Synthesis and photostabilizing performance of a polymeric HALS based on 1,2,2,6,6-pentamethylpiperidine and vinyl acetate

• Published in: Polímeros, ciência e tecnologia Vol. 25; no. 6; pp. 575 - 580
• Main Authors: Chinelatto, Marcelo Aparecido, Agnelli, José Augusto Marcondes, Canevarolo, Sebastião Vicente
• Format: Journal Article
• Language: English
• Published: Associação Brasileira de Polímeros 01-11-2015
• Subjects: degradation; HALS; hindered amines; photo-oxidation; photostabilizer
• ISSN: 0104-1428; 1678-5169; 1678-5169
• DOI: 10.1590/0104-1428.2057

Abstract Polymeric hindered amine light stabilizers (polymeric HALS) have been extensively studied because they combine a high ability to protect the polymers against harmful effects of weathering with minimum physical loss. In this study a new polymeric N-methylated HALS was synthesized by the radical copolymerization of a cyclic tertiary amine with vinyl acetate (VAc). 4-Acryloyloxy-1,2,2,6,6-pentamethylpiperidine (APP), the cyclic tertiary amine, was prepared by the initial conversion of 2,2,6,6-tetramethyl-4-piperidinol derivatives via two different routes. The APP/VAc copolymer synthesized was characterized by size exclusion chromatography (SEC), Fourier transform infrared spectroscopy (FTIR) and carbon-13 nuclear magnetic resonance (13C NMR). The photostabilizing performance, particularly the induction period of polypropylene (PP) films containing different concentrations of APP/VAc copolymer, when exposed to accelerated aging, was comparable to that of PP films compounded with commercial polymeric HALS.