Journal of Materials Science Research and Reviews

Some lesser used wood species from the forests in Ghana are non-durable and have low dimensional stability. These wood species can be modified to improve such properties. Thermal treatment of wood can improve wood properties such as resistance to wood-destroying fungi and dimensional changes depending on the treatment period and the temperature intensity, but has adverse effect on strength properties. The objective of this study was to evaluate impact of thermal modification on Modulus of elasticity (MOE), Modulus Of Rupture (MOR) and compression parallel to the grain (CP) of two Ghanaian Lesser-Used wood species Wawabima (Sterculia rhinopetala) and Niangon (Heritiera utilis. Thermal treatment of the two species showed that the MOE, MOR and CP decreased with increased heating temperature. The MOE of Sterculia rhinopetala decreased from 17,850.658 N/mm² to 16,520.002 N/mm² after thermal treatment from 150^oC to 240^oC. MOR decreased from 172.334 N/mm² to 70.181 N/mm² and CP from 75.246 to 57.934 N/mm². The MOE of Heritiera utilis decreased from 15,604.142 N/mm² to 9,155.977 N/mm², MOR from 144.465 N/mm² to 58.293 and CP from 52.842 to 39.103 N/mm². The thermal modification of Sterculia rhinopetala) and Heritiera utilis had negative impact on three mechanical properties of the two species.