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。
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.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2009年第10期120-125,共6页
Scientia Silvae Sinicae
基金
国家自然科学基金(30871969
30630052)
黑龙江省攻关课题(GA09B202-07)项目资助
关键词
榆木
水热-微波处理
木材软化性质
顺纹压缩
elm hydrothermal-microwave treatment softening wood properties longitudinal compressing
