摘要
为从微观力学角度揭示木材化学成分对细胞壁纵向静态和动态黏弹性的影响机制,丰富木材细胞壁力学性能研究内容并为纤维选择性利用提供参考。该文以马尾松木材横截面2/3处晚材细胞壁为研究对象,通过化学方法分步除去细胞壁半纤维素和木质素,利用NREL’S LAPS方法计算纤维素、半纤维素和木质素含量,采用傅里叶变换红外光谱(Fourier Transform Infrared Spectroscopy,FTIR)分析木材细胞壁化学成分变化情况,应用纳米压痕技术测定木材细胞壁蠕变柔量、储存模量和损耗模量等力学性能,运用Burgers模型探究细胞壁静态黏弹性与化学成分的关系。结果表明,纤维素对木材细胞壁静态黏弹性起主导作用;木材抽提物对细胞壁黏弹性影响较小;半纤维素和木质素对细胞壁动态黏弹性影响显著,去除半纤维素和木质素后细胞壁储存模量分别降低17.4%和49.4%,损耗模量则增加。
In order to reveal the influence mechanism of wood chemical composition on longitudinal static and dynamic viscoelasticity of cell wall from the perspective of micromechanics,enrich the research content of mechanical properties of wood cell wall and provide reference for selective fiber utilization,wood cell wall at 2/3 of the cross section of Pinus massoniana wood was taken as the research object.Hemicellulose and lignin in cell wall were removed step by step by chemical method,and the contents of cellulose,hemicellulose and lignin were measured by NREL’S LAPS.The changes of chemical composition of wood cell wall were analyzed by Fourier transform infrared spectroscopy.The mechanical properties such as creep compliance,storage modules and loss modulus of wood cell wall were measured by nano indentation technology.Then,the relationship between the static viscoelastic properties of wood cell wall and chemical components was studied using Burgers model.The results showed that cellulose played a leading role in the static viscoelastic properties of wood cell walls.Wood extract had little effect on the viscoelasticity of cell wall.The effects of hemicellulose and lignin on the dynamic viscoelasticity of cell wall were significant.After removing hemicellulose and lignin,the storage modulus of cell wall was reduced by 17.4% and 49.4%,respectively,while the loss modulus was increased.
作者
蔡绍祥
黄燕萍
李朱锋
李延军
CAI Shaoxiang;HUANG Yanping;LI Zhufeng;LI Yanjun(Architectural Engineering Institute,Nantong Institute of Technology,Nantong 226002,China;College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China;School of Textile Garment and Design,Changshu Institute of Technology,Changshu 215500,China)
出处
《森林工程》
北大核心
2022年第3期54-62,共9页
Forest Engineering
基金
国家自然科学基金项目(31570552)
南通市科技项目(JCZ21083)。
关键词
化学成分
木材细胞壁
蠕变柔量
动态黏弹性
储存模量
损耗模量
Chemical component
wood cell wall
creep compliance
dynamic viscoelasticity
storage modulus
loss modulus
