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Synthesis of new polymeric hindered amine light stabilizers: Performance evaluation in styrenic polymers
Author(s) -
Singh R. P.,
Patwa A. N.,
Desai S. M.,
Pandey J. K.,
Solanky S. S.,
Vishwa Prasad A.
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12672
Subject(s) - isocyanate , polymer chemistry , amine gas treating , copolymer , styrene , polystyrene , grafting , polymer , solubility , materials science , chemistry , polyurethane , organic chemistry
Polymeric hindered amine light stabilizers (HALSs), in which the HALS functionality was attached to the terminal isocyanate chain end of poly(styryl‐ co ‐styryl isocyanate), were synthesized by a two‐step process. First, cinnamoyl azide was prepared and copolymerized with styrene by a free‐radical copolymerization method. Polymeric low‐molecular‐weight and high‐molecular‐weight 2,2,6,6‐tetramethyl‐4‐pipridinol‐ graft ‐poly(styryl‐ co ‐styryl isocyanate) and 4‐amino‐2,2,6,6‐tetramethyl piperidine‐ graft ‐poly(styryl‐ co ‐styryl isocyanate) were synthesized by a grafting method. The photodegradation and stabilization of different grades of high‐impact polystyrene (HIPS) were studied at 55°C in air at different time intervals, and the photostabilizing efficiency of polymeric HALSs was compared with conventional light stabilizers, such as 2,2,6,6‐tetramethyl‐4‐pipridinol and bis(2,2,6,6‐tetramethyl‐4‐piperidinyl)sebacate. Polymeric HALSs showed significant improvements in the photostabilization of HIPS. The solubility and diffusion coefficient of polymeric HALSs were studied. The morphological changes in HIPS caused by photooxidation were also studied. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1126–1138, 2003