Radiochemical ageing of EPDM elastomers.: 2.: Identification and quantification of chemical changes in EPDM and EPR films γ-irradiated under oxygen atmosphere

被引：59

作者：

Rivaton, A ^{[1
]}

Cambon, S ^{[1
]}

Gardette, JL ^{[1
]}

机构：

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

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2005年 / 227卷 / 03期

关键词：

radiation; ageing; ethylene-propylene-diene monomer; ethylene-propylene rubber; oxidation products; derivatisation treatments;

D O I：

10.1016/j.nimb.2004.09.008

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

This paper is devoted to the identification and quantification of the main chemical changes resulting from the radiochemical ageing under oxygen atmosphere of ethylene-propylene-diene monomer (EPDM) and ethylene-propylene rubber (EPR) films containing the same molar ratio of ethylene/propylene. IR and UV-Vis analysis showed that radiooxidation produces a complex mixture of different products and provokes the consumption of the diene double bond. The radiochemical yields of formation of ketones, carboxylic acids, hydroperoxides and alcohols were determined by combining IR analysis with derivatisation reactions and chemical titration. The contributions of secondary and tertiary structures of these two types of -OH groups were separated. Esters and gamma-lactones were formed in low concentration. The oxidation products distribution in irradiated films was determined by micro-FTIR spectroscopy. Crosslinking was evaluated by gel fraction methods. In complement, the gas phase composition was analysed by mass spectrometry. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：343 / 356

页数：14

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