UV-cured siloxane-modified methacrylic system containing hydroxyapatite as potential protective coating for carbonate stones

Amounts of HA particles ranging from 2.5 wt.% to 20 wt.% were added to a siloxane-modified methacrylic mixture, previously investigated. The effect of inclusion of HA particles in the methacrylic mixture on the final properties of the photopolymerizable systems, applied on glass support and on two different carbonate stone elements, was investigated. To this aim, the transparency and scratch hardness characteristics of the coatings, photo-cured on a glass substrate, were firstly measured. Then, the hydrophobic properties and the color change of the same coatings, applied and photo-cured on stone elements, were measured.