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Titolo:
IN-SITU DETECTION OF HINDERED AMINE STABILIZER CONSUMPTION IN POLYMERTHROUGH OXIDATION BY INDIRECT ELECTRON-SPIN-RESONANCE
Autore:
COMMEREUC S; SCHEIRS S; VERNEY V; LACOSTE J;
Indirizzi:
UNIV CLERMONT FERRAND,PHOTOCHIM MOL & MACROMOL LAB F-63177 AUBIERE FRANCE ENS CHIM CLERMONT FERRAND F-63177 AUBIERE FRANCE AGCY ENVIRONM & MAITRISE ENERGIE F-63000 CLERMONT FERRA FRANCE
Titolo Testata:
Journal of applied polymer science
fascicolo: 6, volume: 69, anno: 1998,
pagine: 1107 - 1114
SICI:
0021-8995(1998)69:6<1107:IDOHAS>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIGHT STABILIZERS; PHOTO-STABILIZATION; POLYPROPYLENE; MECHANISM; RADICALS;
Keywords:
HINDERED AMINE STABILIZER; POLYPROPYLENE; IN SITU DETECTION; ESR SPECTROSCOPY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
S. Commereuc et al., "IN-SITU DETECTION OF HINDERED AMINE STABILIZER CONSUMPTION IN POLYMERTHROUGH OXIDATION BY INDIRECT ELECTRON-SPIN-RESONANCE", Journal of applied polymer science, 69(6), 1998, pp. 1107-1114

Abstract

The stabilization mechanisms of hindered amine stabilizers (HAS) involve various oxidation products oft;he piperidine structure. Thus, we propose a novel method, based on electron spin resonance (ESR) spectroscopy, to check in situ the consumption of the total piperidyl species (intact HAS and all of its byproducts) in polypropylene (PP) films through photooxidation. First, the concentration of nitroxyl radicals produced upon irradiation in stabilized PP has been measured by direct ESR analysis. Then, the changes of concentration of the overall stabilizing species have been detected by indirect ESR, after conversion of the overall HAS derivatives into nitroxyl-free radicals by exposure of photooxidized PP to peracetic acid vapor at room temperature. Results were compared with those obtained by the conventional Fourier transforminfrared method in the particular case of [2,2,6,6-tetramethyl piperidinyl] sebacate, and the reliability of both techniques was discussed. Thus, we assume that indirect ESR experiments consist of a easy, accurate, and very sensitive method to monitor the time evolution of a low-molecular weight HAS-NH concentration in PP upon photooxidation. (C) 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1107-1114, 1998.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 07:14:57