Abstract
The photostabilization of polyvinyl chloride (PVC) films by Schiff bases was investigated. Polyvinyl chloride films containing 0.5 wt % Schiff bases were produced using the same casting method as that used for additive-free PVC films from tetrahydrofuran (THF) solvent. The photostabilization activities of these compounds were determined by monitoring the carbonyl, polyene and hydroxyl indices with irradiation time. The changes in viscosity average molecular weight of PVC with irradiation time were also monitored using THF as a solvent. The quantum yield of chain scission (Φcs) for the studied complexes in PVC was estimated to range between 4.72 and 8.99 × 10−8. According to the experimental results, several mechanisms were suggested, depending on the structure of the additive. Ultra violet (UV) absorption, peroxide decomposition and radical scavenging were suggested as the photostabilizing mechanisms.
Highlights
Polyvinyl chloride is the third-most widely produced synthetic plastic polymer after polyethylene and polypropylene and is widely used in several industries, including architecture, electronic, chemical engineering, packaging, and transportation [1,2,3,4]
There has been no attempt to investigate the photostabilization of polyvinyl chloride (PVC) films by Schiff bases containing four 1,3,4-thiadiazole rings; in this study, we report the design of the Schiff bases and the study of their use as a photostabilizing reagents
Exposing the PVC films to light over various radiation times leads to clear changes in their Fourier transform infrared spectroscopy (FTIR) spectra (Figure 1)
Summary
Polyvinyl chloride is the third-most widely produced synthetic plastic polymer after polyethylene and polypropylene and is widely used in several industries, including architecture, electronic, chemical engineering, packaging, and transportation [1,2,3,4]. The low cost and good performance of polyvinyl chloride products have increased the utilization of this polymer in construction, mainly in exterior applications, such as window profiles, cladding structures and siding. It is important to perform efficient accelerated experiments and to investigate the effects of degradation factors of polyvinyl chloride under the required conditions of this application. Polymer materials have found a number of important applications in dye-sensitized solar cells (DSSCs) as luminescent and protective coatings [7], templates for designing new nanostructured TiO-electrodes [8], stable electrolytes [9], conductive plastic substrates [10], counter electrodes [11]. There has been no attempt to investigate the photostabilization of PVC films by Schiff bases containing four 1,3,4-thiadiazole rings; in this study, we report the design of the Schiff bases and the study of their use as a photostabilizing reagents
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