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A New Approach to the Evaluation of Stabilizer Efficiency Under Photo-Ageing

โœ Scribed by Ashustosh Kumar; Sophie Commereuc; Vincent Verney; Pierre Lajoie; Jacques Lacoste

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
117 KB
Volume
289
Category
Article
ISSN
1438-7492

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โœฆ Synopsis

Abstract

Summary: Elastomers are very sensitive to oxidative degradation due to the combined effect of light and oxygen. Hence, we investigate the impact of stabilizers on the evolution of molecular structure of elastomers through photoโ€oxidation. While a dual processes is generally reported to describe photoโ€oxidation of elastomers (oxidation byโ€products formation and crosslinking), the aim of the current study is to provide a complete characterization of the efficiency of additives taking into account the dual processes: chemical changes (formation of photoproducts) and molecular structure changes (crosslinking). This work gives new insights about relationships between chemical changes and physical properties evolution of the material through ageing. We conclude that the two phenomenon are correlated to the primary peroxidation reaction and a dual efficiency does not exist for any additive.

Kinetic curves of carbonylated byโ€products formation upon photooxidation of stabilized EPDM films comparing with a unstabilized reference.

imageKinetic curves of carbonylated byโ€products formation upon photooxidation of stabilized EPDM films comparing with a unstabilized reference.

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