Comparative study of wood flour photodegradation of two wood species submitted to artificial weathering

  • Matheus Poletto
Keywords: Color change, FTIR, lignin, photodegradation, wood.


In this work Eucalyptus grandis and Dipteryx odorata were submitted to photodegradation by ultraviolet radiation. The effect of ultraviolet radiation irradiation on the color change and chemical composition of each wood flour were evaluated. The samples were submitted to a total of 500h of artificial weathering using condensation stages and ultraviolet radiation B irradiation cycles. The changes in wood flour color were monitored by spectrocolorimetry, while the changes in wood chemical composition were evaluated by Fourier transform infrared spectroscopy. Both species showed changes in color with increased exposure time to artificial weathering. For both wood species the variation in color change was considered very appreciable after 500h. The Eucalyptus grandis specie showed appreciable color change after 120h, while for Dipteryx odorata specie the color change is appreciable only after 240h. The Fourier transform infrared spectroscopy results showed that lignin was strongly degrades by ultraviolet radiation radiation in both species. However, Dipteryx odorata was more resistant to photodegradation than Eucalyptus grandis, probably due to lower lignin content in this wood. The results clearly indicated that for the wood species studied the rate of weathering is influenced by wood species.


Barreto, C.C.K.; Pastore, T.C.M. 2009. Resistance to artificial weathering of four tropical woods: the effect of the extractives . Ciência Florestal 19(1):23-30.

Baysal, E.; Degirmentepe, S.; Simsek, H. 2014. Some surface properties of thermally modified scots pine after artificial weathering. Maderas Ciencia y tecnología 16(3):355-364.

Cademartori, P.H.G.; Missio, A.L.; Mattos, B.D.; Gatto, D.A. 2015. Natural weathering performance of three fast-growing eucalypt woods. Maderas. Ciencia y tecnología 17(4):799-808.

Chang, T.C.; Chang, H.T.; Wu, C.L.; Chang, S.T. 2010. Influences of extractives on the photodegradation of wood. Polymer Degradation and Stability 95:516-521.

Cui, W.; Kamdem, D.P.; Rypstra, T. 2004. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) and color changes of artificial weathering wood. Wood and Fiber Science 36(3):291-301.

Hikita, Y.; Toyada, T,; Azuma, M. 2001. Weathering testing timber - discoloration. In: Imamura, Y. High performance utilization of wood for outdoor uses. Press-net Kyoto, Japan.

Hill, C.A.S.; Cetin, N.S.; Quinney, R.F.; Derbyshire, H.; Ewen, R.J. 2001. An investigation of the potential for chemical modification and subsequent polymeric grafting as a mean of protecting wood against photodegradation. Polymer Degradation and Stability 72:133-139.

Lesar, B.; Pavlič, M.; Petrič, M. Škapin, A.S.; Humar, M. 2011. Wax treatment of wood slows photodegradation. Polymer Degradation and Stability 96:1271-1278.

Mitsui, K.; Tsuchikawa, S. 2005. Low atmospheric temperature dependence on photodegradation of wood. Journal of Photochemistry and Photobiology B: Biology 81: 84-88.

Pandey, K.K. 2005. Study of the effect of photo-irradiation on the surface chemistry of wood. Polymer Degradation and Stability 90:9-20.

Pandey, K.K.; Vuorinen, T. 2008. Comparative study of photodegradation of wood by a UV laser and a xenon light source. Polymer Degradation and Stability 93:2138-2146.

Poletto, M.; Zattera, A.J.; Santana, R.M. 2012. Structural differences between wood species: evidence from chemical composition, FTIR spectroscopy, and thermogravimetric analysis. Journal of Applied Polymer Science 126:E336-E343.

Tolvaj, L.; Persze, L.; Albert, L. 2011. Thermal degradation of wood during photodegradation. Journal of Photochemistry and Photobioly B: Biology 105:90-93.

Yeniocak, M.; Goktas, O.; Colak, M.; Ozen, E.; Ugurlu, M. 2015. Natural coloration of wood material by red beetroot (Beta vulgaris) and determination color stability under UV exposure. Maderas. Ciencia y tecnología 17(4):711-722.
How to Cite
Poletto, M. (1). Comparative study of wood flour photodegradation of two wood species submitted to artificial weathering. Maderas. Ciencia Y Tecnología, 19(2), 141-148. Retrieved from

Supporting Agencies