Simple one pot preparation of chemical hydrogels from cellulose dissolved in cold LiOH/Urea
(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.
(Less)
- author
- Yang, Jiayi ; Medronho, Bruno LU ; Lindman, Björn LU and Norgren, Magnus LU
- organization
- publishing date
- 2020-02-07
- 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
-
- scopus:85081242855
- pmid:32046040
- 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
- 2024-07-24 16:16:54
@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}},
}