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Open AccessArticle

Preparation of Reswellable Amorphous Porous Celluloses through Hydrogelation from Ionic Liquid Solutions

Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 860-0065, Japan
Author to whom correspondence should be addressed.
Materials 2019, 12(19), 3249;
Received: 5 September 2019 / Revised: 30 September 2019 / Accepted: 3 October 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Biobased Polymers)
In this study, we have performed the preparation of reswellable amorphous porous celluloses through regeneration from hydrogels. The cellulose hydrogels were first prepared from solutions with an ionic liquid, 1-butyl-3-methylimidazolium chloride (BMIMCl), in different concentrations. Lyophilization of the hydrogels efficiently produced the regenerated celluloses. The powder X-ray diffraction and scanning electron microscopic measurements of the products suggest an amorphous structure and porous morphology, respectively. Furthermore, the pore sizes of the regenerated celluloses, or in turn, the network sizes of cellulose chains in the hydrogels, were dependent on the concentrations of the initially prepared solutions with BMIMCl, which also affected the tensile mechanical properties. It was suggested that the dissolution states of the cellulose chains in the solutions were different, in accordance with the concentrations, which representatively dominated the pore and network sizes of the above materials. When the porous celluloses were immersed in water, reswelling was observed to regenerate the hydrogels. View Full-Text
Keywords: amorphous; hydrogel; ionic liquid; regenerated cellulose; reswelling amorphous; hydrogel; ionic liquid; regenerated cellulose; reswelling
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Idenoue, S.; Oga, Y.; Hashimoto, D.; Yamamoto, K.; Kadokawa, J.-I. Preparation of Reswellable Amorphous Porous Celluloses through Hydrogelation from Ionic Liquid Solutions. Materials 2019, 12, 3249.

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