Publication
On cellulose dissolution and aggregation in aqueous tetrabutylammonium hydroxide
| dc.contributor.author | Gubitosi, Marta | |
| dc.contributor.author | Duarte, Hugo | |
| dc.contributor.author | Gentile, Luigi | |
| dc.contributor.author | Olsson, Ulf | |
| dc.contributor.author | Medronho, Bruno | |
| dc.date.accessioned | 2017-04-07T15:56:06Z | |
| dc.date.available | 2017-04-07T15:56:06Z | |
| dc.date.issued | 2016-09 | |
| dc.description.abstract | Aqueous tetrabutylammonium hydroxide, TBAH(aq), has been found to dissolve cellulose and to be a potential solvent for chemical processing or fiber spinning. In this paper, we have investigated the dissolution state of cellulose in 40 wt % TBAH(aq) solvent, and present an extensive study of rheology, combined with static light and small-angle X-ray scattering, to correlate cellulose aggregation with changes in the rheological parameters. Two cellulose molecular weights are compared. Microcrystalline cellulose (MCC), with a degree of polymerization of ca. 260, and a dissolving pulp with an approximately ten times higher molecular weight. Scattering data demonstrate that cellulose is molecularly dissolved at lower cellulose concentrations, while aggregates are present when the concentration exceeds a certain value. The onset of the aggregate formation is marked by a pronounced increase in the scattering intensity at low q, shear thinning behavior and violation of the empirical Cox-Merz rule. Additionally, the SAXS data suggest the presence of a solvation shell enriched in TBA+ ions, compared to the bulk solvent. The results are consistent with the recent suggestion that while native cellulose I may still dissolve, solutions are, above a particular concentration, becoming supersaturated with respect to the more stable crystal form cellulose II. | |
| dc.identifier.doi | 10.1021/acs.biomac.6b00696 | |
| dc.identifier.issn | 1525-7797 | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/9314 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | |
| dc.relation.isbasedon | WOS:000383213200011 | |
| dc.title | On cellulose dissolution and aggregation in aqueous tetrabutylammonium hydroxide | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 2881 | |
| oaire.citation.issue | 9 | |
| oaire.citation.startPage | 2873 | |
| oaire.citation.title | Biomacromolecules | |
| oaire.citation.volume | 17 | |
| 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 | restrictedAccess | |
| rcaap.type | article | |
| relation.isAuthorOfPublication | 4c03571a-93da-4504-8acf-c74326449852 | |
| relation.isAuthorOfPublication.latestForDiscovery | 4c03571a-93da-4504-8acf-c74326449852 |
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