Abstract
This study develops a process for enhancing the photostabilization of PVC films blended with a low concentration of mefenamate–tin complex. One tri-substituted and three di-substituted organotin complexes containing mefenamate unit are synthesized, and their chemical structures are established. The reactions of mefenamic acid and a number of substituted tin chlorides gave the corresponding tin complexes in 70–77% yields. Tin complexes were blended with PVC and thin films. The effect of the addition of additives against long-term irradiation (290–400 nm, 300 h) is also tested. Changes in the infrared spectra, weight, and surface of the PVC blends due to irradiation are examined and analyzed. Any damage to the PVC surface and its chemical degradation level are noticeably low in the presence of additives. Minimal photodegradation levels and surface changes of the irradiated PVC films are observed when the triphenyltin complex is used. Such a complex is highly aromatic and can act as an ultraviolet irradiation absorber and a scavenger for hydrogen chloride and radicals produced due to the photooxidation and photoirradiation of PVC films.
Highlights
Thermoplastics are common polymers with high molecular weight, which are moldable at elevated temperatures
Polypropylene, and polystyrene, polyvinyl chloride (PVC) is a well-known plastic with unique properties that allows for its use in several applications
PVC is produced in large quantities in both rigid and flexible forms [1]
Summary
Thermoplastics are common polymers with high molecular weight, which are moldable at elevated temperatures. The physical properties of plastics can dramatically worsen below their melting point and above glass transition temperatures. Polypropylene, and polystyrene, polyvinyl chloride (PVC) is a well-known plastic with unique properties that allows for its use in several applications. PVC is produced in large quantities in both rigid and flexible forms [1]. Rigid PVC is frequently used in the production of construction materials (e.g., pipes, doors, and windows), bottles, cards, and packaging. The addition of plasticizers can reduce PVC brittleness and make it as soft as rubber. Soft PVC is used in manufacturing cable insulation, plumbing, and flooring. Pure PVC is a brittle white solid that is soluble in tetrahydrofuran (THF). The majority (80%) of PVC is produced through suspension polymerization along with 20%
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