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Dissolution of cellulose using a combination of hydroxide bases in aqueous solution
Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center. Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden..
2020 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 27, no 1, p. 101-112Article in journal (Refereed) Published
Abstract [en]

In order to further understand the role of the cation when dissolving cellulose in aqueous solutions of hydroxide bases, different bases were combined in solution. Up to 5 wt.% of microcrystalline cellulose was dissolved using a combination of NaOH and the organic base tetramethylammonium hydroxide (TMAH) in water at low temperatures. Thermoscans of solutions containing both NaOH(aq) and TMAH(aq) indicated that cellulose interaction with TMAH seems to be favoured over NaOH. Dynamic rheology measurements of the solutions revealed that combining the two bases delayed gelation significantly when compared to cellulose dissolved in NaOH(aq) or TMAH(aq) alone. Intrinsic viscosity of cellulose in the combined NaOH- and TMAH(aq) solutions was slightly higher than that of the single-base solutions, indicating a slight increase in solvent quality. This shows that combining bases may lead to synergies that improve solvent stability without requiring the use of other additives.

Place, publisher, year, edition, pages
Springer Science and Business Media LLC , 2020. Vol. 27, no 1, p. 101-112
Keywords [en]
Cellulose, Dissolution, Solvent, NaOH, TMAH, Aqueous
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-263339DOI: 10.1007/s10570-019-02780-8ISI: 000490837700001Scopus ID: 2-s2.0-85074564347OAI: oai:DiVA.org:kth-263339DiVA, id: diva2:1375965
Note

QC 20191206

Available from: 2019-12-06 Created: 2019-12-06 Last updated: 2020-05-29Bibliographically approved

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