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

Alves, LuisUniv Coimbra, Dept Chem, P-3004535 Coimbra, Portugal.,University of Coimbra (författare)

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.

Medronho, BrunoUniv Algarve, Fac Sci & Technol MEDITBIO, Campus Gambelas,Ed 8, P-8005139 Faro, Portugal.,University of Algarve, Portugal(Swepub:lu)fkem-bme (författare)
Antunes, Filipe E.Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal.,University of Coimbra(Swepub:lu)fkem-fan (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(Swepub:lu)fk1-dto (författare)
Lindman, BjörnMid Sweden University,Mittuniversitetet,Avdelningen för kemiteknik,Nanyang Technol Univ, Mat Sci & Engn, Singapore 639798, Singapore,Nanyang Technological University(Swepub:lu)fk1-bli (författare)
Univ Coimbra, Dept Chem, P-3004535 Coimbra, Portugal.University of Coimbra (creator_code:org_t)

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

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