化学成分对木材细胞壁纵向弹性模量和硬度的影响  

Effects of chemical components on longitudinal MOE and hardness of wood cell wall

作　　者：王传贵[1] 江泽慧[2,3] 费本华[2,3] 余雁[2,3] 张双燕[1,3] 

机构地区：[1]安徽农业大学林业与园林学院 [2]国际竹藤中心 [3]国家林业局竹藤科学与技术重点实验室

出　　处：《北京林业大学学报》2012年第3期107-110,共4页Journal of Beijing Forestry University

基　　金：国家自然科学基金重点项目(30730076)

摘　　要：以杉木成熟材晚材为研究对象,采用化学成分选择性脱除方法依次脱除木质素和半纤维素。利用纳米压痕技术,在纳米尺度上,探讨半纤维素和木质素对木材细胞壁压入力学性能的影响。结果表明:木质素对细胞壁的弹性模量影响显著,脱除木质素后细胞壁弹性模量损失了6.53%。半纤维素是一种界面高分子,在细胞壁中作为连接纤维素和木质素的界面偶联剂,对细胞壁的纵向弹性模量影响极显著,脱除半纤维素后细胞壁弹性模量损失约为9.16%。木质素和半纤维素对细胞壁的硬度影响均显著。木质素脱除后,细胞壁硬度降低了16.98%。半纤维素脱除处理与脱木质素处理相比,硬度仅下降了0.87%。In this study, we used targeted modification method to extract lignin and hemicellulose from mature latewood of Chinese fir （Cunninghamia lanceolata （Lamb.） Hook ） successively. We applied nanoindcntation technology to study the effects of hemicellulose and lignin on nano-mechanical properties of wood cell wall at nano-scale. Results showed that lignin influenced the modulus of elasticity （MOE） significantly （at 0.05 level）. The loss of elastic modulus was 6.53% after de-lignifing treatment. Hemicelluloses, which act as an interfacial coupling agent between the highly ordered cellulose of the microfibrils and lignin, affected MOE of cell wall significantly （ at 0.01 level）. The loss of elastic modulus was about 9.16% after being treated with hemicellulose extraction. Hemicellulose and lignin affected the hardness of cell wall significantly （ at 0.05 level）, which decreased with the degradation of hemicellulose or lignin. After de-lignifing treatment, the hardness of cell wall decreased by 16.98%, while it only decreased by 0. 87% after hemicellulose-extracting treatment.

关 键 词：纳米压痕 细胞壁 半纤维素 木质素 弹性模量 硬度 

分 类 号：S781.29[农业科学—木材科学与技术]