Department of Chemistry, College of Science, University of Babylon, Babylon 51002, Iraq.
Cornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia.
Molecules. 2021 Jun 14;26(12):3629. doi: 10.3390/molecules26123629.
Poly(vinyl chloride) degrades when exposed to ultraviolet light for long durations; therefore, the photostability of polymeric materials should be enhanced through the application of additives. New organotin complexes containing 4-aminonaphthalene-1-sulfonic acid were synthesized and their role as poly(vinyl chloride) photostabilizers were evaluated. The reaction of 4-amino-3-hydroxynaphthalene-1-sulfonic acid and appropriate di- or trisubstituted tin chloride (triphenyltin chloride, tributyltin chloride, dibutyltin dichloride, and dimethyltin dichloride) in methanol under reflux gave the corresponding tin-naphthalene complexes with yields of 75%-95%. Elemental analyses and spectroscopic techniques including infrared and nuclear magnetic resonance (proton and tin) were used to confirm their structures. The tin complexes were added to poly(vinyl chloride) to produce thin films that irradiated with ultraviolet light. Various parameters were assessed, such as the weight loss, formation of specific functional groups, changes in the surface due to photoirradiation, and rate constant of photodegradation, to test the role played by the organotin complexes to reduce photodegradation in polymeric films. The results proved that organotin complexes acted as photostabilizers in these circumstances. The weight loss, formation of fragments containing specific functional groups, and undesirable changes in the surface of polymeric films were limited in the presence of organotin complexes. Organotin complexes containing three phenyl groups showed the most desirable stabilization effect. These act as efficient primary and secondary photostabilizers, and as decomposers for peroxides. In addition, such an additive inhibits the dehydrochlorination process, which is the main cause of poly(vinyl chloride) photodegradation.
聚氯乙烯在长时间暴露于紫外线下会降解；因此，应通过添加助剂来提高聚合物材料的光稳定性。合成了含有 4-氨基萘-1-磺酸的新型有机锡配合物，并评价了它们作为聚氯乙烯光稳定剂的作用。4-氨基-3-羟基萘-1-磺酸与适当的二价或三价锡氯化物（三苯基氯化锡、三丁基氯化锡、二丁基二氯化锡和二甲基二氯化锡）在甲醇中回流反应，得到相应的锡-萘配合物，产率为 75%-95%。元素分析和包括红外和核磁共振（质子和锡）在内的光谱技术用于确认其结构。将锡配合物添加到聚氯乙烯中以制备薄 膜，然后用紫外线照射。评估了各种参数，例如重量损失、特定官能团的形成、光照射引起的表面变化和光降解速率常数，以测试有机锡配合物在减少聚合物薄膜光降解方面的作用。结果证明，在这些情况下，有机锡配合物起到了光稳定剂的作用。在有机锡配合物的存在下，限制了重量损失、形成含有特定官能团的片段以及聚合物薄膜表面的不良变化。含有三个苯基的有机锡配合物表现出最理想的稳定效果。它们作为有效的初级和次级光稳定剂，以及过氧化物的分解剂。此外，这种添加剂抑制了脱氯化氢过程，这是聚氯乙烯光降解的主要原因。
