Synthesis, characterization and performance evaluation of hindered amine light stabilizer end functionalized poly(ethylene-alt-propene) copolymer

A polymeric hindered amine light stabilizer (HALS), wherein the HALS functionality was attached to the terminal chain end of an alternating ethylene-propylene copolymer has been synthesized by terminating the living anionic polymerization of isoprene with 4(2,3-epoxy propoxy)-1,2,2,6,6-pentamethylpiperidine followed by hydrogenation of the resulting polymer using Ziegler type catalyst. The solubility and diffusion coefficient of this polymeric HALS have been studied and compared with conventional low and high molecular weight HALS (Tinuvin 770 and Chimasorb 944). The photo-stabilizing efficiency of this polymeric HALS was also studied and compared with conventional HALS at different concentrations and it was observed that polymeric HALS showed a significantly improved photo-stabilizing efficiency