Enhancing photostability of poly(vinyl chloride) through additives: diorganotin (iv)-tyrosine complexes design

Poly(vinyl chloride) (PVC) undergoes deformation via decomposition and oxidation when exposed to heat and ultraviolet (UV) radiation. To counteract this degradation and prolong PVC's lifespan in harsh environments, the addition of stabilizers is essential. Therefore, the development of new additives that enhance PVC's stability is of great interest. In this recent investigation, novel tin complexes of tyrosine were synthesized and evaluated for their potential as photostabilizers for PVC. The interaction between tyrosine and tin chlorides yielded the modified tin complexes with satisfactory yields. The complexes’ structures were identified utilizing spectroscopic and analytical techniques. Subsequently, PVC was filled with 0.5 wt.% of the tin complexes, resulting in the production of homogeneous thin films. The plastic stability under UV light irradiation was estimated utilizing diverse methodologies. The presence of the additives led to diminished weight loss, reduced formation of tiny polymeric fragments, and mitigated decreases in molecular weight (M.Wt.). The additives- containing films demonstrated reduced surface damage post-irradiation. Notably, the additives with aromatic (phenyl) substitutions exhibited significant inhibition of photodegradation in the polymeric films. These additives functioned as effective hydrogen chloride scavengers, UV absorbers, and peroxide quenchers.