UV resistance is the ability of a coating or of a polymer to keep its appearance and its mechanical properties under prolonged ultraviolet exposure. The damage begins with the absorption of a photon by a chromophore, and the resulting radical initiates chain scission or crosslinking [1]. Accelerated weathering reproduces the trend but not the absolute rate, because the spectral power distribution of the lamp differs from that of sunlight [2]. Inorganic absorbers scatter or absorb the ultraviolet before it reaches the bulk, and a clear coating needs particles well below the wavelength of light [3]. Test standards differ in cycle length and in the inclusion of a condensation step, so results from different laboratories are not directly comparable [4]. Water taken up during a humidity cycle accelerates the loss more than the ultraviolet dose alone [5].
- photodegradation
- accelerated weathering
- ultraviolet absorber
- chain scission
- coating durability
- colour retention
- condensation cycle
Surface Treatment and Coatings·Mechanical Engineering·Engineering·Physical Sciences
References
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- Sudoł, E.; Kozikowska, E.; Szewczak, E. Artificial Weathering Resistance Test Methods for Building Performance Assessment of Profiles Made of Natural Fibre-Reinforced Polymer Composites. Materials 2021, 15, 296. [CrossRef]
- Patti, A.; Acierno, D. The Puncture and Water Resistance of Polyurethane- Impregnated Fabrics after UV Weathering. Polymers 2019, 12, 15. [CrossRef]