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Microstructures of ...
Microstructures of cellulose coagulated in water and alcohols from 1-ethyl-3-methylimidazolium acetate : contrasting coagulation mechanisms
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- Hedlund, Artur (författare)
- RISE,IVF,Chalmers University of Technology, Sweden,Swerea IVF, Biobased Fibers, Argongatan 30, S-43153 Molndal, Sweden.;Chalmers Univ Technol, Forest Prod & Chem Engn, Gothenburg, Sweden.,Chalmers tekniska högskola
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- Köhnke, Tobias (författare)
- RISE,IVF,Swerea IVF, Biobased Fibers, Argongatan 30, S-43153 Molndal, Sweden.
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- Hagman, Joel (författare)
- Lund 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
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- Olsson, Ulf (författare)
- Lund 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
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- Theliander, Hans (författare)
- KTH Royal Institute of Technology,KTH,Wallenberg Wood Science Center,Chalmers Univ Technol, Forest Prod & Chem Engn, Gothenburg, Sweden.;Chalmers Univ Technol,,Chalmers University of Technology, Sweden; KTH Royal Institute of Technology, Sweden,Chalmers tekniska högskola
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(creator_code:org_t)
- 2018-12-15
- 2019
- Engelska.
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Ingår i: Cellulose. - : Springer Science and Business Media LLC. - 0969-0239 .- 1572-882X. ; 26:3, s. 1545-1563
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Abstract
Ämnesord
Stäng
- Abstract: Coagulation of cellulose solutions is a process whereby many useful materials with variable microstructures and properties can be produced. This study investigates the complexity of the phase separation that generates the structural heterogeneity of such materials. The ionic liquid, 1-ethyl-3-methylimidazolium acetate ([C2mim][OAc]), and a co-solvent, dimethylsulfoxide (DMSO), are used to dissolve microcrystalline cellulose in concentrations from 5 to 25 wt%. The solutions are coagulated in water or 2-propanol (2PrOH). The coagulated material is then washed and solvent exchanged (water → 2PrOH → butanone → cyclohexane) in order to preserve the generated microstructures upon subsequent drying before analysis. Sweep electron microscopy images of 50 k magnification reveal open-pore fibrillar structures. The crystalline constituents of those fibrils are estimated using wide-angle X-ray spectroscopy and specific surface area data. It is found that the crystalline order or crystallite size is reduced by an increase in cellulose concentration, by the use of the co-solvent DMSO, or by the use of 2PrOH instead of water as the coagulant. Because previous theories cannot explain these trends, an alternative explanation is presented here focused on solid–liquid versus liquid–liquid phase separations. Graphical abstract: [Figure not available: see fulltext.].
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- Cellulose
- Co-solvent
- Ionic liquid
- Microstructure
- Non-solvent
- Regeneration
- Coagulation
- Crystallite size
- Ionic liquids
- Ketones
- Phase separation
- Praseodymium compounds
- Solvents
- X ray spectroscopy
- 1-ethyl-3-methylimidazolium acetates
- Cosolvents
- Electron microscopy images
- Micro-crystalline cellulose
- Microstructures and properties
- Non-solvents
- Structural heterogeneity
- Cellulose
- Co-solvent
- Ionic liquid
- Microstructure
- Non-solvent
- Regeneration
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- art (ämneskategori)
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