Photo-oxidation in an 18O2 atmosphere:: A powerful tool to elucidate the mechanism of UV-visible light oxidation of polymers -: Application to the photodegradation of MDMO-PPV

被引：20

作者：

Chambon, Sylvain ^{[1
,2
]}

Manceau, Matthieu ^{[1
,2
]}

Firon, Muriel ^{[2
]}

Cros, Stephane ^{[2
]}

Rivaton, Agnes ^{[1
]}

Gardette, Jean-Luc ^{[1
]}

机构：

[1] Univ Blaise Pascal, CNRS, Photochim Mol & Macromol Lab, UMR 6505, F-63177 Aubiere, France

[2] LCS, DTS, LITEN, DRT,INES, F-73370 Bourget Lac, France

来源：

POLYMER | 2008年 / 49卷 / 15期

关键词：

conjugated polymers; photodegradation; isotopic labelling;

D O I：

10.1016/j.polymer.2008.04.001

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

This article describes a new approach to improve the analysis of the chemical modifications that result from the degradation of polymers under UV-visible light exposure in the presence of oxygen. The tool which is used consists of an irradiation chamber whose atmosphere is composed of O-18(2). The O-18(2) pressure inside the chamber and the hygrometry can be adjusted. In this study, particular attention was paid to the photo-oxidation of poly[2-methoxy-5 -(3',7'-dimethyloctyloxy)- 1,4-phenylenevinylene] (MDMO-PPV). Using infrared spectroscopy, irradiation under the oxygen 18 atmosphere allowed discrimination between compounds formed via fixation of oxygen from the atmosphere and those formed by reorganisation of the matrix. In addition, irradiation of MDMO-PPV in an O-18(2) wet atmosphere allowed for detection of the presence of phenyl formate and aromatic ketone functions. This permitted validating the mechanism of photo-oxidation previously proposed. Additionally, with regard to blends made with MDMO-PPV and methano-fullerene[6,6]-phenyl C-61-butyric acid methyl ester ([60] PCBM), it was demonstrated that this technique facilitates the identification of the photo-oxidation products formed. (C) 2008 Published by Elsevier Ltd.

引用

页码：3288 / 3294

页数：7

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