Long-term weathering behavior of UV-curable clearcoats : Depth profiling of photooxidation, UVA, and HALS distributions

The long-term weathering performance of two UV-curable clearcoat systems was studied using in plane microtomy in combination with infrared spectroscopy, UV spectroscopy, and ESR spectroscopy. Oxygen transport characteristics were also studied using the half-time method. The photooxidation versus dep...

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Bibliographic Details
Published in:JCT research 2005-07, Vol.2 (7), p.529-538
Main Authors: SEUBERT, C. M, NICHOLS, M. E, KUCHEROV, A. V
Format: Article
Language:English
Subjects:
Applied sciences
Coatings. Paints, varnishes and inks
Depth profiling
Exact sciences and technology
Film formation and curing, properties, testing
Infrared spectroscopy
Microtomy
Oxygen
Photooxidation
Polymer industry, paints, wood
Transport properties
Ultraviolet radiation
Weathering
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Summary:The long-term weathering performance of two UV-curable clearcoat systems was studied using in plane microtomy in combination with infrared spectroscopy, UV spectroscopy, and ESR spectroscopy. Oxygen transport characteristics were also studied using the half-time method. The photooxidation versus depth profile was highly dependant on the presence o f hindered amine light stabilizers (HALS) for both coating systems. Ultraviolet light absorbers (UVA) had little effect on the photooxidation profile. A photooxidation gradient was formed in both clearcoats due to a reduction in oxygen solubility when compared to standard thermoset clearcoats. This gradient was only seen in formulations not containing HALS.
ISSN:1547-0091
2168-8028
1935-3804
DOI:10.1007/s11998-005-0012-z