Other
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..567w&link_type=abstract
The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 567-570 (1
Other
Energy-Conversion Spectro-Analytical Methods, Organic Compounds, Polymers
Scientific paper
An acrylic polymer automotive coating that had been subjected to Florida sun for 3 years was subsequently exposed to accelerated photochemical attack with Xenon lamps. Microtomed 6 μm-thick sections of the photochemically degraded polymer films were mounted between two 13 mm diameter×2 mm thick barium fluoride disks in a compression cell. With dual apertures 6 μm wide and 36 μm long, a line mapping procedure was performed by stepping the motorized stage in 5 μm increments. The chemical composition was mapped from the outermost edge through the degraded and washed out area into the pristine part of the clear coat, the base coat, and finally the primer. The results of incremental probing of the exposed acrylic polymer coating was compared to a retained specimen of the same material that had been protected from exposure to ultraviolet radiation. Previous attempts with photoacoustic infrared spectroscopy had established the destruction of some absorption bands and the appearance of new broad bands of oxidation products. The depth of the photochemical action was revealed by transmission probing as described here including 1 μm increment line mapping across the clear coat. Interdiffusion of adjacent clear and base coats was also evident. Other polymers subjected to impingement of O+4 at different levels of flux showed oxidation by ATR microspectroscopy of the exposed surface in comparison to spectra obtained by the same means from the unexposed back side of the 0.25 in-thick specimen of polypropylene.
Carter Roscoe O.
Wetzel David L.
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