Formulating waterborne coating for wood as a hygroscopic material adds another level of complexity to many other parameters that are usually considered by coating chemists. Most wood species used in exterior applications should be protected from decay fungi and insects either by preservative chemicals or by thermal modification. These modifications change the physical and chemical properties of wood in different ways, thus affecting coating performance. Coating's base has a significant effect on wetting and adhesion of the coating to the surface of modified and unmodified woods. This paper is focused on comparing properties and performance of number of waterborne coatings with solventborne coatings when applied on modified and unmodified woods exposed to natural weathering. Our results showed, although waterborne coatings had higher surface tensions and contact angles than solventborne coatings on wood, waterborne coatings performed equally well or better when compared with solventborne coatings with similar range of viscosity and flexibility (T_g).
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