文献类型：期刊文献

英文题名：SYNTHESIS AND CHARACTERIZATION OF KRAFT LIGNIN-BASED EPOXY RESINS

作者：El Mansouri, Nour-Eddine[1];Yuan, Qiaolong[1];Huang, Farong[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：6

期号：3

起止页码：2492

外文期刊名：BIORESOURCES

收录：;EI(收录号：20113314235433);WOS:【SCI-EXPANDED(收录号:WOS:000295864500018)】；

基金：Authors wish to thank the support of the Commission for Universities and Research of the DIUiE of the Generalitat of Catalonia and the company Henkel KGaA.

语种：英文

外文关键词：Lignin; Hydroxymethylation; Glyoxalation; Epoxidization; Epoxy resin

摘要：Epoxidization is an interesting way to develop a new application of lignin and therefore to improve its application potential. In this work, kraft lignin-based epoxy resins were obtained by the epoxidization reaction, using the kraft lignin recovered directly from pulping liquor and modified by a methylolation reaction. The methylolated lignins were obtained by the reaction of original kraft lignin with formaldehyde and glyoxal, which is a less volatile and less toxic aldehyde. (1)H-NMR spectroscopy showed that methylolated kraft lignin has more hydroxymethyl groups than glyoxalated kraft lignin. For the epoxidization reaction we studied the influence of the lignin: NaOH (w/w) ratio, temperature, and time of the reaction on the properties of the prepared epoxidized lignins. The structures of lignin-based epoxy resins were followed by epoxy index test and FTIR spectroscopy. Optimal conditions were obtained for lignin-based epoxy resin produced at lignin/NaOH = 1/3 at 70 degrees C for 3h. Thermogravimetry analysis (TGA) revealed that the epoxidization enhances the thermal stability of lignins and may allow a wider temperature range for applications with lignin epoxy-PF blends.