earticle

영어

This study investigated the properties and evaluated the potential utilizations of Paulownia wood (Paulownia tomentosa) grown in Korea, as wood qualities, bioenergy properties, heat-treated wood, and nanocellulose. There were significant differences in wood anatomy, physical, and mechanical properties of stem, branch, and root in Paulownia wood. The dimensional change of Paulownia wood increased after extraction in cold and hot water. Paulownia wood showed great resistance to termites and fungi. In carbonized branch wood, the heating value and pH of tension, lateral, and opposite wood increased with increasing temperature, while the char yield decreased. The cell wall structure and morphology of tension wood significantly changed after carbonization. The hemicellulose, lignin, and cellulose were decomposed with the increasing carbonization temperature. The stem, branch, root, bark, and leaf showed differences in bioenergy properties, and the heating value and ash content of all parts satisfied the standard of NIFS. Air heat-treated P. tomentosa wood showed a darker color and higher contact angle compared to the untreated wood. The lightness (L*) and wettability decreased with increasing temperature, while the weight loss, shrinkage, color change (ΔE), and relative crystallinity increased with increasing temperature. The mechanical properties of heat-treated wood decreased with increasing temperature. In FTIR analysis of wood chemical compound, the peaks at 1425cm-1 and 1370 cm-1 related lignin and hemicellulose compound did not change with the increase of heat treatment temperature, while the peak at 1031 cm-1 related to carbohydrate compound decreased with increasing temperature. Paulownia wood had low gas permeability and sound absorption, and the effect of air heat treatment in gas permeability and sound absorption was insignificant. Oil heat-treated P. tomentosa wood showed darker color than the air heat-treated wood, and the color changes increased with increasing temperature. The weight of P. tomentosa wood increased after oil heat treatment, and the weight decreased with increasing temperature. Mechanical grinding for nanocellulose was more effective for branch than stem and root. The Nano film of all samples showed similar color, and transparency. In conclusions, Paulownia tree is high potential resource for Korean wood industry such as the raw materials of lumber, bioenergy, and pulp.