Cellulose dissolution and regeneration using a non-aqueous, non-stoichiometric protic ionic liquid system

Laura Berga; Isobel Bruce; Thomas Nicol; Ashley J. Holding; Noriyuki Isobe; Seishi Shimizu; Adam J. Walker; Joshua Elias Samuel James Reid

doi:10.1007/s10570-020-03444-8

Cellulose dissolution and regeneration using a non-aqueous, non-stoichiometric protic ionic liquid system

Laura Berga, Isobel Bruce, Thomas Nicol, Ashley J. Holding, Noriyuki Isobe, Seishi Shimizu, Adam J. Walker, Joshua Elias Samuel James Reid

Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

The solubility of cellulose has been studied as a function of composition in the binary mixture of 1,1,3,3-tetramethylguanidine and propionic acid. In amine-rich compositions, greater quantities of cellulose can be dissolved than in the equimolar composition, a.k.a. the protic ionic liquid [TMGH][OPr]. By applying a methodology of a short period of heating followed by cooling, similar concentrations of cellulose can be achieved in a much shorter time period. Finally, regeneration of cellulose from solution can be achieved by altering the acid:amine molar ratio. In comparison to cellulose regenerated from these solutions using water as an antisolvent, cellulose regenerated with propionic acid exhibit a lower crystallinity as inferred from x-ray diffractometry, but a greater average molecular weight as inferred from gel permeation chromatography.

Original language	English
Pages (from-to)	9593–9603
Number of pages	11
Journal	Cellulose
Volume	27
Early online date	12 Sept 2020
DOIs	https://doi.org/10.1007/s10570-020-03444-8
Publication status	Published - 1 Nov 2020

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©The Author(s) 2020.

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title = "Cellulose dissolution and regeneration using a non-aqueous, non-stoichiometric protic ionic liquid system",

abstract = "The solubility of cellulose has been studied as a function of composition in the binary mixture of 1,1,3,3-tetramethylguanidine and propionic acid. In amine-rich compositions, greater quantities of cellulose can be dissolved than in the equimolar composition, a.k.a. the protic ionic liquid [TMGH][OPr]. By applying a methodology of a short period of heating followed by cooling, similar concentrations of cellulose can be achieved in a much shorter time period. Finally, regeneration of cellulose from solution can be achieved by altering the acid:amine molar ratio. In comparison to cellulose regenerated from these solutions using water as an antisolvent, cellulose regenerated with propionic acid exhibit a lower crystallinity as inferred from x-ray diffractometry, but a greater average molecular weight as inferred from gel permeation chromatography.",

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AU - Berga, Laura

AU - Bruce, Isobel

AU - Nicol, Thomas

AU - Holding, Ashley J.

AU - Isobe, Noriyuki

AU - Shimizu, Seishi

AU - Walker, Adam J.

AU - Reid, Joshua Elias Samuel James

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AB - The solubility of cellulose has been studied as a function of composition in the binary mixture of 1,1,3,3-tetramethylguanidine and propionic acid. In amine-rich compositions, greater quantities of cellulose can be dissolved than in the equimolar composition, a.k.a. the protic ionic liquid [TMGH][OPr]. By applying a methodology of a short period of heating followed by cooling, similar concentrations of cellulose can be achieved in a much shorter time period. Finally, regeneration of cellulose from solution can be achieved by altering the acid:amine molar ratio. In comparison to cellulose regenerated from these solutions using water as an antisolvent, cellulose regenerated with propionic acid exhibit a lower crystallinity as inferred from x-ray diffractometry, but a greater average molecular weight as inferred from gel permeation chromatography.

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