Molecular Structure and Tensile Mechanical Properties of Birch Enzymatic Lignin

ZHOU Boxin; DAI Lu; QI Chusheng

doi:10.12326/j.2096-9694.2024029

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Molecular Structure and Tensile Mechanical Properties of Birch Enzymatic Lignin
Key Laboratory of Wood Material Science and Application （Beijing Forestry University），Beijing 100083，China
Vol. 38, Issue 4, Pages: 36-43(2024)
Published： 30 July 2024 ，
DOI： 10.12326/j.2096-9694.2024029
稿件说明：

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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(04):36-43.

ZHOU Boxin,DAI Lu,QI Chusheng.Molecular Structure and Tensile Mechanical Properties of Birch Enzymatic Lignin[J].Chinese Journal of Wood Science and Technology,2024,38(04):36-43.
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(04):36-43. DOI： 10.12326/j.2096-9694.2024029.

ZHOU Boxin,DAI Lu,QI Chusheng.Molecular Structure and Tensile Mechanical Properties of Birch Enzymatic Lignin[J].Chinese Journal of Wood Science and Technology,2024,38(04):36-43. DOI： 10.12326/j.2096-9694.2024029.

摘要

为弥补木材类原位木质素拉伸力学性能相关数据的缺失，研究采用球磨、弱碱预润胀以及酶解相结合的方法提取三种桦木（

Betula platyphylla

）酶解磨木木质素，分别为：双酶解木质素（dual-enzyme lignin，DEL）、预润胀三酶解木质素（alkaline-treated triple-enzyme lignin，ATEL）和双预润胀双酶解木质素（dual-alkaline-treated dual-enzyme lignin，ADEL），并测试木质素的纯度、分子结构、抗拉强度、弹性模量、泊松比和剪切模量。结果表明：DEL、ATEL、ADEL的纯度分别为48.2%、99.29%、97.79%。ATEL和ADEL对桦木原位木质素的化学结构破坏较少，其表现出阔叶树材木质素典型的红外光谱特征，具有代表性连接键β-O-4键和β-β键，可以视为原位木质素。在含水率为5%的条件下，DEL、ATEL和ADEL的抗拉强度分别为17.14、5.38和5.62 MPa，弹性模量分别为7.97、6.36和6.23 GPa，泊松比分别为0.31、0.34和0.34，计算的剪切模量分别为3.04、2.39和2.33 GPa。DEL中存在大量纤维素和半纤维素，其拉伸力学性能偏高，ATEL和ADEL测试数据可用于评估桦木原位木质素的拉伸力学性能。

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

Keywords

birchenzymatic ligninpseudo in-situ lignintensile mechanical properties

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