Hadi Angham G, Baqir Sadiq J, Ahmed Dina S, El-Hiti Gamal A, Hashim Hassan, Ahmed Ahmed, Kariuki Benson M, Yousif Emad
Department of Chemistry, College of Science, University of Babylon, Babylon 51002, Iraq.
Medical Laboratories Techniques Department, Al-Mustaqbal University College, Babylon 51002, Iraq.
Polymers (Basel). 2021 Nov 15;13(22):3946. doi: 10.3390/polym13223946.
Poly(vinyl chloride) suffers from degradation through oxidation and decomposition when exposed to radiation and high temperatures. Stabilizers are added to polymeric materials to inhibit their degradation and enable their use for a longer duration in harsh environments. The design of new additives to stabilize poly(vinyl chloride) is therefore desirable. The current study includes the synthesis of new tin complexes of 4-methoxybenzoic acid and investigates their potential as photostabilizers for poly(vinyl chloride). The reaction of 4-methoxybenzoic acid and substituted tin chlorides gave the corresponding substituted tin complexes in good yields. The structures of the complexes were confirmed using analytical and spectroscopic methods. Poly(vinyl chloride) was doped with a small quantity (0.5%) of the tin complexes and homogenous thin films were made. The effects of the additives on the stability of the polymeric material on irradiation with ultraviolet light were assessed using different methods. Weight loss, production of small polymeric fragments, and drops in molecular weight were lower in the presence of the additives. The surface of poly(vinyl chloride), after irradiation, showed less damage in the films containing additives. The additives, in particular those containing aromatic (phenyl groups) substitutes, inhibited the photodegradation of polymeric films significantly. Such additives act as efficient ultraviolet absorbers, peroxide quenchers, and hydrogen chloride scavengers.
聚氯乙烯在受到辐射和高温时会因氧化和分解而降解。稳定剂被添加到聚合材料中以抑制其降解，并使其能够在恶劣环境中使用更长时间。因此，设计新型聚氯乙烯稳定剂是很有必要的。当前的研究包括4-甲氧基苯甲酸新型锡配合物的合成，并研究它们作为聚氯乙烯光稳定剂的潜力。4-甲氧基苯甲酸与取代氯化锡反应，以良好的产率得到相应的取代锡配合物。配合物的结构通过分析和光谱方法得以确认。聚氯乙烯用少量（0.5%）的锡配合物进行掺杂，并制成均匀的薄膜。使用不同方法评估了添加剂对聚合物材料在紫外线照射下稳定性的影响。在添加剂存在的情况下，重量损失、小聚合物碎片的产生以及分子量的下降都较低。辐照后，含添加剂的聚氯乙烯薄膜表面显示出较少的损伤。这些添加剂，特别是那些含有芳香族（苯基）取代基的添加剂，能显著抑制聚合物薄膜的光降解。此类添加剂可作为高效的紫外线吸收剂、过氧化物猝灭剂和氯化氢清除剂。
