TY - JOUR
T1 - Grafting of Hindered Phenol Groups onto Ethylene/alpha-Olefin Copolymer by Nitroxide Radical Coupling
AU - Dintcheva, Nadka Tzankova
AU - Yang, Chengcheng
AU - Tempesti, Veronika
AU - Coiai, Serena
AU - Carroccio, Sabrina Carola
AU - Cicogna, Francesca
AU - Gorrasi, Giuliana
AU - Mendichi, Raniero
AU - Passaglia, Elisa
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
KW - Antioxidant covalent immobilization
KW - HAS-NOR antioxidant
KW - Hindered phenol moiety
KW - Nitroxide radical coupling
KW - Antioxidant covalent immobilization
KW - HAS-NOR antioxidant
KW - Hindered phenol moiety
KW - Nitroxide radical coupling
UR - http://hdl.handle.net/10447/260107
UR - http://www.mdpi.com/2073-4360/9/12/670/pdf
M3 - Article
SN - 2073-4360
VL - 9
SP - 1
EP - 19
JO - Polymers
JF - Polymers
ER -