Dissolution state of cellulose in aqueous systems. 1. Alkaline solvents

The understanding of the state of dissolution of cellulose in a certain solvent is a critical step forward in the development of new efficient solvent systems for cellulose. Nevertheless, obtaining such information is not trivial. Recently, polarization transfer solid-state NMR (PTssNMR) was shown to be a very promising technique regarding an efficient and robust characterization of the solution state of cellulose. In the present study, combining PTssNMR, microscopic techniques and X-ray diffraction, a set of alkaline aqueous systems are investigated. The addition of specific additives, such as urea or thiourea, to aqueous NaOH based systems as well as the use of an amphiphilic organic cation, is found to have pronounced effects on the dissolution efficiency of cellulose. Additionally, the characteristics of the regenerated material are strongly dependent on the dissolution system; typically less crystalline materials, presenting smoother morphologies, are obtained when amphiphilic solvents or additives are used.

Medronho, BrunoUniv Algarve, Fac Sci & Technol MEDITBIO, Campus Gambelas,Ed 8, P-8005139 Faro, Portugal. (författare)
Antunes, Filipe E.Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal. (författare)
Topgaard, DanielLund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Lund Univ, Ctr Chem & Chem Engn, Dept Chem, Div Phys Chem, S-22100 Lund, Sweden.(Swepub:lu)fk1-dto (författare)
Lindman, BjörnMittuniversitetet,Avdelningen för kemiteknik,Nanyang Technol Univ, Mat Sci & Engn, Singapore 639798, Singapore,FSCN(Swepub:miun)bjorli (författare)
Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal.Univ Algarve, Fac Sci & Technol MEDITBIO, Campus Gambelas,Ed 8, P-8005139 Faro, Portugal. (creator_code:org_t)

Ingår i:Cellulose: Springer Science and Business Media LLC23:1, s. 247-2580969-02391572-882X

Av författaren/redakt...: Alves, Luis; Medronho, Bruno; Antunes, Filipe ...; Topgaard, Daniel; Lindman, Björn

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