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Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose

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 th...

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Autores principales: Swensson, Beatrice, Larsson, Anette, Hasani, Merima
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362248/
https://www.ncbi.nlm.nih.gov/pubmed/32521817
http://dx.doi.org/10.3390/polym12061310
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author Swensson, Beatrice
Larsson, Anette
Hasani, Merima
author_facet Swensson, Beatrice
Larsson, Anette
Hasani, Merima
author_sort Swensson, Beatrice
collection PubMed
description 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.
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spelling pubmed-73622482020-07-21 Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose Swensson, Beatrice Larsson, Anette Hasani, Merima Polymers (Basel) Article 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. MDPI 2020-06-08 /pmc/articles/PMC7362248/ /pubmed/32521817 http://dx.doi.org/10.3390/polym12061310 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Swensson, Beatrice
Larsson, Anette
Hasani, Merima
Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
title Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
title_full Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
title_fullStr Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
title_full_unstemmed Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
title_short Probing Interactions in Combined Hydroxide Base Solvents for Improving Dissolution of Cellulose
title_sort probing interactions in combined hydroxide base solvents for improving dissolution of cellulose
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7362248/
https://www.ncbi.nlm.nih.gov/pubmed/32521817
http://dx.doi.org/10.3390/polym12061310
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