1966 Volume 39 Issue 10 Pages 2085-2094
The deterioration of oxidative polymerized films, such as films of polymerized oils, alkyd resins, and phenolic varnishes, was studied by means of dynamic-mechanical measurements, in addition to such conventional methods as infrared spectral and elementary analysis. The visco-elastic changes induced by thermo-oxidation were correlated with the network structure of the films. The baked films are more stable than the air-dried films. The aliphatic chains decomposed more easily when a comparison was made among air-dried film and baked film of alkyd resin modified by unsaturated fatty acid; this is because of the existence of more hydroperoxyl and conjugated carbonyl groups and the effect of the drying agent contained in the air-dried film. After thermo-oxidation, the glass-transition temperature and the degree of crosslinking of the film showed an increase, an increase which is considered to be the result of the oxidative decomposition and cross-linking of aliphatic chains. It was also observed that the impact strength of baked film decreased upon thermo-oxidation.
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