Effect of Atmospheric and Laboratory Irradiation on Attenuated Total Reflectance Spectra of Organic Coatings
Final technical note Mar 1966-Jul 1969
CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CA
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Attenuated Total Reflectance ATR spectra were obtained before and after irradiation of coating films as part of an investigation to develop better accelerated test methods for determining coating performance. The coatings included alkyd, oil, vinyl-alkyd, vinyl copolymer, partially hydrolyzed vinyl copolymer, epoxy-amine, and epoxy-polyamide films. Clear and pigmented films had previously been irradiated in air with a mercury arc amd with a xenon arc. These studies were extended to include longer xenon-arc irradiation and atmospheric exposures. 500-hour xenon-arc irradiation had little effect on alkyd film, slightly reduced the peak heights of a vinyl film, and produced a strong increase in the carbonyl absorption of an epoxy film. Five-month atmospheric exposure produced a general reduction in the peak heights of the ATR spectra of alkyd, vinyl, and epoxy films and produced increased in the carbonyl peaks of the epoxy films. Since the main effect on the surface of coating films, as judged by ATR spectra, is an increase in carbonyl content, this method of testing coatings appears most suited for those synthetic coatings that do not have strong initial carbonyl absorption.
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy