Influence of Benzamidomethionine Triorganotin(Iv) on Photostabilization Processes of Poly(Vinyl Chloride)

Abstract

The photostabilization of poly(vinyl chloride) (PVC) films by triorganotin(IV) complexes of the type Ph₃SnL, Bu₃SnL and Me₃SnL of the Triorganotin (IV) with Benzamidomethionine complexes was investigated. The PVC film containing concentration of complexes 0.5% by weight were produced by casting method from tetrahydrofuran (THF) solvent. The photostabilization activities of these compounds were determined by monitoring the carbonyl, polyene and hydroxyl indices with irradiation time. The changes in viscosity average molecular weight of PVC with irradiation time were also tracked (using THF as a solvent). The quantum yield of the chain scission ($\Phi_{cs}$) of these complexes in PVC films was evaluated and found to range between $5.72 \times 10^{-8}$ and $7.16 \times 10^{-8}$. Results obtained showed that the rate of photostabilization of PVC in the presence of the additive follows the trend: Ph₃SnL > Bu₃SnL > Me₃SnL According to the experimental results obtained, several mechanisms were suggested depending on the structure of the additive. Among them HCl scavenging, UV absorption, peroxide decomposer and radical scavenger for photostabilizer additives mechanisms were suggested.