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| 木质素脱甲基化改性及产物结构表征 | |
| 引用本文： | 胡立红,周永红,潘晖,张猛,刘瑞杰. 木质素脱甲基化改性及产物结构表征[J]. 高分子通报, 2012, 0(3): 77-84 |
| 作者姓名： | 胡立红 周永红 潘晖 张猛 刘瑞杰 |
| 作者单位： | 1. 中国林业科学研究院林产化学工业研究所；生物质化学利用国家工程实验室；国家林业局林产化学工程重点开放性实验室；江苏省生物质能源与材料重点实验室南京210042／中国林业科学研究院林业新技术研究所,北京100091 2. 中国林业科学研究院林产化学工业研究所；生物质化学利用国家工程实验室；国家林业局林产化学工程重点开放性实验室；江苏省生物质能源与材料重点实验室南京210042 3. 路易斯安那州立大学农业研究中心,Calhoun,LA71225,USA |
| 基金项目： | 林业公益性行业科研专项，林业科学技术推广项目 |
| 摘 要： | 通过对不同催化剂、催化剂量、反应温度和反应时间等反应条件下得到的改性木质素与甲醛反应活性的研究,确定了木质素脱甲基化反应条件,并通过FT-IR半定量、GPC1、H NMR对木质素脱甲基化前后结构进行表征。FT-IR半定量表明木质素甲氧基由反应前的0.990降至0.765,酚羟基由1.174增至1.529;GPC表明木质素脱甲基化后大分子木质素发生了降解,分子量小于2000的木质素含量由由改性前的38%增至改性后的51%;1H NMR表明木质素改性后脂肪族侧链与苯环分离,同时大量-βO-4醚键裂解。 |
| 关 键 词： | 木质素 脱甲基化 反应活性 结构表征题 |
Study on Lignin Demethylation and Structural Characterization of its Products |
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| HU Li-hong,ZHOU Yong-hong,PAN Hui,ZHANG Meng,LIU Rui-jie. Study on Lignin Demethylation and Structural Characterization of its Products[J]. Polymer Bulletin, 2012, 0(3): 77-84 | |
| Authors: | HU Li-hong ZHOU Yong-hong PAN Hui ZHANG Meng LIU Rui-jie |
| Affiliation: | 1(1.Institute of Chemical Industry of Forestry Products,CAF;National Engineering Lab.for Biomass ChemicalUtilization;Key Lab.on Forest Chemical Engineering,SFA,Key Lab of Biomass Energy and Material,Jiangsu Province;Nanjing 210042,China;2.Institute of Forest New Technology,CAF,Beijing 100091,China;3.Calhoun Research Station,Louisiana State University Agricultural Center,321Hwy 80E,Calhoun,LA 71225,USA) |
| Abstract: | Optimal lignin demethylation conditions were determined through demethylated lignin reactive activity toward formaldehyde,in terms of variation of catalyst,amount of catalyst,reaction temperature and reaction time.Lignin and its demethylated derivate product were characterized by semiquantitative FT-IR,GPC,and 1H NMR.Results demonstrate that the content of methoxy group decreases from 0.990 to 0.765,and the content of phenolic hydroxyl group increases from 1.174 to 1.529 via semiquantitative FT-IR.GPC results indicate that macromolecular lignin degrades after demethylation,the content of Mw below 2000 dramatically increases from 38% to 51%.1H NMR shows that alkyl chain breaks from benzene ring and β-O-4 linkages cleave and almost disappear after demethylateion. |
| Keywords: | Lignin Demethylation Reactive activity Structural characterization |
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