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Characterization of thermally modified wood at different industrial conditions

Herrera R., Krystofiak T., Labidi J., Llano-Ponte R.

Drewno : prace naukowe, doniesienia, komunikaty

2016

vol. 59, nr 197

151--164

In this study European ash wood (Fraxinus excelsior L.) was modified at 192ºC and 202ºC in Thermo-Drewno®, Poland; and at 212ºC in Termogenik®, Spain. After modification, samples were characterized by wet chemistry according to standard methods (TAPPI) and by instrumental methods (FT-IR); in addition, surface and physical properties were measured (density, acidity, moisture, water uptake, contact angle, colour) in order to quantify changes due to treatment and temperature. The results showed that chemical composition of modified wood presents a gradual variation according to the heating regime, regardless of the industrial process applied; the greatest differences were obtained in treatment at 212°C compared to untreated wood. Furthermore, the density (< 0.68 g·cm-3) of modified wood decreased proportionally to treatment temperature. Colour measurements showed proportional changes to darker colours depending on the treatment temperature. On the other hand, some physical properties did not vary significantly between treatments, obtaining similar values of contact angle (97°-99°) and of moisture content (<7%).