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Dissolution state of cellulose in aqueous systems. 2. Acidic solvents

Alves, Luis; Medronho, Bruno LU ; Antunes, Filipe E. LU ; Topgaard, Daniel LU and Lindman, Björn LU (2016) In Carbohydrate Polymers 151. p.707-715
Abstract

Cellulose is insoluble in water but can be dissolved in strong acidic or alkaline conditions. How well dissolved cellulose is in solution and how it organizes are key questions often neglected in literature. The typical low pH required for dissolving cellulose in acidic solvents limits the use of typical characterization techniques. In this respect, Polarization Transfer Solid State NMR (PT ssNMR) emerges as a reliable alternative. In this work, combining PT ssNMR, microscopic techniques and X-ray diffraction, a set of different acidic systems (phosphoric acid/water, sulfuric acid/glycerol and zinc chloride/water) is investigated. The studied solvent systems are capable to efficiently dissolve cellulose, although degradation occurs to... (More)

Cellulose is insoluble in water but can be dissolved in strong acidic or alkaline conditions. How well dissolved cellulose is in solution and how it organizes are key questions often neglected in literature. The typical low pH required for dissolving cellulose in acidic solvents limits the use of typical characterization techniques. In this respect, Polarization Transfer Solid State NMR (PT ssNMR) emerges as a reliable alternative. In this work, combining PT ssNMR, microscopic techniques and X-ray diffraction, a set of different acidic systems (phosphoric acid/water, sulfuric acid/glycerol and zinc chloride/water) is investigated. The studied solvent systems are capable to efficiently dissolve cellulose, although degradation occurs to some extent. PT ssNMR is capable to identify the liquid and solid fractions of cellulose, the degradation products and it is also sensitive to gelation. The materials regenerated from the acidic dopes were found to be highly sensitive to the solvent system and to the presence of amphiphilic additives in solution.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Acidic solvents, Cellulose ionization, Dissolution, Gelation, Molecular organization, PT ssNMR
in
Carbohydrate Polymers
volume
151
pages
9 pages
publisher
Elsevier
external identifiers
  • Scopus:84975503543
  • WOS:000380943900081
ISSN
0144-8617
DOI
10.1016/j.carbpol.2016.06.015
language
English
LU publication?
yes
id
8d5f53cb-df8b-4f9c-a86c-175375f09201
date added to LUP
2016-10-14 10:14:51
date last changed
2017-01-01 08:36:45
@article{8d5f53cb-df8b-4f9c-a86c-175375f09201,
  abstract     = {<p>Cellulose is insoluble in water but can be dissolved in strong acidic or alkaline conditions. How well dissolved cellulose is in solution and how it organizes are key questions often neglected in literature. The typical low pH required for dissolving cellulose in acidic solvents limits the use of typical characterization techniques. In this respect, Polarization Transfer Solid State NMR (PT ssNMR) emerges as a reliable alternative. In this work, combining PT ssNMR, microscopic techniques and X-ray diffraction, a set of different acidic systems (phosphoric acid/water, sulfuric acid/glycerol and zinc chloride/water) is investigated. The studied solvent systems are capable to efficiently dissolve cellulose, although degradation occurs to some extent. PT ssNMR is capable to identify the liquid and solid fractions of cellulose, the degradation products and it is also sensitive to gelation. The materials regenerated from the acidic dopes were found to be highly sensitive to the solvent system and to the presence of amphiphilic additives in solution.</p>},
  author       = {Alves, Luis and Medronho, Bruno and Antunes, Filipe E. and Topgaard, Daniel and Lindman, Björn},
  issn         = {0144-8617},
  keyword      = {Acidic solvents,Cellulose ionization,Dissolution,Gelation,Molecular organization,PT ssNMR},
  language     = {eng},
  month        = {10},
  pages        = {707--715},
  publisher    = {Elsevier},
  series       = {Carbohydrate Polymers},
  title        = {Dissolution state of cellulose in aqueous systems. 2. Acidic solvents},
  url          = {http://dx.doi.org/10.1016/j.carbpol.2016.06.015},
  volume       = {151},
  year         = {2016},
}