Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions

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dc.citation.volume394
dc.contributor.authorOishi, Silvia Sizuka
dc.contributor.authorBotelho, Edson Cocchieri
dc.contributor.authorRezende, Mirabel Cerqueira [UNIFESP]
dc.contributor.authorFerreira, Neidenei Gomes
dc.coverageAmsterdam
dc.date.accessioned2020-07-17T14:03:12Z
dc.date.available2020-07-17T14:03:12Z
dc.date.issued2017
dc.description.abstractThe use of sodium hydroxide to neutralize the acid catalyst increases the storage life of poly(furfuryl alcohol) (PFA) resin avoiding its continuous polymerization. In this work, a concentrated sodium hydroxide solution (NaOH) was added directly to the PFA resin in order to minimize the production of wastes generated when PFA is washed with diluted basic solution. Thus, different amounts of this concentrated basic solution were added to the resin up to reaching pH values of around 3, 5, 7, and 9. From these four types of modified PFA two sample sets of reticulated vitreous carbon (RVC) were processed and heat treated at two different temperatures (1000 and 1700 degrees C). A correlation among cross-link density of PFA and RVC morphology, structural ordering and surface functionalities was systematically studied using Fourier transform infrared spectroscopy, scanning electron microscopy, Raman spectroscopy, Xray diffraction, and X-ray photoelectron spectroscopy techniques. The PFA neutralization (pH 7) led to its higher polymerization degree, promoting a crystallinity decrease on RVC treated at 1000 degrees C as well as its highest percentages of carboxylic groups on surface. A NaOH excess (pH 9) substantially increased the RVC oxygen content, but its crystallinity remained similar to those for samples from pH 3 and 5 treated at 1000 degrees C, probably due to the reduced presence of carboxylic group and the lower polymerization degree of its cured resin. Samples with pH 3 and 5 heat treated at 1000 and 1700. degrees C can be considered the most ordered which indicated that small quantities of NaOH may be advantageous to minimize continuous polymerization of PFA resin increasing its storage life and improving RVC microstructure. (C) 2016 Elsevier B.V. All rights reserved.en
dc.description.affiliationINPE, LAS, Ave Astronautas 1758, BR-12227010 Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationUniv Estadual Paulista UNESP, Dept Mat & Tecnol, Ave Doutor Ariberto Pereira da Cunha 333, BR-12516410 Guaratingueta, SP, Brazil
dc.description.affiliationUniv Fed Sao Paulo UNIFESP, Inst Ciencia & Tecnol, Rua Talim 330, BR-12231280 Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationUnifespUniv Fed Sao Paulo UNIFESP, Inst Ciencia & Tecnol, Rua Talim 330, BR-12231280 Sao Jose Dos Campos, SP, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipCNPq
dc.description.sponsorshipSao Paulo Research Foundation (FAPESP)
dc.description.sponsorshipCAPES/PVNS
dc.description.sponsorshipIDCNPq: 162683/2013-8
dc.description.sponsorshipIDCNPq: 303287/2013-6
dc.description.sponsorshipIDFAPESP: 2014/27164-6
dc.format.extent87-97
dc.identifierhttp://dx.doi.org/10.1016/j.apsusc.2016.10.112
dc.identifier.citationApplied Surface Science. Amsterdam, v. 394, p. 87-97, 2017.
dc.identifier.doi10.1016/j.apsusc.2016.10.112
dc.identifier.issn0169-4332
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/55226
dc.identifier.wosWOS:000389152900011
dc.language.isoeng
dc.publisherElsevier Science Bv
dc.relation.ispartofApplied Surface Science
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectPoly(furfuryl alcohol)en
dc.subjectReticulated vitreous carbonen
dc.subjectSurface functionalitiesen
dc.subjectMicrostructureen
dc.subjectNaOH oxidationen
dc.titleStructural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additionsen
dc.typeinfo:eu-repo/semantics/article
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