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Simple one pot preparation of chemical hydrogels from cellulose dissolved in cold LiOH/Urea

Yang, Jiayi ; Medronho, Bruno LU ; Lindman, Björn LU and Norgren, Magnus LU (2020) In Polymers 12(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... (More)

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.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cellulose hydrogel, LiOH/urea, Methylenebisacrylamide, Michael addition
in
Polymers
volume
12
issue
2
article number
373
publisher
MDPI AG
external identifiers
  • pmid:32046040
  • scopus:85081242855
ISSN
2073-4360
DOI
10.3390/polym12020373
language
English
LU publication?
yes
id
48b0d9cf-e0e1-4220-baa6-6fb82d90163b
date added to LUP
2020-04-07 15:22:12
date last changed
2024-01-31 18:20:03
@article{48b0d9cf-e0e1-4220-baa6-6fb82d90163b,
  abstract     = {{<p>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 H<sub>2</sub>O/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.</p>}},
  author       = {{Yang, Jiayi and Medronho, Bruno and Lindman, Björn and Norgren, Magnus}},
  issn         = {{2073-4360}},
  keywords     = {{Cellulose hydrogel; LiOH/urea; Methylenebisacrylamide; Michael addition}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{2}},
  publisher    = {{MDPI AG}},
  series       = {{Polymers}},
  title        = {{Simple one pot preparation of chemical hydrogels from cellulose dissolved in cold LiOH/Urea}},
  url          = {{http://dx.doi.org/10.3390/polym12020373}},
  doi          = {{10.3390/polym12020373}},
  volume       = {{12}},
  year         = {{2020}},
}