradiation; viscosity average molecular weight
Funding
- King Saud University
- Research Chairs and Al-Nahrain and Tikrit Universities
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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 mu m thickness) in the presence of Schiff bases (0.5 wt %) upon irradiation (300 h) with a UV light (lambda(max) = 365 nm and light intensity = 6.43 x 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.
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