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Morphological Evolution of Polyoctenamer upon Photo‐Ageing
Author(s) -
Commereuc Sophie,
Svecova Lenka,
Verney Vincent
Publication year - 2003
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200290057
Subject(s) - amorphous solid , ageing , melting point , kinetics , kinetic energy , microstructure , materials science , redox , chemical engineering , chemistry , crystallography , composite material , metallurgy , engineering , biology , genetics , physics , quantum mechanics
Abstract The morphological structure evolutions of polyoctenamer upon photo‐ageing have been monitored with the aim of correlating the changes of the microstructure with our previous results concerning chemical and molecular evolutions. The influence of the experimental temperature of photo‐oxidation has been investigated with regard to the melting temperature of the different crystalline microphases. A critical point was clearly exhibited (10 h of UV exposure at 35 °C). Before this point the degradation occurs according an oxidative process and takes place only in the amorphous phases. During this period, the molecular structure changes to induce rapid cross‐linking. After the critical point, the chemical oxidation results from a photolytic process. The extent of the tridimensional network becomes invariant and imperfect crystalline zones are then affected.Kinetic curves of the formation of carbonylated by‐products (□) and peroxidic species (▪) through photo‐oxidation of V6040 films (thickness about 100 μm) at λ > 300 nm at 35 °C.