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林业科学 ›› 2009, Vol. 12 ›› Issue (10): 120-125.doi: 10.11707/j.1001-7488.20091020

• 论文 • 上一篇    下一篇

水热-微波处理对榆木软化和顺纹压缩及弯曲的影响

宋魁彦 李坚   

  1. 东北林业大学材料科学与工程学院 哈尔滨150040
  • 收稿日期:2008-07-31 修回日期:1900-01-01 出版日期:2009-10-25 发布日期:2009-10-25
  • 基金资助:
     

Effect of Hydrothermal-Microwave Treatment on Softening and Longitudinal Compressing and Bending Elm Wood

Song Kuiyan,Li Jian   

  1. College of Material Science and Engineering,Northeast Forestry University Harbin 150040
  • Received:2008-07-31 Revised:1900-01-01 Online:2009-10-25 Published:2009-10-25
  • Supported by:
     

摘要:

采用水热-微波处理方法对榆木成熟材进行软化处理,通过顺纹压缩率、单维和多维弯曲最小曲率半径表征木材软化效果;以XRD,FTIR等方法测定木材表面组成、结晶度变化,分析软化处理对木材顺纹压缩的影响。结果表明: 水热-微波处理可显著增强木材的软化性能,处理后木材中的抽提物几乎完全抽出(1.73%~0.47%),半纤维素发生明显降解,使木质素相对含量得到增加,木材表面羟基数量显著增加;非结晶区微纤丝趋于有序,相对结晶度提高,结晶区表面微纤丝羟基裸露,氢键键合增强,结晶区宽度增加。当采用处理方案为B时,顺纹压缩率最大,单维和多维弯曲时的曲率半径最小。较高的结晶度和适宜的羟基数量是试样B表现出较高软化性能的主要原因。

关键词: 榆木, 水热-微波处理, 木材软化性质, 顺纹压缩

Abstract:

In the present work, hydrothermal-microwave treatment was used for elm dimension-timber softed treatment. Ratio of longitudinal compressing, single and muti-dimensional minimal curvature radius were used to evaluate the softening result. XRD and FTIR were used for the characterization of surface composition and crystallinity. The results show that hydrothermal-microwave treatment can soften elm dimension-timber significantly, the content of extractive and hemicellulose also decreased significantly. The content of lignin increased slightly(1.73%~0.47%). In addition, the number of hydroxyl groups on wood surface increased significantly. For the non-crystalline region, microsoft fiber tended to arrange orderly and increase the degree of crystallinity. In the crystal region, the hydroxyl of the sur-microsoft fiber was exposed and the hydrogen bonding enhanced and the width of crystal region increased. When treated under the optimum condition of scheme B, the ratio of longitudinal compressing reached maximum and the single and muti-dimensional radius reached minimum. The main reason of the best softening performance of sample B was the high degree of crytallinity and appropriate number of hydroxyl.

Key words: elm, hydrothermal-microwave treatment, softening wood properties, longitudinal compressing

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