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110th Anniversary: High-Molecular-Weight Chitin and Cellulose Hydrogels from Biomass in Ionic Liquids without Chemical Crosslinking
journal contribution
posted on 2019-10-18, 17:49 authored by Paula Berton, Xiaoping Shen, Robin D. Rogers, Julia L. ShamshinaCellulose, chitin, and composite
3D hydrogels and membranes were
fabricated without any chemical modification from high-molecular-weight
chitin and cellulose-rich material (CRM) extracted from shrimp shell
or poplar wood, respectively, using the ionic liquid (IL) 1-ethyl-3-methylimidazolium
acetate ([C2mim][OAc]). The hydrogels were prepared by
redissolution of the extracted biopolymers in the same IL, or in a
one-pot process directly from a solution of the biomass after extraction,
followed by molding/gelation (“3D gels”) or casting
(membranes), and then washing. For comparison, the preparation of
gels was attempted using commercial microcrystalline cellulose or
chitin. From all of the sources, the regenerated CRM or chitin required
significantly lower load. Hydrogels were also converted to aerogels
via transformation to alcogels and then Sc-CO2 drying,
giving materials of low density, high porosity, favorable compressibility,
high water uptake, and moderate antioxidant activity. Air-dried membranes
were dense, of high tensile strength, and exhibited high water-vapor
transmission.
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Keywords
regenerated CRMwater-vapor transmissionone-pot processchemical modificationIonic Liquidsantioxidant activityshrimp shellwater uptakeAir-dried membranesSc-CO 2Cellulose Hydrogelsmicrocrystalline cellulosepoplar woodhigh-molecular-weight chitinChemical Crosslinking CelluloseHigh-Molecular-Weight Chitin3 D hydrogelsILcellulose-rich material
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