Abstract
Five Schiff bases containing a thiadiazole moiety have been used as poly(vinyl chloride) photostabilizers at low concentrations. The efficiency of Schiff bases as photostabilizers was investigated using various techniques, for example, the changes in poly(vinyl chloride) infrared spectra, molecular weight, chain scission quantum yield, and surface morphology were monitored upon irradiation with an ultraviolet light. Evidently, all the additives used inhibited poly(vinyl chloride) photodegradation at a significant level. The most efficient Schiff base exhibited a high level of aromaticity and contained a hydroxyl group. It seems possible that such photostabilization could be due to the direct absorption of ultraviolet radiation by the additives. In addition, Schiff bases could act as radical scavengers and proton transfer facilitators to stabilize the polymeric materials.
Highlights
The global production and consumption of plastics have increased over the years [1]
We report the effective use of Schiff’s bases containing thiadiazole ring systems at low concentrations, as Poly(vinyl chloride) (PVC) additives, to inhibit its photodegradation as part of our continuing research in the area of polymers [43,44,45,46,47,48,49,50]
The IR spectra of Schiff bases 1–5 showed the presence of the CH=N bonds as an intense signals at 1597–1618 cm–1
Summary
The global production and consumption of plastics have increased over the years [1]. Poly(vinyl chloride) (PVC) is ranked third among the most produced plastics, next to polyethylene and polypropylene [2]. Phthalates are under pressure in Europe due to the potential risk associated with their uses in medical applications, such as blood bags Metal stabilizers, such as cadmium, lead, and tin-based stabilizers (Figure 1) are very common. Recent research shows that various additives have been used successfully at low concentrations to reduce PVC photodegradation. We report the effective use of Schiff’s bases containing thiadiazole ring systems at low concentrations, as PVC additives, to inhibit its photodegradation as part of our continuing research in the area of polymers [43,44,45,46,47,48,49,50]. Schiff bases containing a thiadiazole moiety are expected to absorb UV irradiation and protect PVC against photodegradation
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