dc.contributor.author |
El Mansouri, Nour-Eddine |
dc.contributor.author |
Yuan, Qiaolong |
dc.contributor.author |
Huang, Farong |
dc.date |
2013-04-02T14:15:14Z |
dc.date |
2013-04-02T14:15:14Z |
dc.date |
2011 |
dc.identifier.citation |
1930-2126 |
dc.identifier.uri |
http://hdl.handle.net/10256/7685 |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
North Carolina State University |
dc.relation |
© BioResources, 2011, vol. 6, núm. 3, p. 2492-2503 |
dc.relation |
Articles publicats (D-EQATA) |
dc.rights |
Tots els drets reservats |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Lignina |
dc.subject |
Lignin |
dc.subject |
Resines epoxídiques |
dc.subject |
Epoxy resins |
dc.title |
Synthesis and characterization of kraft lignin-based epoxy resins |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/publishedVersion |
dc.description.abstract |
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. 1H-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 ºC 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 |