Long-term weathering behavior of UV-curable clearcoats: Depth profiling of photooxidation,UVA, and HALS distributions |
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| Authors: | Email author" target="_blank">C?M?SeubertEmail author M?E?Nichols A?V?Kucherov |
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| Affiliation: | (1) Materials Research and Advanced Engineering, Ford Research and Advanced Engineering, 48121-2053 Dearborn, MI;(2) MD 3182, SRL-Room 2321, P.O. Box 2053, 48124 Dearborn, MI;(3) Zelinsky Institute of Organic Chemistry, RAS, Moscow, Russia |
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| Abstract: | 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 of 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.
Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago,
IL. |
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| Keywords: | UVA/HALS FTIR ATR UV spectroscopy photodegradation UV EB radiation cure weatherability |
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