PHYSICO-CHEMICAL AND MECHANICAL PROPERTIES OF THERMALLY MODIFIED WOOD OF Bombax ceiba L.
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Date
2019-11
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UHF,NAUNI
Abstract
ABSTRACT
The present research entitled “Physico-chemical and mechanical properties of thermally modified
wood of Bombax ceiba L.” was carried out in the Laboratory and Wood Workshop in the Department of Forest
Products, College of Forestry, Dr Y S Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during
2017-18 and 2018-19. Thermal modifications of wood samples were carried out at 80, 120, 160 and 200°C. The
study revealed significant variation between physico-chemical and mechanical properties of thermally modified
wood of Bombax ceiba. The maximum value of specific gravity (0.422), moisture content (23.86%) and
maximum moisture content (177.45%) were recorded in control, whereas the minimum value of specific gravity
(0.368), moisture content (1.01%) and maximum moisture content (133.55%) were recorded at 200°C. There
was no effect of thermal treatment on fiber length and vessel diameter and fine texture was observed for all
temperature treatments. The colour of wood became darker with increase in temperature treatments, nine
different colour were observed. The maximum value of shrinkage in longitudinal plane (0.29%), radial plane
(3.04%), tangential plane (3.20%) and the minimum value of shrinkage in longitudinal plane (0.09%), radial
plane (1.22%), tangential plane (1.38%), while maximum volumetric shrinkage (6.09%) and minimum
volumetric shrinkage (2.04%) were recorded in control. While Among temperatures the maximum value of
swelling in longitudinal (0.32%), radial (3.68%), tangential plane (3.37%) and minimum value of swelling in
longitudinal plane (0.07%), radial plane (2.27%), tangential plane (1.48%), while maximum value of
volumetric swelling (7.71%) and minimum volumetric swelling (3.42%) were recorded at 200°C. The maximum
cold water soluble extractives (7.09%), hot water soluble extractives (12.77%), and ash content (2.09%) were
recorded at 120°C, whereas the maximum holocellulose content (70.27%) at 160°C and the maximum alcohol
benzene soluble extractives (12.86%), lignin content (33.16%), were observed at 200°C. The minimum cold
water soluble extractives (4.42%), hot water soluble extractives (7.61%) and holocellulose content (64.79%)
were found to be at 200°C, while the minimum alcohol benzene soluble extractives (9.06%) in control and
lignin content (27.30%) at 80°C. The highest value of tensile strength (0.044 kN/mm2)and bending strength
(0.011 kN/mm2) were recorded in control, and compression strength parallel to grain (0.033 kN/mm2) at 80°C.
The lowest value of tensile strength 0.037 kN/mm2 and bending strength 0.007 kN/mm2 were recorded at 200°C,
whereas compression parallel to the grain (0.026 kN/mm2) observed minimum at 120°C.
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