N. Allen, M. J. Harrison, Michelle Ledward
1989
Citations
0
Influential Citations
20
Citations
Journal
Polymer Degradation and Stability
Abstract
Abstract The effects of red and black oxides of iron on the photo-oxidation of nylon 6,6 film at 5 ppm concentration have been studied using viscometry and ultraviolet absorption at 294 nm together with the stabilising effect of three commercial metal deactivators; namely, Mark CDA-1, Naugard XL-1 and Irganox MD-1024. Both metal oxides are sensitizers of nylon 6,6 photo-oxidation. The presence of the metal deactivators effectively inhibits the photo-sensitising effect of the iron in the order Irganox MD-1024 > Naugard XL-1 > Mark CDA-1. The metal deactivators are also very effective light stabilisers in the absence of the added iron. There is a good correlation between the initial ultra-violet absorption at 294 nm of the polymer samples and their subsequent rates of photo-oxidation. It is concluded that the iron is a catalyst for the generation of ultra-violet absorbing impurities during the manufacture of the polymer and preparation of the film.