Superbase ionic liquids for effective cellulose processing from dissolution to carbonisation

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Title: Superbase ionic liquids for effective cellulose processing from dissolution to carbonisation
Authors: Kuzmina, O
Bhardwaj, J
Vincent, SR
Wanasekara, ND
Kalossaka, LM
Griffith, J
Potthast, A
Rahatekar, S
Eichhorn, SJ
Welton, T
Item Type: Journal Article
Abstract: A range of superbase derived ionic liquids (SILs) was synthesised and characterised. Their ability to dissolve cellulose and the characteristics of the produced fibres were correlated to their specific structural and solvent properties. 17 ionic liquids (ILs) (including 9 novel) were analysed and six ILs were selected to produce fibres: 1-ethyl-3-methylimidazolium acetate [C2C1im][OAc], 1-ethyl-3-methylimidazolium diethyl phosphate [C2C1im][DEP] and the SILs 1-ethyl-1,8-diazabicyclo[5.4.0]undec-7-enium diethylphosphate [DBUEt][DEP], 1,8-diazabicyclo[5.4.0]undec-7-enium acetate [DBUH][OAc], 1,5-diazabicyclo[4.3.0]non-5-enium acetate [DBNH][OAc] and 1-ethyl-1,5-diazabicyclo[4.3.0]non-5-enium diethylphsophate [DBNEt][DEP]. The mechanical properties of these fibres were investigated. The obtained fibres were then carbonised to explore possible application as carbon fibre precursors. The fibres obtained using a mixture of 1,5-diazabicyclo[4.3.0]non-5-enium based SILs with acetate and hexanoate anions (9 : 1), [DBNH][OAc][Hex], showed a promising combination of strength, stiffness and strain at failure values for applications in textiles and fibre reinforcement in renewable composites. Using Raman spectroscopy it is demonstrated that these fibres exhibit a relatively high degree of structural order, with fewer defects than the other materials. On the other hand, analogous fibres based on imidazolium cation with acetate and hexanoate anions (9 : 1), [C2C1im][OAc][Hex] showed a decline in the quality of the produced fibres compared to the fibres produced from [C2C1im][OAc], [C2C1im][DEP] or [DBNH][OAc][Hex].
Issue Date: 23-Nov-2017
Date of Acceptance: 17-Nov-2017
ISSN: 1463-9262
Publisher: Royal Society of Chemistry
Start Page: 5949
End Page: 5957
Journal / Book Title: Green Chemistry
Volume: 19
Issue: 24
Copyright Statement: © The Royal Society of Chemistry 2017
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: AERO RB1717
Keywords: Science & Technology
Physical Sciences
Chemistry, Multidisciplinary
Science & Technology - Other Topics
03 Chemical Sciences
Organic Chemistry
Publication Status: Published
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Faculty of Natural Sciences

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