Influence of the coagulation bath on the nanostructure of cellulose films regenerated from an ionic liquid solution

被引:2
|
作者
Tiihonen, Lassi V. [1 ]
Bernardo, Gabriel [2 ,3 ]
Dalgliesh, Robert [4 ]
Mendes, Adelio [2 ,3 ]
Parnell, Steven R. [1 ,4 ]
机构
[1] Delft Univ Technol, Fac Appl Sci, NL-2629 JB Delft, Netherlands
[2] Univ Porto, Fac Engn, LEPABE Lab Proc Engn Environm Biotechnol & Energy, Rua Dr Roberto Frias, P-4200465 Porto, Portugal
[3] Univ Porto, Fac Engn, ALiCE Associate Lab Chem Engn, Rua Dr Roberto Frias, P-4200465 Porto, Portugal
[4] Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Chilton OX11 0QX, Oxon, England
关键词
METHYLMORPHOLINE-N-OXIDE; MEMBRANES; WATER; MORPHOLOGY; SCATTERING; KINETICS; NMMO;
D O I
10.1039/d4ra00971a
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Cellulose membranes were prepared from an EMIMAc ionic liquid solution by nonsolvent-induced phase separation (NIPS) in coagulation baths of water-acetone mixtures, ethanol-water mixtures and water at different temperatures. High water volume fractions in the coagulation bath result in a highly reproducible gel-like structure with inhomogeneities observed by small-angle neutron scattering (SANS). A structural transition of cellulose takes place in water-acetone baths at very low water volume fractions, while a higher water bath temperature increases the size of inhomogeneities in the gel-like structure. These findings demonstrate the value of SANS for characterising and understanding the structure of regenerated cellulose films in their wet state. Such insights can improve the engineering and structural tuning of cellulose membranes, either for direct use or as precursors for carbon molecular sieve membranes. The structure of cellulose films prepared by nonsolvent-induced phase separation in coagulation baths of different mixtures and temperatures. High water volume fractions in the coagulation bath result in a highly reproducible gel-like structure with inhomogeneities.
引用
收藏
页码:12888 / 12896
页数:9
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