SiOC ceramic foams synthesized from electron beam irradiated methylsilicone resin

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dc.contributor.authorROCHA, R.M.pt_BR
dc.contributor.authorMOURA, E.A.B.pt_BR
dc.contributor.authorBRESSIANI, A.H.A.pt_BR
dc.contributor.authorBRESSIANI, J.C.pt_BR
dc.coverageInternacionalpt_BR
dc.date.accessioned2014-07-15T13:43:57Zpt_BR
dc.date.accessioned2014-07-30T11:49:01Z
dc.date.available2014-07-15T13:43:57Zpt_BR
dc.date.available2014-07-30T11:49:01Z
dc.date.issued2008pt_BR
dc.description.abstractA new method to prepare silicon oxycarbide (SiOC) foams has been developed and it consists of electron beam irradiation of a methylsilicone preceramic polymer followed by pyrolysis in an inert atmosphere. Methylsilicone resin foams were prepared by simultaneous curing and foaming, without the addition of calalysts or blowing agents. The polymer precursor was irradiated with 1.5 MeV EB up to a dose of 7.0 MGy and at a dose rate of 2.8 kG/s, in air. During irradiation the polymer melted, due to rapid increase in temperature, and simultaneously crosslinked by interaction with the ionizing radiation. Crosslinking occurred mainly by poly-condensation reactions and gaseous condensation products were released. The latter acted as an intrinsic foaming agent in the molten polymer. Foams obtained with radiation doses higher than 3.5 MGy showed a high degree of crosslinking with a ceramic yield of over 89% at 1,000 °C. Pyrolysis at 1,200-1,500 °C resulted in SiOC ceramic foams with dense struts and walls, with bulk density around 0.3 g/cm3 and total porosity of 84%. Foams pyrolyzed at 1,200 °C revealed compression strength of 6.8 MPa.
dc.format.extent4466-4474pt_BR
dc.identifier.citationROCHA, R.M.; MOURA, E.A.B.; BRESSIANI, A.H.A.; BRESSIANI, J.C. SiOC ceramic foams synthesized from electron beam irradiated methylsilicone resin. <b>Journal of Materials Science</b>, v. 43, p. 4466-4474, 2008. DOI: <a href="https://dx.doi.org/10.1007/s10853-008-2654-6">10.1007/s10853-008-2654-6</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/5080.
dc.identifier.doi10.1007/s10853-008-2654-6
dc.identifier.issn0022-2461pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-3546-1643
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/5080pt_BR
dc.identifier.vol43pt_BR
dc.relation.ispartofJournal of Materials Sciencept_BR
dc.rightsopenAccessen
dc.subjectsilicon oxidespt_BR
dc.subjectceramicspt_BR
dc.subjectporous materialspt_BR
dc.subjectfoamspt_BR
dc.subjectsynthesispt_BR
dc.subjectelectron beamspt_BR
dc.subjectirradiationpt_BR
dc.subjectsiliconpt_BR
dc.subjectresinspt_BR
dc.subjectcross-linkingpt_BR
dc.titleSiOC ceramic foams synthesized from electron beam irradiated methylsilicone resinpt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorJOSE CARLOS BRESSIANI
ipen.autorANA HELENA DE ALMEIDA BRESSIANI
ipen.autorESPERIDIANA AUGUSTA BARRETOS DE MOURA
ipen.codigoautor1459
ipen.codigoautor96
ipen.codigoautor1045
ipen.contributor.ipenauthorJOSE CARLOS BRESSIANI
ipen.contributor.ipenauthorANA HELENA DE ALMEIDA BRESSIANI
ipen.contributor.ipenauthorESPERIDIANA AUGUSTA BARRETOS DE MOURA
ipen.date.recebimento09-01pt_BR
ipen.identifier.fi1.181pt_BR
ipen.identifier.ipendoc13069pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.range.fi0.001 - 1.499
ipen.type.genreArtigo
relation.isAuthorOfPublicationf9cbec71-8864-4175-998d-637777f90c2d
relation.isAuthorOfPublication04d834e7-faee-4461-8fa7-5e5071ec48cc
relation.isAuthorOfPublication6bf804a8-aeed-4e9c-bad7-fdec1b1e9a47
relation.isAuthorOfPublication.latestForDiscovery6bf804a8-aeed-4e9c-bad7-fdec1b1e9a47
sigepi.autor.atividadeMOURA, E.A.B.:1045:220:Npt_BR
sigepi.autor.atividadeBRESSIANI, A.H.A.:96:720:Npt_BR
sigepi.autor.atividadeBRESSIANI, J.C.:1459:720:Npt_BR
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