Influence of cellulose nanofibrils on soft and hard segments of polyurethane/cellulose nanocomposites and effect of humidity on their mechanical properties

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Influence of cellulose nanofibrils on soft and hard segments of polyurethane/cellulose nanocomposites and effect of humidity on their mechanical properties

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dc.contributor Universidade Estadual Paulista (UNESP)
dc.creator Sanches, Alex Otavio
dc.creator Siliano Ricco, Luciano Henrique
dc.creator Malmonge, Luiz Francisco
dc.creator Silva, Michael Jones da
dc.creator Sakamoto, Walter Katsumi
dc.creator Malmonge, Jose Antonio
dc.date 2015-03-18T15:53:59Z
dc.date 2015-03-18T15:53:59Z
dc.date 2014-12-01
dc.date.accessioned 2016-04-20T18:18:52Z
dc.date.available 2016-04-20T18:18:52Z
dc.date.issued 2016-04-20
dc.identifier http://dx.doi.org/10.1016/j.polymertesting.2014.08.013
dc.identifier Polymer Testing. Oxford: Elsevier Sci Ltd, v. 40, p. 99-105, 2014.
dc.identifier 0142-9418
dc.identifier http://hdl.handle.net/11449/116716
dc.identifier 10.1016/j.polymertesting.2014.08.013
dc.identifier WOS:000345541800014
dc.identifier.uri http://www.repotur.gov.ar/handle/123456789/5718
dc.description Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description Processo FAPESP: 12/23637-1
dc.description Cellulose nanofibrils (CNFs) were prepared by sulfuric acid hydrolysis from cotton microfibers, and used to prepare polyurethane (PU) nanocomposites by mixing CNFs and PU water suspensions. CNFs as nanofillers improved the tensile strength of PU significantly up to 10 wt% content. With an increase in the CNF content, the glass transition temperature of PU and the temperature onset of the soft segment increased compared with those of neat PU. However, the crystalline phase present in soft domains and its melting temperature decreased. The influences of humidity on the mechanical properties of PU/CNF nanacomposites were also investigated. The tensile strength at different elongations of PU/CNF nanocomposites decreased substantially after being exposed to 60% relative humidity for 24 h; for 10 wt% loading, the tensile strength at 500% dropped from 10.64 to 2.34 MPa. This behavior was attributed to the formation of hydrogen bonds of PU and CNFs with water. (C) 2014 Elsevier Ltd. All rights reserved.
dc.format 99-105
dc.language eng
dc.publisher Elsevier B.V.
dc.relation Polymer Testing
dc.rights closedAccess
dc.subject Particle-reinforcement
dc.subject Cellulose nanofibrils
dc.subject Nanocomposite
dc.subject Polyurethane
dc.title Influence of cellulose nanofibrils on soft and hard segments of polyurethane/cellulose nanocomposites and effect of humidity on their mechanical properties
dc.type info:eu-repo/semantics/article


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