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NADKA TZANKOVA DINTCHEVA

Grafting of Hindered Phenol Groups onto Ethylene/alpha-Olefin Copolymer by Nitroxide Radical Coupling

  • Authors: Coiai, S.; Cicogna, F.; Yang, C.; Tempesti, V.; Carroccio, S.; Gorrasi, G.; Mendichi, R.; Dintcheva, ; Passaglia, E.
  • Publication year: 2017
  • Type: Articolo in rivista (Articolo in rivista)
  • Key words: Antioxidant covalent immobilization; HAS-NOR antioxidant; Hindered phenol moiety; Nitroxide radical coupling;
  • OA Link: http://hdl.handle.net/10447/260107

Abstract

The covalent immobilization of hindered phenol groups, with potential antioxidant activity, onto an ethylene/α-olefin (EOC) copolymer was carried out by the nitroxide radical coupling (NRC) reaction performed in the melt with a peroxide and the 3,5-di-tert-butyl-4-hydroxybenzoyl-2,2,6,6-tetramethylpiperidine-1-oxyl radical (BHB-T). Functionalized EOC (EOC-g-(BHB-T)) was exposed to photo- and thermo-oxidation. By comparison with some model compounds bearing the (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) moiety or the hindered phenol unit, it was observed that the grafted BHB-T could effectively help the stabilization of the polymer matrix both under photo- and thermo-oxidation. In addition, the immobilization of BHB-T can effectively increase the service life of the functionalized polymers when polymer films were put in contact with ethanol solution thus simulating a possible application of the modified polymer.