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Dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide
Swerea IVF.
Lund University.
Lund University.
Swerea IVF.
Show others and affiliations
2016 (English)In: The 7th workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

The dissolution of cellulose in tetrabutylammonium acetate (TBAAc)/dimethyl sulfoxide (DMSO) was studied combining experimental and simulation techniques. It was found that the dissolution limit at 40 °C corresponded to a molar ratio close to one acetate per cellulose anhydroglucose units. MD simulations suggested that the acetate ions bind to cellulose by dual hydrogen bonds. This effectively turns cellulose into a polyelectrolyte, attracting the bulky tetrabutylammonium (TBA+) counter ions, which prevent close contact between chains in the dissolved state. This hypothesis was tested by 1H- and 13C-NMR spectroscopy, which confirmed that acetate forms hydrogen bonds to cellulose, and by diffusion NMR spectroscopy, which demonstrated a strong dynamic correlation between bound acetate and tetrabutylammonium in near-quantitative agreement with simulation. The present results suggest that offering hydrogen bonding to the acetate ions is the main driving force for dissolving cellulose and that the TBA+ counter ions form a diffuse layer around the acetate-decorated cellulose chains.

Place, publisher, year, edition, pages
2016.
Keywords [en]
cellulose, dissolution
National Category
Other Chemistry Topics
Identifiers
URN: urn:nbn:se:umu:diva-128300OAI: oai:DiVA.org:umu-128300DiVA, id: diva2:1051150
Conference
The 7th workshop on cellulose, regenerated cellulose and cellulose derivatives
Available from: 2016-12-01 Created: 2016-12-01 Last updated: 2016-12-01

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Citation style
  • apa
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