Physical and mechanical properties and colour changes of fast-growing Gympie messmate wood subjected to two-step steam-heat treatments     

Pedro Henrique G. de Cademartori  André L. Missio  Bruno D. Mattos  Eduardo Schneid  Darci A. Gatto 《Wood material science & engineering》2014,9(1):40-48

This study aimed to evaluate physical and mechanical properties and colour changes of fast-growing Gympie messmate wood subjected to two-step steam-heat treatments. To achieve this, Gympie messmate wood was thermally treated under different conditions. Combined steam (127°C and ～0,1471 MPa) and heat treatments in an oven (180–240°C for 4 hours) were performed. Physical and mechanical properties were evaluated by weight loss, equilibrium moisture content, specific gravity, volumetric and linear swelling and static bending tests, while colour changes were studied using CIEL*a*b* technique. The main findings showed that the steam pre-treatment in autoclave influenced most of the technological properties evaluated, mainly for heat treatments performed in low temperatures (180–200°C). The most significant changes after thermal treatments were observed for dimensional stability, which increased as a function of temperature of treatment. On the other hand, mechanical strength of thermally modified wood was significantly affected, while stiffness did not change. Colour modifications due to the application of two-step steam-heat treatments confirm the possibility to using these samples for aesthetic purposes.  相似文献   

Wood-polymer composites prepared by free radical in situ polymerization of methacrylate monomers into fast-growing pinewood     

Mattos  Bruno D.  de Cademartori  Pedro H. G.  Missio  André L.  Gatto  Darci A.  Magalhães  Washington L. E. 《Wood Science and Technology》2015,49(6):1281-1294

Wood Science and Technology - The aim of this study was to evaluate treatability, morphology and mechanical resistance of composites prepared by in situ polymerization of methyl methacrylate on...  相似文献