Composition of pyrolysis tars from lignocellulosic biomass and physical properties of plywood bonded with the tar-phenol resin adhesive
2006
Chang, S.K. | Sung, P.M. | Sang, B.P.
Pyrolysis tars discharged in industial carbonizations kilns during the carbonization of three lignocellulosic biomasses, oak wood (Quercus serrata), pine wood (Pinus densiflora) and bamboo (Phyllostachys pubescens), were characterized and used as a phenol resin substitute for plywood adhesives. The tars were separated into three fractions by solvent partition: ,ethanol-insoluble, ether-insoluble. The methanol-insolubles were mainly composed of charcoal dust with minute quantities of phenolic components. The ether-solubles of oak wood, pine wood and bamboo tars ranged from 74-94% of the total tar content and were composed of lignin-derived phenolics (51-72%), polycyclic aromatic hydrocarbon (PAH, 8-29%), and hydrophobic extractives (7-34%). The ether-insolubles appeared to have a strong reaction potential. The plywood panels bonded with the pyrolysis tar-phenol (PTP) adhesive did not show any consistent effects of tar contentlevel on the modulus of rupture (MOR) and modulus of elasticity (MOE) values. However, the tensile-shear strength was higher than taht of the control plywood for the phenol resin in both non-water boiled proof (NWBP) and water boiled proof (WBP) panels. With increasing tar content, the addition of pyrolysis tar to phenol resin adhesive further reduced formaldehyde emission levels.
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