ISWC OpenIR  > 水保所知识产出(1956---)
工业碱木质素羟甲基化改性研究
徐强1,2; 孙倩倩3; 赵新坤3; 曹胜磊3; 佘雕1,2; 孙润仓4
2017
Source Publication林业工程学报
Volume2Issue:3Pages:90-96
Abstract

:羟甲基化可以显著提高碱木质素的羟基含量,是增强木质素反应活性的有效改性方法。为提高碱木质
素的反应活性并分析碱木质素结构变化,笔者通过红外光谱(FTIR)、碳谱(DEPT 135)和异核单量子关系
(HSQC)对羟甲基化木质素和原料木质素的结构分别进行表征,分析碱木质素在羟甲基化反应过程中结构变
化,并对反应过程进行初步探索和验证。研究结果表明:在碱性条件下,木质素对羟基肉桂酸单元(PCA)、阿魏
酸单元(FA)侧链上C7、C8
双键,对羟基苯基单元(H)的C-3、C-5,愈创木基单元(G)的C-5和甲醛发生加成反
应,形成羟甲基,而木质素的其他结构单元,如:紫丁香基单元(S)、β-O-4醚键结构(A)、苯基香豆满(C),并不能
和甲醛发生反应。碱木质素改性的最优条件为:反应温度80℃,反应时间3h,pH为11,m(碱木质素)∶m(甲醛)
为6∶1。在最优条件下得到的羟甲基化碱木质素的羟甲基质量分数为2.32%。本研究结果可为羟甲基化碱木质
素基新材料的进一步研究和开发提供参考。

Other Abstract

Lignin is a natural polymer that can be used as a raw material for the preparation of chemicals and
materials.Hydroxymethylation is an effective modification method to increase the activity of the lignin and
therefore improve the utilization of the lignin.This study compared the structure changes of lignin before and
after the hydroxymethylation reaction to evaluate the improvement of the activity of lignin.The structures of
the hydroxymethylated lignin and the raw lignin were characterized by FTIR,DEPT135 and HSQC.In addition,
the hydroxymethylation reaction was optimized by orthogonal design with altering the conditions
including temperature,time,pH,and the mass ratio of lignin to formaldehyde.The results showed that the C7
and C8 in p-coumaric acid units(PCA)and ferulic acid units(FA),the C3 and C5 in p-hudroxyphenyl units,
and the C5inguaiacyl units(G)reacted with formaldehyde to formhydroxymethyl groups.This hydroxymethylation
reactions mainly included Prings reaction and Lederer-Manasse reaction.However,other units,such as
syringyl units(S),β-O-4 aryl ether linkages(A)and phenylcoumarane substructure(C),did not react with
formaldehydeunder alkaline conditions.The optimal conditions of hydroxymethylation were under the reaction
temperature of 80℃,reaction time of 3 h,the pH of 11 and the mass ratio of alkali lignin to formaldehyde of
6∶1,where the hydroxymethyl content reached2.32%.This study explained the changes in the structure of the
alkali lignin after hydroxymethylation,and the results could be helpful to promote the application of industrial
alkali lignin.

Keyword羟甲基化 碱木质素 核磁共振 游离甲醛 正交试验
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8400
Collection水保所知识产出(1956---)
Affiliation1.中国科学院教育部水土保持与生态环境研究中心黄土高原土壤侵蚀与旱地农业国家重点实验室
2.西北农林科技大学水土保持研究所
3.西北农林科技大学资源环境学院
4.北京林业大学林木生物质化学北京市重点实验室
Recommended Citation
GB/T 7714
徐强,孙倩倩,赵新坤,等. 工业碱木质素羟甲基化改性研究[J]. 林业工程学报,2017,2(3):90-96.
APA 徐强,孙倩倩,赵新坤,曹胜磊,佘雕,&孙润仓.(2017).工业碱木质素羟甲基化改性研究.林业工程学报,2(3),90-96.
MLA 徐强,et al."工业碱木质素羟甲基化改性研究".林业工程学报 2.3(2017):90-96.
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