Nowadays the research in the field of wood coatings is loking for new opportunities to replace toxic chemical treatments with alternatives aiming the reduction of volatile organic emissions. The paper presents research concerning a new class of ecological, water based nanomaterials for wood finishing. Designed to exhibit bio-protective and aesthetic characteristics, these new nanomaterials, consisting of a hybrid of organic and inorganic nanomaterials, are based on composites of functionalized acrylic copolymers, in water dispersion, with TiO₂ nanoparticles, enabling a superior combination of properties that cannot be achieved by using any single material. The incorporation of nanomaterials into the wood surface coatings can provide long-term protection from harmful UV radiation without significantly effecting optical clarity, gloss, colour or physical properties.

The composite based on acrylic copolymer with titanium dioxide nanoparticles showed better wood coating properties comparing with the acrylic copolymer as such. This behaviour can be correlated with the interactions of acrylic copolymer segments with the inorganic titanium dioxide, enabling the formation of a crosslinked nanometric network of inorganic and organic domains put into evidence by AFM analysis. The chemistry behind the interaction of acrylic copolymer and titanium dioxide surface was demonstrated by FT-IR analysis. Improved properties are obtained as the result of complex interactions, by esterification, etherification, salt formation reactions, between the hydroxyl groups or titanil ion species from the nanostructured titanium dioxide (inorganic phase) and the acrylic ester, carboxyl and carboxylate groups from the acrylic copolymer (organic phase). The compatibility between titanium dioxide nanoparticles and acrylic copolymer explains the stability and the improved properties of the new wood coating nanomaterials.

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