木材科学与技术2024，Vol.38Issue(4)：36-43,8.DOI:10.12326/j.2096-9694.2024029
桦木酶解磨木木质素分子结构及其拉伸力学性能研究
Molecular Structure and Tensile Mechanical Properties of Birch Enzymatic Lignin
摘要
Abstract
To compensate for the lack of tensile strength-related data on wood pseudo in-situ lignin,this study combines ball milling,weak alkaline pretreatment,and enzymatic methods to extract three types of birch(Betula platyphylla)wood lignin:dual-enzyme lignin(DEL),alkaline-treated triple-enzyme lignin(ATEL),and dual-alkaline-treated dual-enzyme lignin(ADEL).Subsequently,the molecular purity,molecular structure,tensile strength,elastic modulus,Poisson's ratio,and shear modulus of the isolated lignin were tested.The results show that the purities of DEL,ATEL,and ADEL were 48.2%,99.29%,and 97.79%,respectively.ATEL and ADEL cause minimal chemical degradation of in-situ lignin in birch,exhibiting typical infrared spectroscopic features of hardwood lignin,including representative linkage types such as β-O-4 and β-β bonds,making them suitable for use as pseudo in-situ lignin.At 5%water content,the tensile strengths of DEL,ATEL,and ADEL were 17.14,5.38,and 5.62 MPa respectively;the elastic modulus were 7.97,6.36,and 6.23 GPa respectively;the Poisson's ratios were 0.31,0.34,and 0.34 respectively;the calculated shear modulus were 3.04,2.39,and 2.33 GPa respectively.DEL contains a large amount of cellulose and hemicellulose,resulting in higher tensile mechanical properties.ATEL and ADEL test data can be used to evaluate the tensile mechanical properties of in-situ birch lignin.关键词
桦木/酶解磨木木质素/类原位木质素/拉伸力学性能Key words
birch/enzymatic lignin/pseudo in-situ lignin/tensile mechanical properties分类
农业科技引用本文复制引用
周博鑫,戴璐,漆楚生..桦木酶解磨木木质素分子结构及其拉伸力学性能研究[J].木材科学与技术,2024,38(4):36-43,8.基金项目
国家重点研发计划项目"木竹材资源利用的结构与化学机理研究"(2023YFD2200501) （2023YFD2200501）
国家自然科学基金面上项目"基于木材多尺度微观结构的热-重-力学性能响应机制"(31870536). （31870536）
