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Simple one pot preparation of chemical hydrogels from cellulose dissolved in cold LiOH/Urea
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)ORCID iD: 0000-0002-5178-367x
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. (FSCN)ORCID iD: 0000-0003-3407-7973
2020 (English)In: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, Vol. 12, no 2, article id 373Article in journal (Refereed) Published
Abstract [en]

In this work, non-derivatized cellulose pulp was dissolved in a cold alkali solution (LiOH/urea) and chemically cross-linked with methylenebisacrylamide (MBA) to form a robust hydrogel with superior water absorption properties. Different cellulose concentrations (i.e., 2, 3 and 4 wt%) and MBA/glucose molar ratios (i.e., 0.26, 0.53 and 1.05) were tested. The cellulose hydrogel cured at 60 °C for 30 min, with a MBA/glucose molar ratio of 1.05, exhibited the highest water swelling capacity absorbing ca. 220 g H2O/g dry hydrogel. Moreover, the data suggest that the cross-linking occurs via a basic Michael addition mechanism. This innovative procedure based on the direct dissolution of unmodified cellulose in LiOH/urea followed by MBA cross-linking provides a simple and fast approach to prepare chemically cross-linked non-derivatized high-molecular-weight cellulose hydrogels with superior water uptake capacity. 

Place, publisher, year, edition, pages
2020. Vol. 12, no 2, article id 373
Keywords [en]
Cellulose hydrogel, LiOH/urea, Methylenebisacrylamide, Michael addition
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:miun:diva-38703DOI: 10.3390/polym12020373Scopus ID: 2-s2.0-85081242855OAI: oai:DiVA.org:miun-38703DiVA, id: diva2:1416733
Available from: 2020-03-25 Created: 2020-03-25 Last updated: 2020-03-25

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