通过对杨木乙醇木质素和卡夫木质素进行有序溶剂分馏比较研究木质素的理化特性及其应用

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2024-11-20 DOI:10.1016/j.indcrop.2024.120071

Changgeng Li, Zhongshan Wang, Minjie Hou, Xinyu Cao, Wenchao Jia, Lingzhi Huang, Lu Wu, Bing Wang, Xueru Sheng, Yanzhu Guo, Haiqiang Shi

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引用次数: 0

摘要

木质素分子量分布广，理化性质复杂，是木质素高附加值利用的难题。如何缩小木质素的分子量并阐明与木质素分子量相关的理化性质差异，对于木质素转化加工至关重要。在本研究中，实验室制备的牛皮纸木质素和乙醇木质素通过设计的溶剂系统被分馏成几种分子量分布较窄的组分。比较分析了每种分馏木质素的产率、分子量分布、结构特征及其理化性质。结果表明，乙醇木质素的产率（8.44%）高于牛皮纸木质素的产率（5.26%）。与乙醇木质素（Mw=3682 g/mol，2.10 mmol/g）相比，牛皮纸木质素的分子量较低（Mw=2480 g/mol），羟基含量较高（4.29 mmol/g），β-O-4 和 β-5 键含量较低。同时，乙醇木质素和牛皮纸木质素中的酚羟含量都随着分子量的降低而增加。此外，乙醇木质素的抗氧化活性更高，木质素基聚氨酯弹性体的拉伸强度也远高于牛皮纸木质素基聚氨酯弹性体（65 倍）。

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$Comparative study on the physicochemical characteristics of lignin via sequential solvent fractionation of ethanol and Kraft lignin derived from poplar and their applications$

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Comparative study on the physicochemical characteristics of lignin via sequential solvent fractionation of ethanol and Kraft lignin derived from poplar and their applications

The challenges in high value-added utilization of lignin own to its wide molecular weight distribution and complex physicochemical properties associated with it. How to narrow the molecular weight of lignin and elucidate the differences in physiochemical properties related to molecular weight of lignins is of crucial importance for lignin conversion processing. In this study, lab-made Kraft and ethanol lignins were fractionated into several narrower molecular weight distribution components through a designed solvent system. The yield, molecular weight distribution, structural characterization and their physicochemical properties of each fractionated lignin were analyzed comparatively. The results indicated that the yield of ethanol lignin is higher (8.44 %) than that of Kraft lignin (5.26 %). Kraft lignin shows lower molecular weight (Mw=2480 g/mol), higher hydroxyl content (4.29 mmol/g), and lower content of β-O-4 and β-5 bonds compared to ethanol lignin (Mw=3682 g/mol, 2.10 mmol/g). Meanwhile, the phenolic hydroxyl content in both ethanol and Kraft lignins increased with the decrease of molecular weight. Furthermore, ethanol lignin demonstrated higher antioxidant activity and much higher (65times) tensile strength of lignin-based polyurethane elastomer than that of Kraft lignin-based polyurethane elastomer.

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.