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Rheo-NMR study of water-based cellulose liquid crystal system at high shear rates

2015-05-18Journal article Restricted access
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dc.contributor.authorEcheverria, Coro
dc.contributor.authorAlmeida, Pedro L.
dc.contributor.authorFeio, Gabriel
dc.contributor.authorFigueirinhas, João
dc.contributor.authorRey, Alejandro D.
dc.contributor.authorGodinho, Maria Helena
dc.date.accessioned2016-03-18T15:11:56Z
dc.date.available2016-03-18T15:11:56Z
dc.date.issued2015-05-18
dc.description.abstractSince long ago cellulosic lyotropic liquid crystals were thought as potential materials to produce fibers competitive with spidersilk or Kevlar, yet the processing of high modulus materials from cellulose-based precursors was hampered by their complex rheological behavior. In this work, by using the Rheo-NMR technique, which combines deuterium NMR with rheology, we investigate the high shear rate regimes that may be of interest to the industrial processing of these materials. Whereas the low shear rate regimes were already investigated by this technique in different works [1-4], the high shear rates range is still lacking a detailed study. This work focuses on the orientational order in the system both under shear and subsequent relaxation process arising after shear cessation through the analysis of deuterium spectra from the deuterated solvent water. At the analyzed shear rates the cholesteric order is suppressed and a flow-aligned nematic is observed which for the higher shear rates develops after certain time periodic perturbations that transiently annihilate the order in the system. During relaxation the flow aligned nematic starts losing order due to the onset of the cholesteric helices leading to a period of very low order where cholesteric helices with different orientations are forming from the aligned nematic, followed in the final stage by an increase in order at long relaxation times corresponding to the development of aligned cholesteric domains. This study sheds light on the complex rheological behavior of chiral nematic cellulose-based systems and opens ways to improve its processing. (C) 2015 Elsevier Ltd. All rights reserved.pt_PT
dc.identifier.citationECHEVERRIA, Coro; [et al.] - Rheo-NMR study of water-based cellulose liquid crystal system at high shear rates. Polymer. ISSN. 0032-3861. Vol. 65 (2015), pp. 18-25pt_PT
dc.identifier.doi10.1016/j.polymer.2015.03.050pt_PT
dc.identifier.issn0032-3861
dc.identifier.issn1873-2291
dc.identifier.urihttp://hdl.handle.net/10400.21/5916
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevier SCI LTDpt_PT
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0032386115002876pt_PT
dc.subjectCellulosept_PT
dc.subjectLiquid crystalpt_PT
dc.subjectRheo-NMRpt_PT
dc.titleRheo-NMR study of water-based cellulose liquid crystal system at high shear ratespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage25pt_PT
oaire.citation.startPage18pt_PT
oaire.citation.volume65pt_PT
person.familyNameMarques de Almeida
person.familyNameFeio
person.familyNameFigueirinhas
person.familyNameGodinho
person.givenNamePedro
person.givenNameGabriel
person.givenNameJoão
person.givenNameMaria Helena
person.identifier2206212
person.identifier.ciencia-id0218-71B2-2DE0
person.identifier.ciencia-idCB1B-52B5-D425
person.identifier.ciencia-idC316-7B1F-4513
person.identifier.orcid0000-0001-7356-8455
person.identifier.orcid0000-0003-1257-5824
person.identifier.orcid0000-0001-9254-1864
person.identifier.orcid0000-0002-9760-5983
person.identifier.ridB-4356-2009
person.identifier.ridJ-3695-2013
person.identifier.ridA-4278-2013
person.identifier.ridJ-3679-2013
person.identifier.scopus-author-id57190384213
person.identifier.scopus-author-id24484581400
person.identifier.scopus-author-id55909453200
person.identifier.scopus-author-id7005654016
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication429b6d71-328e-42b3-8151-15493de249b8
relation.isAuthorOfPublicationa15cb9fe-ebbc-4450-a85c-77e4680b1967
relation.isAuthorOfPublication8287ac27-3195-4e9d-956f-63e80198f99e
relation.isAuthorOfPublication9e92c2e7-f179-42a4-b284-2b30b769aa0b
relation.isAuthorOfPublication.latestForDiscovery8287ac27-3195-4e9d-956f-63e80198f99e

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