Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions

Detalhes bibliográficos
Autor(a) principal: d'Almeida,José Roberto Moraes
Data de Publicação: 2003
Outros Autores: Menezes,Gustavo Wagner de, Monteiro,Sérgio Neves
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000300017
Resumo: An investigation was carried out on the room temperature ageing of off-stoichiometric DGEBA/TETA epoxy formulations. The results obtained show that the epoxy rich mixtures have their inherent brittleness increased by the ageing treatment due to recrystalization of the unreacted epoxy monomers, although homopolymerization could also play a minor role. The initial reaction steps dominated by the amine addition reactions control the macromolecular structure and the mechanical performance of the stoichiometric and near stoichiometric formulation with excess of epoxy monomer. Plasticization due to absorbed -OH results on a significant increase of the deformability of these formulations. The amine rich mixtures have the more stable structures, although plasticization due to moisture absorption from the surrounding environment also produces an increase on the deformability of all, but one, of the formulations investigated.
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spelling Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositionsepoxy resinsageingmechanical propertiesAn investigation was carried out on the room temperature ageing of off-stoichiometric DGEBA/TETA epoxy formulations. The results obtained show that the epoxy rich mixtures have their inherent brittleness increased by the ageing treatment due to recrystalization of the unreacted epoxy monomers, although homopolymerization could also play a minor role. The initial reaction steps dominated by the amine addition reactions control the macromolecular structure and the mechanical performance of the stoichiometric and near stoichiometric formulation with excess of epoxy monomer. Plasticization due to absorbed -OH results on a significant increase of the deformability of these formulations. The amine rich mixtures have the more stable structures, although plasticization due to moisture absorption from the surrounding environment also produces an increase on the deformability of all, but one, of the formulations investigated.ABM, ABC, ABPol2003-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000300017Materials Research v.6 n.3 2003reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392003000300017info:eu-repo/semantics/openAccessd'Almeida,José Roberto MoraesMenezes,Gustavo Wagner deMonteiro,Sérgio Neveseng2003-11-28T00:00:00Zoai:scielo:S1516-14392003000300017Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2003-11-28T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
title Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
spellingShingle Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
d'Almeida,José Roberto Moraes
epoxy resins
ageing
mechanical properties
title_short Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
title_full Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
title_fullStr Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
title_full_unstemmed Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
title_sort Ageing of the DGEBA/TETA epoxy system with off-stoichiometric compositions
author d'Almeida,José Roberto Moraes
author_facet d'Almeida,José Roberto Moraes
Menezes,Gustavo Wagner de
Monteiro,Sérgio Neves
author_role author
author2 Menezes,Gustavo Wagner de
Monteiro,Sérgio Neves
author2_role author
author
dc.contributor.author.fl_str_mv d'Almeida,José Roberto Moraes
Menezes,Gustavo Wagner de
Monteiro,Sérgio Neves
dc.subject.por.fl_str_mv epoxy resins
ageing
mechanical properties
topic epoxy resins
ageing
mechanical properties
description An investigation was carried out on the room temperature ageing of off-stoichiometric DGEBA/TETA epoxy formulations. The results obtained show that the epoxy rich mixtures have their inherent brittleness increased by the ageing treatment due to recrystalization of the unreacted epoxy monomers, although homopolymerization could also play a minor role. The initial reaction steps dominated by the amine addition reactions control the macromolecular structure and the mechanical performance of the stoichiometric and near stoichiometric formulation with excess of epoxy monomer. Plasticization due to absorbed -OH results on a significant increase of the deformability of these formulations. The amine rich mixtures have the more stable structures, although plasticization due to moisture absorption from the surrounding environment also produces an increase on the deformability of all, but one, of the formulations investigated.
publishDate 2003
dc.date.none.fl_str_mv 2003-06-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000300017
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392003000300017
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392003000300017
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.6 n.3 2003
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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