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Modulating the microstructure of waterborne polyurethanes for preparation of environmentally friendly nanocomposites by incorporating cellulose nanocrystals

2017Journal article Restricted access
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dc.contributor.authorSantamaria-Echart, Arantzazu
dc.contributor.authorUgarte, Lorena
dc.contributor.authorArbelaiz, Aitor
dc.contributor.authorBarreiro, M.F.
dc.contributor.authorCorcuera, Maria Angeles
dc.contributor.authorEceiza, Arantaxa
dc.date.accessioned2017-03-06T12:23:55Z
dc.date.available2017-03-06T12:23:55Z
dc.date.issued2017
dc.description.abstractIncreasing environmental awareness has promoted development of ecofriendly materials incorporating renewable raw materials and using green synthesis routes such as waterborne dispersion, avoiding employment of organic solvents and thus reducing generation of volatile organic compounds. In this regard, waterborne polyurethanes (WBPU) present an opportunity to tailor material properties while meeting application requirements and avoiding use of organic solvents. In addition, WBPU dispersions offer the possibility to incorporate hydrophilicwater-dispersible reinforcement materials, such as cellulose nanocrystals (CNC), which represent a suitable candidate for preparation of nanocomposites due to their renewability, availability, and unique properties resulting from their nanoscale dimension. Therefore, in this work, different WBPU having small particle size with narrow distribution were synthesized at various isocyanate/hydroxyl (NCO/OH) group ratios, and CNC were isolated for preparation of nanocomposites with 1, 3, or 5 wt% CNC by solvent casting. It was observed that, just by varying the NCO/OH ratio, the polyurethane microstructure was altered, resulting in different ordered structures. At low NCO/OH ratio, soft ordered domains were observed, whereas at higher NCO/OH ratio, hard ordered domains were obtained. These different microstructures of the matrix induced different behaviors of the CNC reinforcement, acting either as crystal growth inhibitor or nucleating agent, thereby modulating the properties of the final material in different ways.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSantamaria-Echart, A.; Ugarte, L.; Arbelaiz, A.; Barreiro, M.F.; Corcuera, M.A.; Eceiza, A. (2017). Modulating the microstructure of waterborne polyurethanes for preparation of environmentally friendly nanocomposites by incorporating cellulose nanocrystals. Cellulose. 2:24, p. 823-834pt_PT
dc.identifier.doi10.1007/s10570-016-1158-9pt_PT
dc.identifier.urihttp://hdl.handle.net/10198/14090
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectCellulose nanocrystalspt_PT
dc.subjectWaterbornept_PT
dc.subjectNanocompositespt_PT
dc.subjectMechanical propertiespt_PT
dc.subjectPolyurethanept_PT
dc.subjectThermal propertiespt_PT
dc.subjectAtomic force microscopypt_PT
dc.titleModulating the microstructure of waterborne polyurethanes for preparation of environmentally friendly nanocomposites by incorporating cellulose nanocrystalspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage834pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage823pt_PT
oaire.citation.titleCellulosept_PT
oaire.citation.volume24pt_PT
person.familyNameSantamaria-Echart
person.familyNameBarreiro
person.givenNameArantzazu
person.givenNameFilomena
person.identifier.ciencia-id0C17-1E1F-2621
person.identifier.ciencia-id3418-47D5-5746
person.identifier.orcid0000-0003-0107-7301
person.identifier.orcid0000-0002-6844-333X
person.identifier.ridL-9802-2014
person.identifier.scopus-author-id56725697700
person.identifier.scopus-author-id57188719717
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationeb945e05-928f-45cb-ac27-04b4159ae31a
relation.isAuthorOfPublication0391987c-ba90-488b-839a-153447ce1f0f
relation.isAuthorOfPublication.latestForDiscovery0391987c-ba90-488b-839a-153447ce1f0f

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