Abstract
Wood exposed to the outdoor environment is susceptible to weathering due to a series of chemical, biological and physical processes. Acetylation of wood is known to reduce cell wall moisture content, improve dimensional stability and durability against fungal decay. As a result of these improvements, less stress is created between the coating and the wood surface improving the performance of the coating and increasing its useful lifetime. This paper is a review of research done on the chemistry of the acetylation process, the coating performance of acetylated wood and concentrates on the factors influencing coating performance.
Highlights
Acetylation of wood has been studied extensively and improves the properties and performance of low-durability wood species
The technology involves the reaction of wood with acetic anhydride and is a single-addition reaction, which means that one acetyl group is on one hydroxyl group with no polymerization: Coatings 2015, 5
All the weight gain in acetyl can be directly converted into units of hydroxyl groups blocked
Summary
Acetylation of wood has been studied extensively and improves the properties and performance of low-durability wood species. All the weight gain in acetyl can be directly converted into units of hydroxyl groups blocked. For maximum improvements in performance, a cell wall acetyl content above 20% is recommended. Shows the equilibrium moisture content (EMC), fiber saturation point (FSP), weight loss in an American Society for Testing and Materials, standard soil block test and dimensional stability of pine with an acetyl level of over 20%. From this table it is seen that there is a great reduction in moisture sorption in the cell wall, high dimensional stability and good resistance to decay fungi [4]
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