We improved the overall performance of fast-growing poplar by utilizing a low-cost, effective and simple method. The fast-growing poplar was modified by a vacuum-pressure impregnation method with three types of modifi...We improved the overall performance of fast-growing poplar by utilizing a low-cost, effective and simple method. The fast-growing poplar was modified by a vacuum-pressure impregnation method with three types of modification solutions composed of phe- nol-melamine-formaldehyde （PMF） co-condensed resin, diatomite, and 3-aminopropyl （diethoxy） methylsilane. We measured the weight percent gain （WPG）, bulking, leaching, anti-swelling efficiency （ASE）, wa- ter-repellent effectiveness （WRE）, and oxygen index of the modified specimens. All of the wood physical properties, which are beneficial for human uses, were significantly improved by the treatment. We improved various characteristics of wood and the oxygen index of poplar above 48.6% after the modification using diatomite and PMF co-condensed resin.展开更多
Poplar lumber (Populus ussuriensis) is impregnated with low molecular weight PF resin, then it is heated and compressed so that the resin is fixed in wood. The wood is called surface compressive wood. This paper measu...Poplar lumber (Populus ussuriensis) is impregnated with low molecular weight PF resin, then it is heated and compressed so that the resin is fixed in wood. The wood is called surface compressive wood. This paper measured the index of physical mechanical properties. The result show that the average density of untreated wood is 415kg·m -3 , with the increase of compression set, the density went up clearly. From surface to inner the density is decrease gradually. With the increase of compression set , the compression strength of parallel to grain, bending strength, modulus of elasticity and surface hardness is raised obviously. The color of wood is slightly varied to yellow.展开更多
基金supported by Program for New Century Excellent Talents in University(NCET-10-0311)the National Natural Science Foundation of China(31000271)the Fundamental Research Funds for the Central Universities(DL11BB29)
文摘We improved the overall performance of fast-growing poplar by utilizing a low-cost, effective and simple method. The fast-growing poplar was modified by a vacuum-pressure impregnation method with three types of modification solutions composed of phe- nol-melamine-formaldehyde （PMF） co-condensed resin, diatomite, and 3-aminopropyl （diethoxy） methylsilane. We measured the weight percent gain （WPG）, bulking, leaching, anti-swelling efficiency （ASE）, wa- ter-repellent effectiveness （WRE）, and oxygen index of the modified specimens. All of the wood physical properties, which are beneficial for human uses, were significantly improved by the treatment. We improved various characteristics of wood and the oxygen index of poplar above 48.6% after the modification using diatomite and PMF co-condensed resin.
文摘Poplar lumber (Populus ussuriensis) is impregnated with low molecular weight PF resin, then it is heated and compressed so that the resin is fixed in wood. The wood is called surface compressive wood. This paper measured the index of physical mechanical properties. The result show that the average density of untreated wood is 415kg·m -3 , with the increase of compression set, the density went up clearly. From surface to inner the density is decrease gradually. With the increase of compression set , the compression strength of parallel to grain, bending strength, modulus of elasticity and surface hardness is raised obviously. The color of wood is slightly varied to yellow.
