Anionically Stabilized Cellulose Nanofibrils through Succinylation Pretreatment in Urea–Lithium Chloride Deep Eutectic Solvent. Issue 21 (14th October 2016)

• Record Type: Journal Article
• Authors: Selkälä, Tuula; Sirviö, Juho Antti; Lorite, Gabriela S.; Liimatainen, Henrikki
• Is Part Of: ChemSusChem. Volume 9:Issue 21(2016:Nov.)
• Page Start: 3074
• Page End: 3083
• Publication Date: 2016-10-14
• Subjects: biomass -- carbohydrates -- nanostructures -- gels -- solvent effects; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201600903
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: Deep eutectic solvents (DESs) are green chemicals that have the potential to replace traditional solvents in chemical reactions. In this study, urea–LiCl DES was used successfully as a reaction medium in the anionic functionalization of wood cellulose with succinic anhydride. The effects of reaction temperature and time on the carboxyl content and yield were evaluated. The analyses of the degree of polymerization and crystallinity revealed that the DES was a nondegrading and nondissolving reaction medium. Three samples with the highest carboxyl contents were further nanofibrillated with a microfluidizer to diameters of 2–7 nm, as observed by atomic force microscopy. Samples treated at 70–80 °C for 2 h gave the best outcome and resulted in highly viscose and transparent gels. The sample treated at 90 °C contained larger nanoparticles and larger aggregates owing to the occurrence of possible side reactions but resulted in better thermal stability. Abstract : Rolling in the deep : Urea–LiCl deep eutectic solvent is used successfully as an alternative reaction medium for the succinylation of dissolving cellulose pulp. The consequent mechanical disintegration of the functionalized fibers results in the formation of a highly viscose and transparent gel containing a network of anionic cellulose nanofibrils with diameters of 2–7 nm.