Investigation of the Structure of Cellulose in LiCl/DMAc Solution and Its Gelation Behavior by Small-Angle X-Ray Scattering Measurements

Cellulose gels were prepared from cellulose in lithium chloride/N,N‐dimethylacetamide (LiCl/DMAc) solution. When the cellulose concentration in the solution is above the one at which cellulose molecules overlap, cellulose gels were formed. While the gel prepared by the addition of water was turbid,...

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Bibliographic Details
Published in:Macromolecular bioscience 2006-04, Vol.6 (4), p.293-300
Main Authors: Ishii, Daisuke, Tatsumi, Daisuke, Matsumoto, Takayoshi, Murata, Kazuki, Hayashi, Hisao, Yoshitani, Hiroshi
Format: Article
Language:English
Subjects:
Acetamides - chemistry
Applied sciences
cellulose
Cellulose - chemistry
Cellulose and derivatives
Exact sciences and technology
Gels
LiCl/DMAc
Lithium Chloride - chemistry
molecular properties
Natural polymers
Physicochemistry of polymers
Scattering, Radiation
small-angle X-ray scattering (SAXS)
Solutions
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Summary:Cellulose gels were prepared from cellulose in lithium chloride/N,N‐dimethylacetamide (LiCl/DMAc) solution. When the cellulose concentration in the solution is above the one at which cellulose molecules overlap, cellulose gels were formed. While the gel prepared by the addition of water was turbid, the one prepared by the ion exchange was colorless, transparent, and optically anisotropic. In order to explain this gelation behavior of cellulose, small‐angle X‐ray scattering (SAXS) measurements of the cellulose solutions and the gels were performed. The SAXS profiles of the cellulose solutions and the gels suggested that the large‐scale fluctuation of the molecular chain density in the solution can be the origin of the molecular aggregates formed in the gel. Furthermore, the differences in the structure of the gels at the macroscopic and the molecular level were discussed in terms of the phase separation and the molecular association. Polarized optical photograph of the cellulose gels.
ISSN:1616-5187
1616-5195
DOI:10.1002/mabi.200500231