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dc.creatorCordero, Andrés Ignacio
dc.creatorAmalvy, Javier
dc.creatorFortunati, Elena
dc.creatorKenny, José María
dc.creatorChiacchiarelli, Leonel Matías
dc.date.accessioned2019-02-02T23:08:57Z
dc.date.available2019-02-02T23:08:57Z
dc.date.issued2015
dc.identifier.citationCarbohydrate Polymerses_ES
dc.identifier.urihttp://hdl.handle.net/123456789/3412
dc.description.abstractNanocrystalline cellulose (CNC), obtained by sulphuric acid hydrolysis, was used to synthesize polyurethane foams (PUFs) based on a functionalized castor oil polyol and a Methylene diphenyl diiso- cyanate (MDI). Formulations with varying isocyanate index (FI) and NCO number were prepared. At 0.5 wt.%, SEM’s of the fractured surface underlined that the CNC acted both as a nucleation agent and as a particulate surfactant with cell geometries and apparent density changing selectively. The chemical structure of the PUF (FTIR) changed after the incorporation of CNC by a relative change of the amount of urea, urethane and isocyanurate groups. A low NCO number and isocyanate index contributed to the migration of the CNC to the Hard Segment (HS), acting as reinforcement and improving substantially the compressive mechanical properties (Ec and �����c improvements of 63 and 50%, respectively). For a high NCO number or isocyanate index, the CNC migrated to the Soft Segment (SS), without causing a reinforcement effect. The migration of the CNC was also detected with DSC, TGA and DMA, furtherly supporting the hypothesis that a low NCO number and index contributed both to the formation of a microstructure with a higher content of urethane groups.es_ES
dc.formatapplication/pdfes_ES
dc.language.isoenges_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.rights.uriAttribution-NonCommercial-NoDerivatives 4.0 Internacional*
dc.subjectPolyurethane foams, Castor oil polyol, Nanocrystalline cellulose, Mechanical properties, Thermal propertieses_ES
dc.titleThe role of nanocrystalline cellulose on the microstructure of foamed castor-oil polyurethane nanocompositeses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.rights.holderElsevier Ltd.es_ES
dc.description.affiliationCordero, Andrés Ignacio. INIFTA (Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas). CONICET; Argentinaes_ES
dc.description.affiliationAmalvy, Javier. UNLP (Universidad Nacional de La Plata). INIFTA (Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas). CONICET. CIDEPINT (Centro de Investigación y Desarrollo en Tecnología de Pinturas) CONICET/CICPBA. UTN (Universidad Tecnológica Nacional). CITEMA (Centro de Investigación y Desarrollo en Ciencia y Tecnología de Materiales); Argentinaes_ES
dc.description.affiliationFortunati, Elena. University of Perugia. Materials Engineering Center. UdR INSTM; Italyes_ES
dc.description.affiliationKenny, José María. University of Perugia. Materials Engineering Center. UdR INSTM; Italyes_ES
dc.description.affiliationChiacchiarelli, Leonel Matías. ITPN (Instituto de Tecnología de Polímeros y Nanotecnología). CONICET-UBA; Argentinaes_ES
dc.description.peerreviewedPeer Reviewedes_ES
dc.type.versioninfo:eu-repo/semantics/publisherVersiones_ES
dc.type.snrdinfo:ar-repo/semantics/artículoes_ES
dc.rights.useAtribución (Attribution): En cualquier explotación de la obra autorizada por la licencia será necesario reconocer la autoría (obligatoria en todos los casos). No comercial (Non Commercial): La explotación de la obra queda limitada a usos no comerciales. Sin obras derivadas (No Derivate Works): La autorización para explotar la obra no incluye la posibilidad de crear una obra derivada (traducciones, adaptaciones, etc.).es_ES
dc.identifier.doi10.1016/j.carbpol.2015.07.077


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