Poly(vinyl chloride) (PVC) is commonly used in many industrial applications. Ultraviolet (UV) radiation causes undesirable changes to PVC properties. Therefore, PVC should be protected from radiation to increase its lifetime for outdoor applications. Here, new organotin complexes containing captopril were synthesized for use as low‐concentration additives to enhance PVC photostability. Reacting captopril with the appropriate organotin chloride or dibutyltin oxide gave the corresponding organotin complex in 63% to 89% yield. Captopril tin complexes (0.5 wt%) were added to PVC solution and thin films were produced. The films were irradiated with UV light for 300 hours. The formation of specific functional groups and reduction in weight and molecular weight were monitored during irradiation. In addition, the surface morphology was checked pre before and after irradiation. The results confirmed that undesirable changes in the PVC films occurred to a lower extent in the presence of captopril tin complexes. These additives function as UV absorbers, scavengers for hydrogen chloride, and decomposers for peroxide and coordinate well with the PVC chains. The triphenyltin complex was the best inhibitor of PVC photodegradation, which is likely due to its high aromatic content.

中文翻译：

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含有卡托普利锡配合物的聚（氯乙烯）的稳定化，使其在紫外线照射下不会降解

聚（氯乙烯）（PVC）通常用于许多工业应用中。紫外线（UV）会导致PVC性能发生不良变化。因此，应保护PVC免受辐射，以延长其在户外应用中的寿命。在这里，合成了新的含卡托普利的有机锡复合物，用作低浓度添加剂，以增强PVC的光稳定性。卡托普利与适当的有机锡氯化物或二丁基氧化锡反应，得到相应的有机锡络合物，产率为63％至89％。将卡托普利锡络合物（0.5 wt％）添加到PVC溶液中，制得薄膜。将膜用紫外线照射300小时。在照射过程中监测特定官能团的形成以及重量和分子量的减少。此外，在辐照之前和之后检查表面形态。结果证实，在存在卡托普利锡配合物的情况下，PVC膜发生了不希望的变化。这些添加剂可作为紫外线吸收剂，氯化氢清除剂和过氧化物分解剂，并与PVC链良好配合。三苯基锡配合物是PVC光降解的最佳抑制剂，这很可能是由于其芳族化合物含量高。