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Synthesis of new polymeric stabilizers for polymers
Author(s) -
Pan J. Q.,
Quek P. W.,
Liu N. C.,
Lau Wayne W. Y.
Publication year - 2000
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 - 10.1002/1097-4628(20001010)78:2<403::aid-app200>3.0.co;2-d
Subject(s) - polymer chemistry , monomer , isocyanate , methacrylate , thermal stability , copolymer , methacrylic acid , chemistry , succinic anhydride , hexamethylene diisocyanate , solubility , polymer , materials science , organic chemistry , polyurethane
A monomeric stabilizer (M), 2,2,6,6‐tetramethyl‐4‐piperidinyl(6‐methacryloyl amino)hexyl carbamate‐1, was synthesized by a two‐step controlled isocyanation in which methacrylic acid (MAA) reacted in the first step with hexamethylene diisocyanate (HMDI) at a 1 : 1 mol ratio to form an addition product containing one isocyanate group and one unsaturated double bond. In the second step, this product was reacted with 2,2,6,6‐tetramethyl‐4‐piperidinol (TMP) in a 1 : 1 mol ratio at 80°C in the presence of a catalyst dibutyltin dilaurate (DBTDL) to yield M. A new polymeric stabilizer, copolymer P1, was produced from M with methyl methacrylate (MMA) and another copolymer P2 was produced by reacting M with 2‐hydroxy‐4‐benzophenonyl allyl carbamate (AI‐DHBP). Azobisisobutylonitrile (AIBN) was used as an initiator. Their structures, thermal stability, extraction resistance, solubility in organic solvents, and stabilizing effectiveness against photooxidation and thermal oxidation of polypropylene (PP) were characterized by IR, NMR, TGA, and elemental analysis. The results show that both the monomeric and the polymeric stabilizers possess a stabilizing action for protecting PP against photooxidation and thermal oxidation. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 403–411, 2000