Location of Repository

Cellulose modification using ionic liquids

By Thomas James Bell


This is a duplicate record. Please go to the original at http://hdl.handle.net/2381/4722The aim of this project was to investigate ways of chemically modifying cellulose using ionic liquids. Cellulose is a readily available, naturally occurring, polymeric carbohydrate which is ideal for chemical modification owing to the high density of its functional groups. However, it is insoluble in all common organic solvents. Therefore, interest has recently turned to the use of a novel class of solvents, ionic liquids, which have been found to dissolve cellulose. Initially, studies were undertaken into the acylation of simple carbohydrates using a Lewis acidic choline based ionic liquid, (ZnCl 2)2ChCl. It was found that the yields obtained were comparable to those achieved when traditional solvents and catalysts have been used. It was also found that when only one equivalent of acylating agent was used, all of the carbohydrate hydroxyl groups were acylated. This was thought to be unique to this ionic liquid system. The acetylation of cellulose was also studied in (ZnCl2)2ChCl. Here, it was discovered that the ionic liquid alters the morphology of cellulose by wetting or dissolution thus enabling a range of acetylated products to be produced. Research into the cationic modification of cellulose in an ionic liquid based on chlorcholine chloride (ClChCl) and urea was also undertaken. In this case, it was found that the ionic liquid could act as both the reagent and solvent. It was shown using this system, that all the available (surface) hydroxyl groups on cellulose were modified and that the material produced was significantly more hydrophilic than unmodified cellulose. Finally, preliminary investigations were untaken into other potential surface modifications of cellulose in ionic liquids

Publisher: University of Leicester
Year: 2006
OAI identifier: oai:lra.le.ac.uk:2381/29976

Suggested articles



  1. 4 Cellulose modified with anionic groups CHAPTER 6. Further surface modifications o f cellulose
  2. (1996). A.; Journal o f Colloid and Interface Science, doi
  3. (2006). Abstracts o f Papers,
  4. (1994). American Dyestuff Reporter,
  5. (1968). An Introduction to the Chemistry o f Carbohydrates, doi
  6. (2003). Ant Chent Soc..
  7. (2002). Carbohydrate Chemistry, Oxford Chemistry Primer, doi
  8. Cellulose Derivatives: Modification, Characterization and Nanostructures, doi
  9. (2004). Chemistry in Alternative Reaction Media, doi
  10. (2005). Current Organic Synthesis, doi
  11. (1996). Frontier Orbitals and Organic Chemical Reactions, doi
  12. (2006). Journal o f Applied Polymer Science,
  13. (1996). Magnetism: A Supramolecular function, doi
  14. (2005). MChem Report, University o f Leicester,
  15. (2005). org/wiki/Chito san. COMMUNICATION w vm .rsc .org /green ch em |Green Chemistry O-Acetylation of cellulose and monosaccharides using a zinc based ionic liquidt
  16. (1999). Protective Groups in Organic Synthesis, WileyInterscience, 3rd edn, doi
  17. (2004). ScL and Technol., doi
  18. (1971). Stereochemistry o f Carbohydrates, doi
  19. Surface Analysis, The Principal Techniques, doi
  20. unpublished work,
  21. (1989). Vogel’s Textbook o f Practical Organic Chemistry, doi
  22. W avefunction Inc.,

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.