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https://hdl.handle.net/10316/106586
Title: | Simple One Pot Preparation of Chemical Hydrogels from Cellulose Dissolved in Cold LiOH/Urea | Authors: | Yang, Jiayi Medronho, Bruno Lindman, Björn Olof Norgren, Magnus |
Keywords: | LiOH/urea; Michael addition; methylenebisacrylamide; cellulose hydrogel | Issue Date: | 7-Feb-2020 | Publisher: | MDPI | Project: | FORMAS, grant number 942-2015-251 PTDC/AGR-TEC/4814/2014 PTDC/ASP-SIL/30619/2017 UIDB/05183/2020 |
Serial title, monograph or event: | Polymers | Volume: | 12 | Issue: | 2 | Abstract: | 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. | URI: | https://hdl.handle.net/10316/106586 | ISSN: | 2073-4360 | DOI: | 10.3390/polym12020373 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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Simple-one-pot-preparation-of-chemical-hydrogels-from-cellulose-dissolved-in-cold-LiOHUreaPolymers.pdf | 3.09 MB | Adobe PDF | View/Open |
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