Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer

Controlling nanodomain morphology of nanostructured epoxy thermosets is critical to modulate the mechanical properties of the cross-linked matrix. In this contribution, we demonstrate that this can be achieved by using a suitable block copolymer containing an epoxy soluble block with the ability to...

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Autores principales: Goyanes, Silvia Nair, D'Accorso, Norma Beatriz
Publicado: 2014
Materias:
Epoxy thermosets
Nanodomain
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00249297_v47_n21_p7416_Garate
http://hdl.handle.net/20.500.12110/paper_00249297_v47_n21_p7416_Garate
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_00249297_v47_n21_p7416_Garate2023-06-08T14:52:35Z Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer Goyanes, Silvia Nair D'Accorso, Norma Beatriz Epoxy thermosets Nanodomain Controlling nanodomain morphology of nanostructured epoxy thermosets is critical to modulate the mechanical properties of the cross-linked matrix. In this contribution, we demonstrate that this can be achieved by using a suitable block copolymer containing an epoxy soluble block with the ability to react toward the epoxy system during curing. For this purpose we designed an epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer incorporating amine-reactive functionalities (eSIS-AEP) in the epoxidized block as modifier for an epoxy system, which allowed the formation of nanostructured thermosets with controlled spherelike nanodomain morphology. The eSIS-AEP was obtained in two steps from poly(styrene-b-isoprene-b-styrene) (SIS) block copolymer by controlled epoxidation of the olefinic block followed by partial oxirane ring-opening reaction using 1-(2-aminoethyl)piperazine as nucleophile. Before the curing reaction it was observed that poly(styrene) blocks self-assembled to form ordered spherelike nanostructures in blends of eSIS-AEP with epoxy precursors. Since the amine-reactive moiety was incorporated to the block copolymer so that it could react toward diglicidyl ether of bisphenol A (DGEBA) at a similar temperature than the DGEBA/hardener reaction, the epoxy miscible block of eSIS-AEP (ePI-AEP) was able to react with DGEBA during curing. Once the cross-linked network was formed, the initially obtained spherelike nanodomains were preserved, indicating that no reaction-induced microphase separation of ePI-AEP subchains occurred. A completely different scenario was ascertained for epoxidized SIS block copolymer, which conducted to nonspherical nanodomains due to the uncontrolled epoxidized poly(isoprene) demixing process during the curing reaction. These results demonstrate the importance of the epoxy soluble block being reactive toward the epoxy precursors to control the morphology of the obtained nanostructure. © 2014 American Chemical Society. Fil:Goyanes, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:D'Accorso, N.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00249297_v47_n21_p7416_Garate http://hdl.handle.net/20.500.12110/paper_00249297_v47_n21_p7416_Garate
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Epoxy thermosets
Nanodomain
spellingShingle Epoxy thermosets
Nanodomain
Goyanes, Silvia Nair
D'Accorso, Norma Beatriz
Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer
topic_facet Epoxy thermosets
Nanodomain
description Controlling nanodomain morphology of nanostructured epoxy thermosets is critical to modulate the mechanical properties of the cross-linked matrix. In this contribution, we demonstrate that this can be achieved by using a suitable block copolymer containing an epoxy soluble block with the ability to react toward the epoxy system during curing. For this purpose we designed an epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer incorporating amine-reactive functionalities (eSIS-AEP) in the epoxidized block as modifier for an epoxy system, which allowed the formation of nanostructured thermosets with controlled spherelike nanodomain morphology. The eSIS-AEP was obtained in two steps from poly(styrene-b-isoprene-b-styrene) (SIS) block copolymer by controlled epoxidation of the olefinic block followed by partial oxirane ring-opening reaction using 1-(2-aminoethyl)piperazine as nucleophile. Before the curing reaction it was observed that poly(styrene) blocks self-assembled to form ordered spherelike nanostructures in blends of eSIS-AEP with epoxy precursors. Since the amine-reactive moiety was incorporated to the block copolymer so that it could react toward diglicidyl ether of bisphenol A (DGEBA) at a similar temperature than the DGEBA/hardener reaction, the epoxy miscible block of eSIS-AEP (ePI-AEP) was able to react with DGEBA during curing. Once the cross-linked network was formed, the initially obtained spherelike nanodomains were preserved, indicating that no reaction-induced microphase separation of ePI-AEP subchains occurred. A completely different scenario was ascertained for epoxidized SIS block copolymer, which conducted to nonspherical nanodomains due to the uncontrolled epoxidized poly(isoprene) demixing process during the curing reaction. These results demonstrate the importance of the epoxy soluble block being reactive toward the epoxy precursors to control the morphology of the obtained nanostructure. © 2014 American Chemical Society.
author Goyanes, Silvia Nair
D'Accorso, Norma Beatriz
author_facet Goyanes, Silvia Nair
D'Accorso, Norma Beatriz
author_sort Goyanes, Silvia Nair
title Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer
title_short Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer
title_full Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer
title_fullStr Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer
title_full_unstemmed Controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer
title_sort controlling nanodomain morphology of epoxy thermosets modified with reactive amine-containing epoxidized poly(styrene-b-isoprene-b-styrene) block copolymer
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00249297_v47_n21_p7416_Garate
http://hdl.handle.net/20.500.12110/paper_00249297_v47_n21_p7416_Garate
work_keys_str_mv AT goyanessilvianair controllingnanodomainmorphologyofepoxythermosetsmodifiedwithreactiveaminecontainingepoxidizedpolystyrenebisoprenebstyreneblockcopolymer
AT daccorsonormabeatriz controllingnanodomainmorphologyofepoxythermosetsmodifiedwithreactiveaminecontainingepoxidizedpolystyrenebisoprenebstyreneblockcopolymer
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