Bio-Polyurethane Resins Derived from Liquid Fractions of Lignin for the Modification of Ramie Fibers

Pub Date : 2021-04-08 DOI:10.23960/JSL29223-238
Manggar Arum Aristri, M. A. R. Lubis, R. P. B. Laksana, F. Falah, W. Fatriasari, M. Ismayati, A. P. Wulandari, N. Nurindah, Muhammad Rasyidur Ridho
{"title":"Bio-Polyurethane Resins Derived from Liquid Fractions of Lignin for the Modification of Ramie Fibers","authors":"Manggar Arum Aristri, M. A. R. Lubis, R. P. B. Laksana, F. Falah, W. Fatriasari, M. Ismayati, A. P. Wulandari, N. Nurindah, Muhammad Rasyidur Ridho","doi":"10.23960/JSL29223-238","DOIUrl":null,"url":null,"abstract":"In this study, technical lignin from black liquor was used as a pre-polymer for the preparation of bio-polyurethane (Bio-PU) resins. Briefly, the isolated lignin was fractionated using ethyl acetate (EtAc) and methanol (MeOH). The liquid fractions of lignin, such as lignin-EtAc (L-EtAc) and lignin-methanol (L-MeOH), were mixed with 10% of polymeric isocyanate (based on the weig ht of liquid fractions) to obtain Bio-PU resins. The isolate d lignin, fractionated lignin, and lignin-derived Bio-PU resins were characterized using several techniques. The obtained Bio-PU resins were then used to modify ramie fibers using vacuum impregnation method. Fourier Transform Infrared (FTIR) spectroscopy, Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA) revealed that the isolated lignin had quite similar characteristics to the lignin standar d . Fractionation of lignin with EtAc and MeOH altered its characteristics. FTIR, DSC, and TGA showed that solid fractions of lignin had similar characteristics to lignin standard and isolated lignin, while the liquid fractions had characteristics from lignin and the solvents. The absorption band of isocyanate (−N=C=O) groups was shifted to 2285 cm −1 from 2240 cm −1 owing to the reaction with the −OH groups in lignin, forming urethane (R−NH−C=O−R) groups at 1605 cm −1 in Bio-PU resins. Thermal properties of Bio-PU resins derived from L-EtAc exhibited greater endothermic reaction compared to Bio-PU-L-MeOH. As a result, the free −N=C=O groups in Bio-PU resins have reacted with –OH groups on the surface of ramie fibers and improved its thermal properties. Modification of ramie fibers with Bio-PU resins improved the fibers’ thermal stability by 15% using Bio-PU-LEtAc for 60 min of impregnation. Keywords:  Bio-polyurethane resins, Impregnation, Lignin fractions, Ramie fibers, Thermal stability","PeriodicalId":0,"journal":{"name":"","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.23960/JSL29223-238","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8

Abstract

In this study, technical lignin from black liquor was used as a pre-polymer for the preparation of bio-polyurethane (Bio-PU) resins. Briefly, the isolated lignin was fractionated using ethyl acetate (EtAc) and methanol (MeOH). The liquid fractions of lignin, such as lignin-EtAc (L-EtAc) and lignin-methanol (L-MeOH), were mixed with 10% of polymeric isocyanate (based on the weig ht of liquid fractions) to obtain Bio-PU resins. The isolate d lignin, fractionated lignin, and lignin-derived Bio-PU resins were characterized using several techniques. The obtained Bio-PU resins were then used to modify ramie fibers using vacuum impregnation method. Fourier Transform Infrared (FTIR) spectroscopy, Differential Scanning Calorimetry (DSC), and Thermogravimetric Analysis (TGA) revealed that the isolated lignin had quite similar characteristics to the lignin standar d . Fractionation of lignin with EtAc and MeOH altered its characteristics. FTIR, DSC, and TGA showed that solid fractions of lignin had similar characteristics to lignin standard and isolated lignin, while the liquid fractions had characteristics from lignin and the solvents. The absorption band of isocyanate (−N=C=O) groups was shifted to 2285 cm −1 from 2240 cm −1 owing to the reaction with the −OH groups in lignin, forming urethane (R−NH−C=O−R) groups at 1605 cm −1 in Bio-PU resins. Thermal properties of Bio-PU resins derived from L-EtAc exhibited greater endothermic reaction compared to Bio-PU-L-MeOH. As a result, the free −N=C=O groups in Bio-PU resins have reacted with –OH groups on the surface of ramie fibers and improved its thermal properties. Modification of ramie fibers with Bio-PU resins improved the fibers’ thermal stability by 15% using Bio-PU-LEtAc for 60 min of impregnation. Keywords:  Bio-polyurethane resins, Impregnation, Lignin fractions, Ramie fibers, Thermal stability
分享
查看原文
以木质素液体馏分为原料制备改性苎麻纤维用生物聚氨酯树脂
本研究以黑液中的工艺木质素为预聚物,制备生物聚氨酯树脂。简单地说,分离得到的木质素用乙酸乙酯(EtAc)和甲醇(MeOH)进行分馏。将木质素的液体组分,如木质素- etac (L-EtAc)和木质素-甲醇(L-MeOH)与10%的聚合物异氰酸酯(根据液体组分的重量)混合,得到Bio-PU树脂。采用多种技术对分离木质素、分离木质素和木质素衍生的Bio-PU树脂进行了表征。得到的Bio-PU树脂采用真空浸渍法对苎麻纤维进行改性。傅里叶变换红外光谱(FTIR)、差示扫描量热法(DSC)和热重分析(TGA)表明,分离得到的木质素与标准木质素具有非常相似的特征。木质素与乙酸乙酯和甲醇的分馏改变了木质素的性质。FTIR、DSC和TGA分析表明,木质素固体组分具有与木质素标准组分和分离木质素相似的特征,而液体组分具有木质素和溶剂的特征。在Bio-PU树脂中,异氰酸酯(- N=C=O)基团与木质素中的- OH基团反应,在1605 cm−1处形成氨基甲酸乙酯(R - NH - C=O - R)基团,吸收带由2240 cm−1移动到2285 cm−1。与Bio-PU- l - meoh相比,L-EtAc衍生的Bio-PU树脂的热性能表现出更大的吸热反应。结果表明,Bio-PU树脂中游离的−N=C=O基团与苎麻纤维表面的-OH基团发生反应,改善了苎麻纤维的热性能。用Bio-PU- letac浸渍60 min,用Bio-PU树脂改性苎麻纤维,使纤维的热稳定性提高15%。关键词:生物聚氨酯树脂,浸渍,木质素组分,苎麻纤维,热稳定性
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信