Epoxy-urethane copolymers: Relation between morphology and properties

Autores
Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The modification of an amine-cured epoxy resin by the addition of polyurethanes (PU) was investigated, and their mechanical and impact properties were related to their microstructure and morphology. For the study, two different PU were selected: a commercial sample, D12, with a NCO : OH ratio equal to 2 and end blocked by reaction with an alkylphenol; and a synthesized sample, with NCO : OH ratio equal to 1 and equally end blocked in our laboratory. The usual trend of improved toughening and reduced modulus, EF, and compression yield stress, σYC, was observed in all samples. However, the toughening of the D12-modified samples was larger for the same initial rubber content. This result correlates with a finer rubber particle separation, but also the ductilization effect that this rubber has on the epoxy-rich phase. D12 co-reacts with the epoxy-amine, leading to a lower glass transition temperature (Tg) of the modified system and incomplete phase separation, as observed by scanning electron microscopy. The practically unreactive PU1 rubber leads to the usual spherical inclusion morphology observed in modified epoxies, except at 20% rubber content. The particular morphology generated in this case, co-continuous epoxy-rich and rubber-rich regions, leads to a material with the largest toughening in this study, but also with an impressive reduction in mechanical properties.
Fil: Stefani, Pablo Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Moschiar, Stella Maris. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Aranguren, Mirta Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Materia
Blocked Urethane Prepolymer
Modified Epoxy
Phase Separation
Urethane-Epoxy Copolymers
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/36675
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/36675
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Epoxy-urethane copolymers: Relation between morphology and propertiesStefani, Pablo MarceloMoschiar, Stella MarisAranguren, Mirta InesBlocked Urethane PrepolymerModified EpoxyPhase SeparationUrethane-Epoxy Copolymershttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1https://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2The modification of an amine-cured epoxy resin by the addition of polyurethanes (PU) was investigated, and their mechanical and impact properties were related to their microstructure and morphology. For the study, two different PU were selected: a commercial sample, D12, with a NCO : OH ratio equal to 2 and end blocked by reaction with an alkylphenol; and a synthesized sample, with NCO : OH ratio equal to 1 and equally end blocked in our laboratory. The usual trend of improved toughening and reduced modulus, EF, and compression yield stress, σYC, was observed in all samples. However, the toughening of the D12-modified samples was larger for the same initial rubber content. This result correlates with a finer rubber particle separation, but also the ductilization effect that this rubber has on the epoxy-rich phase. D12 co-reacts with the epoxy-amine, leading to a lower glass transition temperature (Tg) of the modified system and incomplete phase separation, as observed by scanning electron microscopy. The practically unreactive PU1 rubber leads to the usual spherical inclusion morphology observed in modified epoxies, except at 20% rubber content. The particular morphology generated in this case, co-continuous epoxy-rich and rubber-rich regions, leads to a material with the largest toughening in this study, but also with an impressive reduction in mechanical properties.Fil: Stefani, Pablo Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Moschiar, Stella Maris. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaFil: Aranguren, Mirta Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; ArgentinaWiley2001-09-20info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/36675Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines; Epoxy-urethane copolymers: Relation between morphology and properties; Wiley; Journal of Applied Polymer Science; 82; 10; 20-9-2001; 2544-25520021-8995CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/app.2105/fullinfo:eu-repo/semantics/altIdentifier/doi/10.1002/app.2105info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:55:59Zoai:ri.conicet.gov.ar:11336/36675instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:55:59.924CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Epoxy-urethane copolymers: Relation between morphology and properties
title Epoxy-urethane copolymers: Relation between morphology and properties
spellingShingle Epoxy-urethane copolymers: Relation between morphology and properties
Stefani, Pablo Marcelo
Blocked Urethane Prepolymer
Modified Epoxy
Phase Separation
Urethane-Epoxy Copolymers
title_short Epoxy-urethane copolymers: Relation between morphology and properties
title_full Epoxy-urethane copolymers: Relation between morphology and properties
title_fullStr Epoxy-urethane copolymers: Relation between morphology and properties
title_full_unstemmed Epoxy-urethane copolymers: Relation between morphology and properties
title_sort Epoxy-urethane copolymers: Relation between morphology and properties
dc.creator.none.fl_str_mv Stefani, Pablo Marcelo
Moschiar, Stella Maris
Aranguren, Mirta Ines
author Stefani, Pablo Marcelo
author_facet Stefani, Pablo Marcelo
Moschiar, Stella Maris
Aranguren, Mirta Ines
author_role author
author2 Moschiar, Stella Maris
Aranguren, Mirta Ines
author2_role author
author
dc.subject.none.fl_str_mv Blocked Urethane Prepolymer
Modified Epoxy
Phase Separation
Urethane-Epoxy Copolymers
topic Blocked Urethane Prepolymer
Modified Epoxy
Phase Separation
Urethane-Epoxy Copolymers
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
https://purl.org/becyt/ford/2.5
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The modification of an amine-cured epoxy resin by the addition of polyurethanes (PU) was investigated, and their mechanical and impact properties were related to their microstructure and morphology. For the study, two different PU were selected: a commercial sample, D12, with a NCO : OH ratio equal to 2 and end blocked by reaction with an alkylphenol; and a synthesized sample, with NCO : OH ratio equal to 1 and equally end blocked in our laboratory. The usual trend of improved toughening and reduced modulus, EF, and compression yield stress, σYC, was observed in all samples. However, the toughening of the D12-modified samples was larger for the same initial rubber content. This result correlates with a finer rubber particle separation, but also the ductilization effect that this rubber has on the epoxy-rich phase. D12 co-reacts with the epoxy-amine, leading to a lower glass transition temperature (Tg) of the modified system and incomplete phase separation, as observed by scanning electron microscopy. The practically unreactive PU1 rubber leads to the usual spherical inclusion morphology observed in modified epoxies, except at 20% rubber content. The particular morphology generated in this case, co-continuous epoxy-rich and rubber-rich regions, leads to a material with the largest toughening in this study, but also with an impressive reduction in mechanical properties.
Fil: Stefani, Pablo Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Moschiar, Stella Maris. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
Fil: Aranguren, Mirta Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Ciencia y Tecnología de Materiales. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Instituto de Investigaciones en Ciencia y Tecnología de Materiales; Argentina
description The modification of an amine-cured epoxy resin by the addition of polyurethanes (PU) was investigated, and their mechanical and impact properties were related to their microstructure and morphology. For the study, two different PU were selected: a commercial sample, D12, with a NCO : OH ratio equal to 2 and end blocked by reaction with an alkylphenol; and a synthesized sample, with NCO : OH ratio equal to 1 and equally end blocked in our laboratory. The usual trend of improved toughening and reduced modulus, EF, and compression yield stress, σYC, was observed in all samples. However, the toughening of the D12-modified samples was larger for the same initial rubber content. This result correlates with a finer rubber particle separation, but also the ductilization effect that this rubber has on the epoxy-rich phase. D12 co-reacts with the epoxy-amine, leading to a lower glass transition temperature (Tg) of the modified system and incomplete phase separation, as observed by scanning electron microscopy. The practically unreactive PU1 rubber leads to the usual spherical inclusion morphology observed in modified epoxies, except at 20% rubber content. The particular morphology generated in this case, co-continuous epoxy-rich and rubber-rich regions, leads to a material with the largest toughening in this study, but also with an impressive reduction in mechanical properties.
publishDate 2001
dc.date.none.fl_str_mv 2001-09-20
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/36675
Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines; Epoxy-urethane copolymers: Relation between morphology and properties; Wiley; Journal of Applied Polymer Science; 82; 10; 20-9-2001; 2544-2552
0021-8995
CONICET Digital
CONICET
url http://hdl.handle.net/11336/36675
identifier_str_mv Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines; Epoxy-urethane copolymers: Relation between morphology and properties; Wiley; Journal of Applied Polymer Science; 82; 10; 20-9-2001; 2544-2552
0021-8995
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/app.2105/full
info:eu-repo/semantics/altIdentifier/doi/10.1002/app.2105
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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