水热-微波软化处理对水曲柳弯曲的影响

Effect of Hydrothermal-Microwave Softened Treatment on Bending Ash Wood

采用水热-微波处理方法对水曲柳幼龄材和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和弯曲曲率的影响。结果表明:水热-微波处理可显著增强木材的软化性能,使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。当水煮处理时间为140～150min、微波处理时间为350s时,试材顺纹压缩率最大,单维和多维弯曲时的曲率半径最小。

In the present work, hydrothermal-microwave treatment was used for juvenile and mature ash wood softened treatment. Ratio of longitudinal compressing, single and multi-dimensional minimal curvature radius were used to evaluate the softening result. XRD and FTIR were used for the characterization of surface composition and erystallinity, analyzing the effect of softened treatment on longitudinal compressing and bending curvature ash wood. The results showed hydrothermal-microwave treatment could soften ash wood and increase the number of hydroxyl groups on wood surface significantly. And it also led to microfibre tended to arrange orderly and the degree of crystallinity increased in the non- crystalline region , the hydroxyl of the sur-mierofibre exposed, the hydrogen bonding enhanced and the width of crystal region increased in the crystal region. When the time of hydrothermal and microwave treatment is 140 - 150 min and 350 s respectively, the ratio of longitudinal compressing reached maximum, and the single and multi-dimensional radius reached minimum.