Effect of electron beam radiation dose on the foam formation in pre-ceramic polymer

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dc.contributor.authorROCHA, ROSA M. dapt_BR
dc.contributor.authorMOURA, ESPERIDIANA A.B.pt_BR
dc.contributor.authorBRESSIANI, JOSE C.pt_BR
dc.contributor.authorBRESSIANI, ANA H.A.pt_BR
dc.coverageInternacionalpt_BR
dc.date.accessioned2014-07-15T13:40:21Zpt_BR
dc.date.accessioned2014-07-30T11:49:36Z
dc.date.available2014-07-15T13:40:21Zpt_BR
dc.date.available2014-07-30T11:49:36Z
dc.date.issued2010pt_BR
dc.description.abstractMethylsilicone resin as a polymer precursor for a SiOC ceramic material was cured and foamed by electron beam (EB) irradiation in air prior to the pyrolysis under an inert atmosphere. Methylsilicone foams were obtained without additional foaming agent when exposed to accelerated electrons with radiation doses up to 9MGy and dose rate of 2.8kGy/s. During irradiation the polymer was melted and simultaneously gaseous products were formed by the methyl group oxidation and by the polycondensation crosslinking reactions. The formed gases could not escape from the molten polymer and began to aggregate into bubbles. The effect of the radiation dose on the polymer foam molecular structure, the gel fraction and the ceramic yield was analyzed. The results indicate that the maximum amount of crosslinking in methylsilicone, when EB radiation is used, occurred between 1.0 and 2.0MGy radiation dose. Methylsilicone foams were pyrolysed in N2 atmosphere at temperatures of 1200 and 1500 1C, resulting in amorphous SiOC and partially crystalline ceramic foams, respectively. A porosity of 84% was achieved in the pyrolyzed foams, with cell size ranging from 30 to 300mm and density of about 0.31gcm3.
dc.format.extent301-305pt_BR
dc.identifier.citationROCHA, ROSA M. da; MOURA, ESPERIDIANA A.B.; BRESSIANI, JOSE C.; BRESSIANI, ANA H.A. Effect of electron beam radiation dose on the foam formation in pre-ceramic polymer. <b>Radiation Physics and Chemistry</b>, v. 79, n. 3, p. 301-305, 2010. DOI: <a href="https://dx.doi.org/10.1016/j.radphyschem.2009.08.020">10.1016/j.radphyschem.2009.08.020</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/4730.
dc.identifier.doi10.1016/j.radphyschem.2009.08.020
dc.identifier.fasciculo3pt_BR
dc.identifier.issn0969-806Xpt_BR
dc.identifier.orcidhttps://orcid.org/0000-0003-3546-1643
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/4730pt_BR
dc.identifier.vol79pt_BR
dc.relation.ispartofRadiation Physics and Chemistrypt_BR
dc.rightsopenAccessen
dc.subjectpolymerspt_BR
dc.subjectradiation effectspt_BR
dc.subjectionizing radiationspt_BR
dc.subjectmaterials testingpt_BR
dc.subjectelectron beamspt_BR
dc.subjectfoamspt_BR
dc.titleEffect of electron beam radiation dose on the foam formation in pre-ceramic polymerpt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorANA HELENA DE ALMEIDA BRESSIANI
ipen.autorJOSE CARLOS BRESSIANI
ipen.autorESPERIDIANA AUGUSTA BARRETOS DE MOURA
ipen.codigoautor96
ipen.codigoautor1459
ipen.codigoautor1045
ipen.contributor.ipenauthorANA HELENA DE ALMEIDA BRESSIANI
ipen.contributor.ipenauthorJOSE CARLOS BRESSIANI
ipen.contributor.ipenauthorESPERIDIANA AUGUSTA BARRETOS DE MOURA
ipen.date.recebimento10-04pt_BR
ipen.identifier.fi1.132pt_BR
ipen.identifier.ipendoc14850pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.range.fi0.001 - 1.499
ipen.type.genreArtigo
relation.isAuthorOfPublication04d834e7-faee-4461-8fa7-5e5071ec48cc
relation.isAuthorOfPublicationf9cbec71-8864-4175-998d-637777f90c2d
relation.isAuthorOfPublication6bf804a8-aeed-4e9c-bad7-fdec1b1e9a47
relation.isAuthorOfPublication.latestForDiscovery6bf804a8-aeed-4e9c-bad7-fdec1b1e9a47
sigepi.autor.atividadeMOURA, ESPERIDIANA A.B.:1045:220:Npt_BR
sigepi.autor.atividadeBRESSIANI, JOSE C.:1459:720:Npt_BR
sigepi.autor.atividadeBRESSIANI, ANA H.A.:96:720:Npt_BR
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