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Investigation of the Structure of Cellulose in LiCl/DMAc Solution and Its Gelation Behavior by Small‐Angle X‐Ray Scattering Measurements
Author(s) -
Ishii Daisuke,
Tatsumi Daisuke,
Matsumoto Takayoshi,
Murata Kazuki,
Hayashi Hisao,
Yoshitani Hiroshi
Publication year - 2006
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200500231
Subject(s) - small angle x ray scattering , cellulose , scattering , x ray , small angle scattering , chemistry , chemical engineering , materials science , crystallography , optics , organic chemistry , physics , engineering
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.