Abstract

The effect of TiO 2 nanoparticles for sun-weathering protection of UV-cured coatings is investigated. TiO 2 is either introduced in the form of nanoparticles in the photocurable formulations or generated in situ via sol–gel process. Cured films containing comparable amounts of TiO 2 were weathered for 800 h under UV irradiation and compared with free-TiO 2 coating. The TiO 2 presence induces a clear lower mass loss decrease during weathering as well as a lower gel content decrease. The TiO 2 screen effect is also confirmed by a lower alkyl-band reduction monitored by FT-IR during weathering. The TiO 2 generated in situ via sol–gel gives rise to transparent coatings without interfering with photopolymerization process and therefore without compromising UV-cured film properties.

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