Weathering chemically modified woods

Dunningham, E.A., Plackett, D.V. and Singh, A.P. (1992). Weathering of chemically modified wood. Natural weathering of acetylated radiata pine preliminary results. Holz als Roh- und... 

Evans, P.D., Wallis, A.E.A. and Owen, N.L. (2000). Weathering of chemically modified wood surfaces. Natural weathering of Scots pine acetylated to different weight gains. Wood Science and Technology, 34(2), 151-165. 

Feist, W.C. and Rowell, R.M. (1982). Ultraviolet degradation and accelerated weathering of chemically modified wood. In Graft Copolymerization of Lignocellulosic Fibers, Hon, D.N.S. (Ed.). ACS Symposium Series, 187, pp. 349-370. 

UV Degradation and Accelerated Weathering of Chemically Modified Wood... 

Chemical modification of wood cell wall components has been shown to be successful in imparting resistance to various degrading elements ( 15, 16, 17). Reduced hygroscopicity of chemically modified woods has been demonstrated (18, 1 , 20). There are no chemical modifications published in which UV stabilization and control of hygroscopicity (the main weathering elements) were the primary goals of the modification (15). 

This section of the chapter addresses the performance of chemically modified wood against weathering. Although, as indicated earlier, some form of chemi-... 

Chemical modification of wood, in which chemical moieties are covalently bound to the wood, offers tremendous potential as a general way of upgrading important wood properties such as biological durability and dimensional stability, and may also provide a route to weather-resistant wood products in the future. Research to date has shown that some types of chemically modified wood appear to at least partially resist the surface effects of weathering. The challenge for the future will be to better understand the factors contributing... 

Rowell, R.M., Feist, W.C. and Ellis, W.D. (1981). Weathering of chemically modified southern pine. Wood Science, 13(4), 202-208. 

Southern pine with a dual treatment of chemical modification with butylene oxide or butyl isocyanate followed by lumen-fill treatment with methyl methacrylate, or southern pine impregnated with methyl methacrylate and polymerized in situ, resulted in modified woods that were resistant to accelerated weathering and to ultraviolet light alone. Physical, chemical, and microscopic changes occurring as a result of ultraviolet light irradiation are described. 

Fujimoto [56] examined the weathering behavior of Japanese bass wood Tilia japonica) that had been chemically modified with a maleic acid-glycerol (MG) mixture. In a vertical outdoor exposure test, the surface smoothness of MG-treated samples was maintained over an 18-month period and the results suggested that this type of treatment might provide wood products with good exterior performance properties. 

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