Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.apsusc.2016.10.112 http://hdl.handle.net/11449/173727 |
Resumo: | The 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 °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, X-ray 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 °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 °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 °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. |
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Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additionsMicrostructureNaOH oxidationPoly(furfuryl alcohol)Reticulated vitreous carbonSurface functionalitiesThe 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 °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, X-ray 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 °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 °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 °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.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)LAS Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas 1758Departamento de Materiais e Tecnologia Univ Estadual Paulista (UNESP), Av. Doutor Ariberto Pereira da Cunha 333, GuaratinguetáInstituto de Ciência e Tecnologia Universidade Federal de São Paulo (UNIFESP), Rua Talim 330Departamento de Materiais e Tecnologia Univ Estadual Paulista (UNESP), Av. Doutor Ariberto Pereira da Cunha 333, GuaratinguetáCNPq: #162683/2013-8FAPESP: #2014/27164-6CNPq: 303287/2013-6Instituto Nacional de Pesquisas Espaciais (INPE)Universidade Estadual Paulista (Unesp)Universidade Federal de São Paulo (UNIFESP)Oishi, Silvia SizukaBotelho, Edson Cocchieri [UNESP]Rezende, Mirabel CerqueiraFerreira, Neidenêi Gomes2018-12-11T17:07:28Z2018-12-11T17:07:28Z2017-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article87-97application/pdfhttp://dx.doi.org/10.1016/j.apsusc.2016.10.112Applied Surface Science, v. 394, p. 87-97.0169-4332http://hdl.handle.net/11449/17372710.1016/j.apsusc.2016.10.1122-s2.0-849943445382-s2.0-84994344538.pdf43780783373436600000-0001-8338-4879Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengApplied Surface Science1,093info:eu-repo/semantics/openAccess2023-12-18T06:12:35Zoai:repositorio.unesp.br:11449/173727Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-12-18T06:12:35Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions |
title |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions |
spellingShingle |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions Oishi, Silvia Sizuka Microstructure NaOH oxidation Poly(furfuryl alcohol) Reticulated vitreous carbon Surface functionalities |
title_short |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions |
title_full |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions |
title_fullStr |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions |
title_full_unstemmed |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions |
title_sort |
Structural and surface functionality changes in reticulated vitreous carbon produced from poly(furfuryl alcohol) with sodium hydroxide additions |
author |
Oishi, Silvia Sizuka |
author_facet |
Oishi, Silvia Sizuka Botelho, Edson Cocchieri [UNESP] Rezende, Mirabel Cerqueira Ferreira, Neidenêi Gomes |
author_role |
author |
author2 |
Botelho, Edson Cocchieri [UNESP] Rezende, Mirabel Cerqueira Ferreira, Neidenêi Gomes |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Instituto Nacional de Pesquisas Espaciais (INPE) Universidade Estadual Paulista (Unesp) Universidade Federal de São Paulo (UNIFESP) |
dc.contributor.author.fl_str_mv |
Oishi, Silvia Sizuka Botelho, Edson Cocchieri [UNESP] Rezende, Mirabel Cerqueira Ferreira, Neidenêi Gomes |
dc.subject.por.fl_str_mv |
Microstructure NaOH oxidation Poly(furfuryl alcohol) Reticulated vitreous carbon Surface functionalities |
topic |
Microstructure NaOH oxidation Poly(furfuryl alcohol) Reticulated vitreous carbon Surface functionalities |
description |
The 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 °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, X-ray 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 °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 °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 °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. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-02-01 2018-12-11T17:07:28Z 2018-12-11T17:07:28Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.apsusc.2016.10.112 Applied Surface Science, v. 394, p. 87-97. 0169-4332 http://hdl.handle.net/11449/173727 10.1016/j.apsusc.2016.10.112 2-s2.0-84994344538 2-s2.0-84994344538.pdf 4378078337343660 0000-0001-8338-4879 |
url |
http://dx.doi.org/10.1016/j.apsusc.2016.10.112 http://hdl.handle.net/11449/173727 |
identifier_str_mv |
Applied Surface Science, v. 394, p. 87-97. 0169-4332 10.1016/j.apsusc.2016.10.112 2-s2.0-84994344538 2-s2.0-84994344538.pdf 4378078337343660 0000-0001-8338-4879 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Applied Surface Science 1,093 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
87-97 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1792962108058501120 |