Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets
n the present work, we report the preparation and characterization of a new family of thermosets based on off-stoichiometric anhydride–epoxy formulations in the presence of an anionic initiator. Diglycidyl ether of bisphenol A (DGEBA) and hexahydro-4-methylphthalic anhydride (HHMPA) have been used a...
| Autores: | , , , , , |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/176592 |
| Acesso em linha: | https://hdl.handle.net/2117/176592 https://dx.doi.org/10.1007/s10973-019-08681-z |
| Access Level: | acceso abierto |
| Palavra-chave: | Polymers Heat resistant plastics Epoxy networks Isothermal cure Kinetics Gelation Polímers Plàstics termostables Àrees temàtiques de la UPC::Física Àrees temàtiques de la UPC::Enginyeria química::Química física Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers |
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Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosetsMorancho Llena, José María|||0000-0002-9416-3657Ramis Juan, Xavier|||0000-0003-2550-7185Fernández Francos, Xavier|||0000-0002-3492-2922Salla Tarragó, José María|||0000-0002-5409-8416Konuray, Ali Osman|||0000-0001-7281-006XSerra Albet, Maria Àngels|||0000-0003-1387-0358PolymersHeat resistant plasticsEpoxy networksIsothermal cureKineticsGelationPolímersPlàstics termostablesÀrees temàtiques de la UPC::FísicaÀrees temàtiques de la UPC::Enginyeria química::Química físicaÀrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímersn the present work, we report the preparation and characterization of a new family of thermosets based on off-stoichiometric anhydride–epoxy formulations in the presence of an anionic initiator. Diglycidyl ether of bisphenol A (DGEBA) and hexahydro-4-methylphthalic anhydride (HHMPA) have been used as epoxy and anhydride comonomers, respectively, and 1-methylimidazole (1MI) has been used as anionic initiator. The isothermal curing kinetics and the thermal properties of the stoichiometric and the off-stoichiometric systems have been compared. The kinetics of the isothermal curing has been analyzed by differential scanning calorimetry (DSC) using an isoconversional method and the S ¿esta ´k–Berggren equation to determine the activation energy, the frequency factor and the reaction orders. The materials obtained were characterized by DSC and dynamic mechanical analysis. Gelation during epoxy–anhydride condensation was determined by thermomechanical analysis. At the same curing temperature, the reaction is faster in the system with excess of epoxy groups. However, the glass transition temperatures of the partially cured stoichiometric system are greater. The gelation time of the off-stoichiometric system is shorter than that of the stoichiometric one. The results indicate that the dual-curing character of off-stoichiometric DGEBA/HHMPA thermosets with 1MI as anionic initiator makes them suitable for multistage curing processes with easy control of degree of cure and material properties in the intermediate stage and enhanced ¿nal material properties.Springer20192019-11-0120202020-02-04journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/176592https://dx.doi.org/10.1007/s10973-019-08681-zreponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1765922026-05-27T15:37:01Z |
| dc.title.none.fl_str_mv |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets |
| title |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets |
| spellingShingle |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets Morancho Llena, José María|||0000-0002-9416-3657 Polymers Heat resistant plastics Epoxy networks Isothermal cure Kinetics Gelation Polímers Plàstics termostables Àrees temàtiques de la UPC::Física Àrees temàtiques de la UPC::Enginyeria química::Química física Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers |
| title_short |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets |
| title_full |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets |
| title_fullStr |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets |
| title_full_unstemmed |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets |
| title_sort |
Curing and thermomechanical properties of off-stoichiometric anhydride-epoxy thermosets |
| dc.creator.none.fl_str_mv |
Morancho Llena, José María|||0000-0002-9416-3657 Ramis Juan, Xavier|||0000-0003-2550-7185 Fernández Francos, Xavier|||0000-0002-3492-2922 Salla Tarragó, José María|||0000-0002-5409-8416 Konuray, Ali Osman|||0000-0001-7281-006X Serra Albet, Maria Àngels|||0000-0003-1387-0358 |
| author |
Morancho Llena, José María|||0000-0002-9416-3657 |
| author_facet |
Morancho Llena, José María|||0000-0002-9416-3657 Ramis Juan, Xavier|||0000-0003-2550-7185 Fernández Francos, Xavier|||0000-0002-3492-2922 Salla Tarragó, José María|||0000-0002-5409-8416 Konuray, Ali Osman|||0000-0001-7281-006X Serra Albet, Maria Àngels|||0000-0003-1387-0358 |
| author_role |
author |
| author2 |
Ramis Juan, Xavier|||0000-0003-2550-7185 Fernández Francos, Xavier|||0000-0002-3492-2922 Salla Tarragó, José María|||0000-0002-5409-8416 Konuray, Ali Osman|||0000-0001-7281-006X Serra Albet, Maria Àngels|||0000-0003-1387-0358 |
| author2_role |
author author author author author |
| dc.subject.none.fl_str_mv |
Polymers Heat resistant plastics Epoxy networks Isothermal cure Kinetics Gelation Polímers Plàstics termostables Àrees temàtiques de la UPC::Física Àrees temàtiques de la UPC::Enginyeria química::Química física Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers |
| topic |
Polymers Heat resistant plastics Epoxy networks Isothermal cure Kinetics Gelation Polímers Plàstics termostables Àrees temàtiques de la UPC::Física Àrees temàtiques de la UPC::Enginyeria química::Química física Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers |
| description |
n the present work, we report the preparation and characterization of a new family of thermosets based on off-stoichiometric anhydride–epoxy formulations in the presence of an anionic initiator. Diglycidyl ether of bisphenol A (DGEBA) and hexahydro-4-methylphthalic anhydride (HHMPA) have been used as epoxy and anhydride comonomers, respectively, and 1-methylimidazole (1MI) has been used as anionic initiator. The isothermal curing kinetics and the thermal properties of the stoichiometric and the off-stoichiometric systems have been compared. The kinetics of the isothermal curing has been analyzed by differential scanning calorimetry (DSC) using an isoconversional method and the S ¿esta ´k–Berggren equation to determine the activation energy, the frequency factor and the reaction orders. The materials obtained were characterized by DSC and dynamic mechanical analysis. Gelation during epoxy–anhydride condensation was determined by thermomechanical analysis. At the same curing temperature, the reaction is faster in the system with excess of epoxy groups. However, the glass transition temperatures of the partially cured stoichiometric system are greater. The gelation time of the off-stoichiometric system is shorter than that of the stoichiometric one. The results indicate that the dual-curing character of off-stoichiometric DGEBA/HHMPA thermosets with 1MI as anionic initiator makes them suitable for multistage curing processes with easy control of degree of cure and material properties in the intermediate stage and enhanced ¿nal material properties. |
| publishDate |
2019 |
| dc.date.none.fl_str_mv |
2019 2019-11-01 2020 2020-02-04 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 AM http://purl.org/coar/version/c_ab4af688f83e57aa |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/176592 https://dx.doi.org/10.1007/s10973-019-08681-z |
| url |
https://hdl.handle.net/2117/176592 https://dx.doi.org/10.1007/s10973-019-08681-z |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
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openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
Springer |
| publisher.none.fl_str_mv |
Springer |
| dc.source.none.fl_str_mv |
reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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Universitat Politècnica de Catalunya (UPC) |
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UPCommons. Portal del coneixement obert de la UPC |
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UPCommons. Portal del coneixement obert de la UPC |
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15,300719 |