Abstract
Poly(vinyl chloride) is a common plastic that is widely used in many industrial applications. Poly(vinyl chloride) is mixed with additives to improve its mechanical and physical properties and to enable its use in harsh environments. Herein, to protect poly(vinyl chloride) films against photoirradiation with ultraviolet light, a number of tin complexes containing valsartan were synthesized and their chemical structures were established. Fourier-transform infrared spectroscopy, weight loss, and molecular weight determination showed that the non-desirable changes were lower in the films containing the tin complexes than for the blank polymeric films. Analysis of the surface morphology of the irradiated polymeric materials showed that the films containing additives were less rough than the irradiated blank film. The tin complexes protected the poly(vinyl chloride) films against irradiation, where the complexes with high aromaticity were particularly effective. The additives act as primary and secondary stabilizers that absorb the incident radiation and slowly remit it to the polymeric chain as heat energy over time at a harmless level.
Highlights
Plastics are extensively used as replacements for metals, glass, and wood in many modern applications [1]
We report the synthesis of a Polymers 2020, 12, 969 number of new tin complexes containing valsartan
The purity and elemental composition of the synthesized tin complexes 1–4 were confirmed by elemental analysis
Summary
Plastics are extensively used as replacements for metals, glass, and wood in many modern applications [1]. Stabilizers containing a mixture of barium and zinc are considered non-hazardous a PVC plasticizer in the past. It is non-volatile, oily, has a low production cost, and is compatible under normal use. Various additives (Figure 1), including polyphosphates [18,19,20], Schiff bases [21,22,23,24,25], For example, stabilizers containing a mixture of barium and zinc are considered non-hazardous aromatic compounds [26,27], and organic–metal complexes [28,29,30,31], were investigated for use as PVC under normal use. It was expected that the synthesized tin complexes, and in particular those with a high degree of aromaticity, would act as efficient PVC stabilizers
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