功能型改性剂对轻木性能的影响

以人工林轻木为研究对象，采用酚醛树脂和壳聚糖2种不同功能类型的改性剂对试件进行改性处理，并用傅立叶变换红外光谱仪、X射线衍射仪对改性前后木材的相关性能进行表征，分析改性前后木材性能的变化。结果表明，PF树脂改性后，轻木的抗胀率和阻湿率达到30％左右，端面硬度、径面硬度和顺纹抗压强度分别提高29.7％，25.0％，50.0％；单位质量的壳聚糖对轻木力学性能的贡献是PF树脂的4～8倍。红外光谱图表明，改性剂与木材内部基团发生交联反应。X射线衍射仪测试表明，木材改性剂使木材结晶区域宽度均增加约0.2 nm，其中PF处理后轻木的相对结晶度提高4.0％，而壳聚糖处理后的轻木相对结晶度提高约12.2％。

Effect of Modification with Modifiers on Physical and Mechanical Properties of Balsa Wood

Modification treatment of balsa wood was conducted through 2 wood modifiers of phenol-formalde-hyde resin and chitosan,and compared the characteristics of the treated and untreated wood with X-ray diffractome-ter （XRD）,and Fourier transform infrared （FTIR）spectrophotometer.Results indicated that the ASE and MEE reached around 30%,and the surface hardness and compressive strength parallel grain of the treated wood in-creased by about 29.7%,25.0% and 50.0% after PF impregnation,respectively.The chitosan had the better effect of modification than PF because the chitosan had the 4-8 times increments on physical properties of wood than PF.The FTIR and XRD spectra test showed that there was cross-linking reaction between the modifier and the internal parts of the wood.And the modifier could increase the width of crystal region about 0.2 nm,and the rela-tive crystallinity of balsa wood was increased by 4.0%after PF treatment.Moreover,chitosan had an obvious effect on the relative crystallinity of balsa wood,increasing it about 12.2%.