Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process

Autores
Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines; Marieta, C.; Mondragon, I.
Año de publicación
2001
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The curing process of an epoxy-urethane copolymer in a heated mold was studied. The epoxy resin (DGEBA, Araldyt GY9527; Ciba Geigy), was coreacted with a urethane prepolymer (PU, Desmocap 12; Bayer) through an amine that acted as crosslinking agent (mixture of cycloaliphatic amines; Distraltec). The study focused on the effect of the curing condition and PU concentration on time-temperature profiles measured in the mold and the consequent final morphologies obtained. As the PU concentration increases, the maximum temperature reached in the mold decreases as a result of the dilution effect of the elastomer on reaction heat, whereas the Tg of the piece also decreases. Phase separation is a function of conversion and temperature reached in the curing part and was analyzed using experimental data and a mathematical model that predicts temperature and conversion throughout the thickness of the mold. Scanning electron microscopy and atomic force microscopy were used to determine the characteristics of the dispersed phase for the different formulations and conditions of curing. It was shown that the size of the dispersed phase increased with the initial PU concentration, whereas there were practically no differences in the separated phase as a function of position or temperature of curing (in the range of 70 to 100°C studied). The superposition of the phase diagrams with the conversion-temperature trajectories during cure provided an explanation of the morphologies generated.
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
Fil: Marieta, C.. Universidad del País Vasco; España
Fil: Mondragon, I.. Universidad del País Vasco; España
Materia
Curing in Mold
Epoxy-Urethane Copolymers
Modified Epoxy
Phase Separation
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:11336/36799
Acceder
id CONICETDig_834b00ea55b30650dbfc8418b90011ed
oai_identifier_str oai:ri.conicet.gov.ar:11336/36799
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation processStefani, Pablo MarceloMoschiar, Stella MarisAranguren, Mirta InesMarieta, C.Mondragon, I.Curing in MoldEpoxy-Urethane CopolymersModified EpoxyPhase Separationhttps://purl.org/becyt/ford/2.4https://purl.org/becyt/ford/2The curing process of an epoxy-urethane copolymer in a heated mold was studied. The epoxy resin (DGEBA, Araldyt GY9527; Ciba Geigy), was coreacted with a urethane prepolymer (PU, Desmocap 12; Bayer) through an amine that acted as crosslinking agent (mixture of cycloaliphatic amines; Distraltec). The study focused on the effect of the curing condition and PU concentration on time-temperature profiles measured in the mold and the consequent final morphologies obtained. As the PU concentration increases, the maximum temperature reached in the mold decreases as a result of the dilution effect of the elastomer on reaction heat, whereas the Tg of the piece also decreases. Phase separation is a function of conversion and temperature reached in the curing part and was analyzed using experimental data and a mathematical model that predicts temperature and conversion throughout the thickness of the mold. Scanning electron microscopy and atomic force microscopy were used to determine the characteristics of the dispersed phase for the different formulations and conditions of curing. It was shown that the size of the dispersed phase increased with the initial PU concentration, whereas there were practically no differences in the separated phase as a function of position or temperature of curing (in the range of 70 to 100°C studied). The superposition of the phase diagrams with the conversion-temperature trajectories during cure provided an explanation of the morphologies generated.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; ArgentinaFil: Marieta, C.. Universidad del País Vasco; EspañaFil: Mondragon, I.. Universidad del País Vasco; EspañaJohn Wiley & Sons Inc2001-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/36799Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines; Marieta, C.; Mondragon, I.; Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process; John Wiley & Sons Inc; Journal of Applied Polymer Science; 81; 4; 7-2001; 889-9000021-8995CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1002/app.1508/abstractinfo:eu-repo/semantics/altIdentifier/doi/10.1002/app.1508info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:57:30Zoai:ri.conicet.gov.ar:11336/36799instacron: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 09:57:31.123CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
title Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
spellingShingle Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
Stefani, Pablo Marcelo
Curing in Mold
Epoxy-Urethane Copolymers
Modified Epoxy
Phase Separation
title_short Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
title_full Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
title_fullStr Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
title_full_unstemmed Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
title_sort Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process
dc.creator.none.fl_str_mv Stefani, Pablo Marcelo
Moschiar, Stella Maris
Aranguren, Mirta Ines
Marieta, C.
Mondragon, I.
author Stefani, Pablo Marcelo
author_facet Stefani, Pablo Marcelo
Moschiar, Stella Maris
Aranguren, Mirta Ines
Marieta, C.
Mondragon, I.
author_role author
author2 Moschiar, Stella Maris
Aranguren, Mirta Ines
Marieta, C.
Mondragon, I.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Curing in Mold
Epoxy-Urethane Copolymers
Modified Epoxy
Phase Separation
topic Curing in Mold
Epoxy-Urethane Copolymers
Modified Epoxy
Phase Separation
purl_subject.fl_str_mv https://purl.org/becyt/ford/2.4
https://purl.org/becyt/ford/2
dc.description.none.fl_txt_mv The curing process of an epoxy-urethane copolymer in a heated mold was studied. The epoxy resin (DGEBA, Araldyt GY9527; Ciba Geigy), was coreacted with a urethane prepolymer (PU, Desmocap 12; Bayer) through an amine that acted as crosslinking agent (mixture of cycloaliphatic amines; Distraltec). The study focused on the effect of the curing condition and PU concentration on time-temperature profiles measured in the mold and the consequent final morphologies obtained. As the PU concentration increases, the maximum temperature reached in the mold decreases as a result of the dilution effect of the elastomer on reaction heat, whereas the Tg of the piece also decreases. Phase separation is a function of conversion and temperature reached in the curing part and was analyzed using experimental data and a mathematical model that predicts temperature and conversion throughout the thickness of the mold. Scanning electron microscopy and atomic force microscopy were used to determine the characteristics of the dispersed phase for the different formulations and conditions of curing. It was shown that the size of the dispersed phase increased with the initial PU concentration, whereas there were practically no differences in the separated phase as a function of position or temperature of curing (in the range of 70 to 100°C studied). The superposition of the phase diagrams with the conversion-temperature trajectories during cure provided an explanation of the morphologies generated.
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
Fil: Marieta, C.. Universidad del País Vasco; España
Fil: Mondragon, I.. Universidad del País Vasco; España
description The curing process of an epoxy-urethane copolymer in a heated mold was studied. The epoxy resin (DGEBA, Araldyt GY9527; Ciba Geigy), was coreacted with a urethane prepolymer (PU, Desmocap 12; Bayer) through an amine that acted as crosslinking agent (mixture of cycloaliphatic amines; Distraltec). The study focused on the effect of the curing condition and PU concentration on time-temperature profiles measured in the mold and the consequent final morphologies obtained. As the PU concentration increases, the maximum temperature reached in the mold decreases as a result of the dilution effect of the elastomer on reaction heat, whereas the Tg of the piece also decreases. Phase separation is a function of conversion and temperature reached in the curing part and was analyzed using experimental data and a mathematical model that predicts temperature and conversion throughout the thickness of the mold. Scanning electron microscopy and atomic force microscopy were used to determine the characteristics of the dispersed phase for the different formulations and conditions of curing. It was shown that the size of the dispersed phase increased with the initial PU concentration, whereas there were practically no differences in the separated phase as a function of position or temperature of curing (in the range of 70 to 100°C studied). The superposition of the phase diagrams with the conversion-temperature trajectories during cure provided an explanation of the morphologies generated.
publishDate 2001
dc.date.none.fl_str_mv 2001-07
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/11336/36799
Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines; Marieta, C.; Mondragon, I.; Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process; John Wiley & Sons Inc; Journal of Applied Polymer Science; 81; 4; 7-2001; 889-900
0021-8995
CONICET Digital
CONICET
url http://hdl.handle.net/11336/36799
identifier_str_mv Stefani, Pablo Marcelo; Moschiar, Stella Maris; Aranguren, Mirta Ines; Marieta, C.; Mondragon, I.; Curing of epoxy-urethane copolymers in a heated mold: Effect of the curing conditions on the phase-separation process; John Wiley & Sons Inc; Journal of Applied Polymer Science; 81; 4; 7-2001; 889-900
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.1508/abstract
info:eu-repo/semantics/altIdentifier/doi/10.1002/app.1508
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
application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons Inc
publisher.none.fl_str_mv John Wiley & Sons Inc
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
_version_ 1842269466311786496
score 13.13397

Publicaciones similares