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Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
Chalmers Univ Technol, Dept Chem & Chem Engn, SE-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, SE-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, SE-41296 Gothenburg, Sweden..ORCID iD: 0000-0002-2501-9918
2020 (English)In: Polymers, E-ISSN 2073-4360, Vol. 12, no 6, article id 1310Article in journal (Refereed) Published
Abstract [en]

To further understand cellulose-solvent interactions in aqueous hydroxide solutions, cellulose behavior in aqueous solutions of NaOH combined with tetramethylammonium hydroxide (TMAH) or benzyltrimethylammonium hydroxide (Triton B), as well as urea, was investigated. The rheological properties of the solutions were assessed through flow sweeps at different temperatures, and the intermolecular interactions were probed using solvatochromic dyes. The results showed that NaOH combined with TMAH had synergistic effects on cellulose dissolution and was a better solvent for cellulose than the combination of NaOH with Triton B, in spite of the superior dissolution ability of Triton B alone. This somewhat unexpected finding shows that the base pair needs to be selected with care. Interestingly, addition of urea had no significant effect on the solvatochromic parameters or dissolution capacity of solutions of Triton B but rendered improved stability of solutions containing NaOH and/or TMAH. It seems that both urea and Triton B weaken the hydrophobic assembly effect of these solutions, but urea is excluded from interacting with cellulose in the presence of Triton B. This study provides further insight into dissolution of cellulose and the possibility of utilizing combinations of hydroxide bases to achieve improved solution properties.

Place, publisher, year, edition, pages
MDPI , 2020. Vol. 12, no 6, article id 1310
Keywords [en]
cellulose, dissolution, aqueous, NaOH, hydroxide base, Kamlet-Taft, solvatochromic
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-279189DOI: 10.3390/polym12061310ISI: 000553884800001PubMedID: 32521817Scopus ID: 2-s2.0-85087732961OAI: oai:DiVA.org:kth-279189DiVA, id: diva2:1465166
Note

QC 20200909

Available from: 2020-09-09 Created: 2020-09-09 Last updated: 2024-01-17Bibliographically approved

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Hasani, Merima

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