Evaluation of surface properties of betung bamboo (Dendrocalmus asper) strands under various heat treatment duration and temperature

Abstract

The abundance, rapid growth characteristics and good mechanical properties have made betung bamboo as good alternative materials to replace the slow growing wood. To adress the susceptibility to insects and water attack, the making of bamboo composites, using resin as matrix, has been widely practiced. Thus, the surface properties of bamboo strands are crucial to determine the optimum interaction with resin. This study evaluate the effect of heat treatment to improve the surface properties of bamboo strands, such as the wettability and the color change. Beforehand, the freshly cut bamboo was cut, cleaned and sand-grinded. The heat treatment was done at 140o and 160oC for 1, 2, and 3 hours. After cooling down to room temperature, the contact angle of bamboo’s surface was measured by sessile drop methode. The wettability was indicated by constant of contact angle change rate, K. Besides, the change of color was also determined. After the experiments, it was obtained that the bamboo surface tends to be more hydrophobic and has darker color with longer duration of heat treatment. Higher temperature and longer duration of heat treatment can cause more evaporation of liquid inside bamboo and decrease hydrophilicity of the surface.

Durability to Natural Weathering of Methylene Diphenyl Diisocyanate-Bonded Bamboo Oriented Strand Board

“…Several species of bamboo such as andong (Gigantochloa verticillata), ampel (Bambusa vulgaris), and betung (Dendrocalamus asper), have been investigated for their feasibility for developing BOSB. Among these, betung bamboo has evident to show satisfied physical, mechanical, and wettability properties, and it is compatible for BOSB production (Baiti et al 2021b;Febrianto et al 2012Febrianto et al , 2015Mangurai et al 2022;Maulana et al 2019;Murda et al 2022a).…”