Abstract
The exterior durability of a wood-coating is low, especially when it is a protective stain. The severest degradation comes from the dimensional variations of the wood which strains the coating and leads to the formation of cracks. Thus, the service life of a wood coating system con be increased by various means: ▀ improvement of the coating flexibility and also by reducing the glass transition temperature (Tg) below the temperature of use. ▀ dimensional stabilisation of wood, for which thermal and chemical treatments (acetylation) are efficient, although most of them decrease the wettability of the wood surface and the adhesion of the coating. Polyethylene glycol (PEG) can be used to stabilise wood and con be added directly in the finishing primer. ▀ improvement of coating adhesion by a modification of the wood surface. For example, plasma treatments have been applied to wood, with and without thermal treatments, in order to improve its surface properties.
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