Cellulose solutions in aqueous hydroxide bases
Licentiate thesis, 2020
Therefore, the purpose of this thesis has been to improve understanding for interactions governing cellulose dissolution and behaviour in NaOH(aq) and other aqueous solutions of hydroxide bases. In order to achieve this, cellulose dissolution at low temperatures in an aqueous solution of NaOH, combined with selected quatenary ammonium hydroxide bases, tetramethylammonium hydroxide (TMAH) and benzyltrimethylammonium hydroxide (Triton B), as well as urea, have been inves- tigated. The impact of different solvent combinations on the maximum dissolution capacity of cellulose and the rheology of the solutions were also investigated. The structure of the solvents was studied using spectroscopic and calorimetric methods. It was found that by combining hydroxide bases in an aqueous solution, the dissolution capacity and stability of the solution was improved and the effect was comparable to the addition of urea. The resulting solution properties depended on the base pair employed, probably due to a difference in contribution of hydrogen bonding versus van der Waals interactions, which in turn determines such properties as the temperature stability of the solution.
quaternary ammonium hydroxide
Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering
Dissolution of cellulose using a combination of hydroxide bases in aqueous solution
Cellulose,; Vol. 27(2020)p. 101-112
Probing interactions in combined hydroxide base solvents for improving dissolution of cellulose
Polymers,; Vol. 12(2020)
Turning the cold NaOH(aq) into a powerful processing system for cellulose by utilizing its abundance of CO2 - a step towards sustainable textile processes
Formas, 2017-01-01 -- 2019-12-31.
Paper, Pulp and Fiber Technology
Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 2020:04
Chalmers University of Technology
Opponent: Tobias Köhnke, RISE, Sweden