采用溶胶-凝胶法以铝的无机盐为原料制备溶胶,通过真空加压法将溶胶引入杨木纤维细胞壁内，分析改性后杨木纤维的性能。结果表明,铝溶胶处理木纤维的质量增加率受其含水率的影响,木纤维含水率越高,木纤维／氧化铝纳米复合材料的质量增加率越低。在溶胶处理木纤维过程中采用超声波处理,超声波时间越长,木纤维／氧化铝纳米复合材料的质量增加率越高。红外分析表明,在处理后木纤维的内部已经形成O—Al—O键,可以推测Al2O3凝胶的存在;扫描电镜-能谱分析(SEM-EDX)可看出,溶胶粒子已经渗入到细胞壁内,并保持了木材多孔结构。以杨木纤维-氧化铝纳米复合材料压制的中密度纤维板尺寸稳定性和阻燃性明显提高。
Abstract
In this paper，wood fiber/Al2O3 nano composites were produced by solgel technology with Al inorganic salt as the raw materials. Alsol was pushed into cell wall of poplar wood fibers though vacuumsoaking method. The performances of wood fiber/Al2O3 nano composites had been studied. In order to search the best preparing condition, the effect of moisture content and ultrasonic oscillation time on weight percent gain (WPG) had been studied: WPG of wood fiber/Al2O3 nano composites decreased with the raise of moisture; WPG of wood fiber/Al2O3 nano composites increased with increase of ultrasonic oscillation time. Infrared analysis showed O—Al—O had formed in the cell wall of the wood fibers. SEMEDX showed the sol had permeated into the cell wall and the porous structure of wood was maintained. Fiberboard was formed with fiber/Al2O3 composites and the dimensional stability and fire resistance of the fiberboard were also obviously improved.
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基金
收稿日期：2010-08-03修回日期：2010-12-21基金项目：国家自然科学基金项目(30771676);江苏省自然科学基金项目(BK2008424)；江苏省“青蓝工程”资助项目作者简介：姜维娜(1986—),硕士生。* 徐莉(通信作者),教授。Email: xuliqby@163.com。引文格式：姜维娜,曹文静,徐莉，等. 铝溶胶改性杨木纤维性能的研究［J］. 南京林业大学学报:自然科学版,2011,35(3):101-105.
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