Effect of Acetylation on Some Strength Properties of Danta (Nesogordonia papaverifera) and Ananta (Cynometra Ananta)
Eric Donkor Marfo *
Department of Interior Design and Technology, Faculty of Built and Natural Environment, Takoradi Technical University, Ghana.
John Frank Eshun
Department of Interior Design and Technology, Faculty of Built and Natural Environment, Takoradi Technical University, Ghana.
Emmanuel Yaw Wereko
Department of Interior Design and Technology, Faculty of Built and Natural Environment, Takoradi Technical University, Ghana.
Gladys Ama Quartey
Department of Interior Design and Technology, Faculty of Built and Natural Environment, Takoradi Technical University, Ghana.
*Author to whom correspondence should be addressed.
Abstract
Dimensional stability and durability of wood can be improved by chemical modification. However, some strength properties are reduced, increased or not affected depending on the type of chemical used. Two high density tropical hardwood species, Nesogordonia papaverifera and Cynometra ananta which can be used for construction were acetylated and the impact of modification on the modulus of elasticity (MOE), modulus of rupture (MOR) and compressive strength parallel to the grain (CS) were analysed. The results indicated that the weight percentage gain (WPG) of 15.92 % and 15.20 % for acetylated Nesogordonia papaverifera and Cynometra ananta respectively had no significant change in MOE and MOR. The modification resulted in an increase in CPG by +15.71 % and +12.92 % for the modified Nesogordonia papaverifera and Cynometra ananta respectively.
Keywords: Chemical modification, strength properties, modulus of elasticity, modulus of rupture, compressive strength parallel to the grain