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Dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide
RISE - Research Institutes of Sweden, Material och produktion, IVF.ORCID-id: 0000-0003-4765-8224
Lund University, Sweden.
Lund University, Sweden.
RISE - Research Institutes of Sweden, Material och produktion, IVF.ORCID-id: 0000-0002-5212-780x
Visa övriga samt affilieringar
2016 (Engelska)Ingår i: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016, s. 15-18, artikel-id 1Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
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 1 Hand 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.

Ort, förlag, år, upplaga, sidor
2016. s. 15-18, artikel-id 1
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
URN: urn:nbn:se:ri:diva-30217OAI: oai:DiVA.org:ri-30217DiVA, id: diva2:1129610
Konferens
7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, November 15-16, 2016, Örnsköldsvik, Sweden
Tillgänglig från: 2017-08-04 Skapad: 2017-08-04 Senast uppdaterad: 2019-06-28Bibliografiskt granskad

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Idström, AlexanderOlsson, CarinaKöhnke, Tobias

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