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BLISTERING AND DEGRADATION OF POLYURETHANE COATINGS UNDER DIFFERENT ACCELERATED WEATHERING TESTS. (R828081E01)
Citation:
Yang, X. F., D. E. Tallman, S. G. Croll, AND G. P. Bierwagen. BLISTERING AND DEGRADATION OF POLYURETHANE COATINGS UNDER DIFFERENT ACCELERATED WEATHERING TESTS. (R828081E01). ANALYTICA CHIMICA ACTA. American Chemical Society, Washington, DC, 77(1):103-109, (2002).
Description:
An epoxy primer with a high gloss polyurethane topcoat coating system was exposed either only in a QUV chamber or exposed in a QUV chamber and a Prohesion chamber, alternatively, in this study. AFM studies found that micro blisters formed on the coating surface after both exposures. Blisters formed under the QUV exposure developed in their size with increasing exposure time while those formed under the QUV/Prohesion alternating exposure retained their size throughout of the exposure time. The development of blisters caused the increase of surface roughness and the initial gloss loss of the coating. SEM showed that the QUV exposure is more damaging than the QUV/Prohesion alternating exposure.
Author Keywords: AFM; Accelerated weathering test; Coating degradation; Urethane