摘要
为探讨刺槐木材受热变色的原因,采用红外光谱和紫外光谱分析了刺槐磨木木素结构受热后官能团的变化。结果表明,刺槐木素受热后共轭羰基、酚羟基增多并且有醌型结构产生;光谱吸收带红移,可见光区吸收峰强度增加。与用水蒸气加热处理相比,在干燥条件下加热后木素结构变化相对较小。刺槐木素受热处理后结构中共轭体系的增大是木材木素变色的重要原因。
To investigate the mechanism of discoloration of black locus wood during thermal treatment process, the variations of functional groups in the lignin of black locust are studied by FTIR and UV-Vis. The results show that, after thermal treatment, the quinonoid structure is formed and the conjugated carboxide and phenolic hydroxyl are increased;the spectral absorption is red-shifted in ultraviolet band and the intesity in the visible region is intensified. The structure alteration of the lignin treated with saturated steam is more than that heated in dry condition. The extending of the conjugated unsaturated system after thermal treatment is most possibly the elemental reason for the lignin discoloration.
出处
《林业科技开发》
2008年第4期67-69,共3页
China Forestry Science and Technology
基金
国家自然科学基金"木材在干燥过程中的诱发变色机理"(编号:30671633)
