Hybrid Approach for Wood Modification: Characterization and Evaluation of Weathering Resistance of Coatings on Acetylated Wood

Wood, as a biological material, is sensitive to environmental conditions and microorganisms; therefore, wood products require protective measures extend their service life in outdoor applications. Several modification processes are available for the improvement of properties, including commercially solutions. Among chemical treatments, acetylation by acetic anhydride one most effective methods induce changes constitutive polymers at cellular wall level. Acetylation reduces shrinkage-swelling, increases its durability against biotic agents, improves UV resistance surface erosion. However, even if expected external cladding acetylated estimated be 60 years, aesthetics change rapidly during first years exposure. Hybrid, or fusion, includes where positive effect single treatment can multiplied merging with additional follow-up modifications. This report presents results performance tests samples that, besides means acetylation, were additionally protected seven coatings. Natural weathering was conducted Northern Italy 15 months. Samples characterized numerous instruments measuring collected from stand every three Superior observed on that merged both treatments. It due combined coating. Limited shrinkage/swelling bulk substrate substantially reduced stresses coating film. Hybrid process, compared sole wood, assured superior visual preserving original appearance.