Publication
Simple one pot preparation of chemical hydrogels from cellulose dissolved in cold LiOH/urea
| dc.contributor.author | Yang, Jiayi | |
| dc.contributor.author | Medronho, Bruno | |
| dc.contributor.author | Lindman, Björn | |
| dc.contributor.author | Norgren, Magnus | |
| dc.date.accessioned | 2020-04-06T09:59:35Z | |
| dc.date.available | 2020-04-06T09:59:35Z | |
| dc.date.issued | 2020-02 | |
| dc.description.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. | pt_PT |
| dc.description.sponsorship | Portuguese Foundation for Science and Technology, FCT, via the projects PTDC/AGR-TEC/4814/2014, PTDC/ASP-SIL/30619/2017 and UIDB/05183/2020, and the research grant IF/01005/2014. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.doi | 10.3390/polym12020373 | pt_PT |
| dc.identifier.issn | 2073-4360 | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/13692 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.publisher | MDPI | pt_PT |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt_PT |
| dc.subject | LiOH/urea | pt_PT |
| dc.subject | Michael addition | pt_PT |
| dc.subject | Methylenebisacrylamide | pt_PT |
| dc.subject | Cellulose hydrogel | pt_PT |
| dc.title | Simple one pot preparation of chemical hydrogels from cellulose dissolved in cold LiOH/urea | pt_PT |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.issue | 2 | pt_PT |
| oaire.citation.startPage | 373 | pt_PT |
| oaire.citation.title | Polymers | pt_PT |
| oaire.citation.volume | 12 | pt_PT |
| person.familyName | Medronho | |
| person.givenName | Bruno | |
| person.identifier.ciencia-id | 6918-9AB3-8D22 | |
| person.identifier.orcid | 0000-0003-0972-1739 | |
| person.identifier.rid | P-5927-2014 | |
| person.identifier.scopus-author-id | 9940656700 | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | article | pt_PT |
| relation.isAuthorOfPublication | 4c03571a-93da-4504-8acf-c74326449852 | |
| relation.isAuthorOfPublication.latestForDiscovery | 4c03571a-93da-4504-8acf-c74326449852 |