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

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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.

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Authors and Affiliations

  1. Materials Research and Advanced Engineering, Ford Research and Advanced Engineering, 48121-2053, Dearborn, MI

    C. M. Seubert, M. E. Nichols & A. V. Kucherov (Visiting scientist)

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  1. C. M. Seubert
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  2. M. E. Nichols
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  3. A. V. Kucherov
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Correspondence to C. M. Seubert.

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Seubert, C.M., Nichols, M.E. & Kucherov, A.V. Long-term weathering behavior of UV-curable clearcoats: Depth profiling of photooxidation, UVA, and HALS distributions. J Coat. Technol. Res. 2, 529–538 (2005). https://doi.org/10.1007/s11998-005-0012-z

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  • DOI: https://doi.org/10.1007/s11998-005-0012-z

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