Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings

We report an investigation of the mechanisms involved in the formation of nanostructured epoxy thermosetting systems using highly epoxidized poly(styrene-b-isoprene-b-styrene) (eSIS) block copolymer at three different stages of the curing process. In the uncured state, polystyrene (PS) blocks self-a...

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Autores principales: Garate, H., Mondragon, I., D'Accorso, N.B., Goyanes, S.
Formato: JOUR
Materias:
Curing reactions
Demixing process
Different stages
Nano-structured
Organized structure
Short range orders
Thermosetting materials
Thermosetting systems
Block copolymers
Diamond cutting tools
Epoxy resins
Isoprene
Microphase separation
Nanostructures
Polystyrenes
Spheres
Thermosets
Styrene
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00249297_v46_n6_p2182_Garate
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00249297_v46_n6_p2182_Garate2023-10-03T14:35:21Z Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings Garate, H. Mondragon, I. D'Accorso, N.B. Goyanes, S. Curing reactions Demixing process Different stages Nano-structured Organized structure Short range orders Thermosetting materials Thermosetting systems Block copolymers Diamond cutting tools Epoxy resins Isoprene Microphase separation Nanostructures Polystyrenes Spheres Thermosets Styrene We report an investigation of the mechanisms involved in the formation of nanostructured epoxy thermosetting systems using highly epoxidized poly(styrene-b-isoprene-b-styrene) (eSIS) block copolymer at three different stages of the curing process. In the uncured state, polystyrene (PS) blocks self-assembled in sphere-like nanodomains with a short-range order, while epoxidized polyisoprene (ePI) subchains were initially miscible with the epoxy precursors. As the curing reaction proceeded, the PS nanodomains became gradually distorted switching to bigger and less organized structures. This effect is due to reaction-induced microphase separation of ePI subchains which became immiscible with the epoxy system as the curing process occurs. However, this demixing process was partial because of the reaction between ePI subchains and the epoxy matrix, which reduced ePI subchains mobility. Non expulsed ePI fraction increased the epoxy matrix mean glass transition temperature (T g) in (20-25) C. Moreover, it was demonstrated that the epoxidation degree of ePI subchains affected the final obtained nanostructured pattern of the thermosetting materials, switching from distorted and interconnected sphere-like nanodomains when the epoxidation degree is 65% to sphere-like nanostructures for 100% of epoxidation. © 2013 American Chemical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00249297_v46_n6_p2182_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 Curing reactions
Demixing process
Different stages
Nano-structured
Organized structure
Short range orders
Thermosetting materials
Thermosetting systems
Block copolymers
Diamond cutting tools
Epoxy resins
Isoprene
Microphase separation
Nanostructures
Polystyrenes
Spheres
Thermosets
Styrene
spellingShingle Curing reactions
Demixing process
Different stages
Nano-structured
Organized structure
Short range orders
Thermosetting materials
Thermosetting systems
Block copolymers
Diamond cutting tools
Epoxy resins
Isoprene
Microphase separation
Nanostructures
Polystyrenes
Spheres
Thermosets
Styrene
Garate, H.
Mondragon, I.
D'Accorso, N.B.
Goyanes, S.
Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings
topic_facet Curing reactions
Demixing process
Different stages
Nano-structured
Organized structure
Short range orders
Thermosetting materials
Thermosetting systems
Block copolymers
Diamond cutting tools
Epoxy resins
Isoprene
Microphase separation
Nanostructures
Polystyrenes
Spheres
Thermosets
Styrene
description We report an investigation of the mechanisms involved in the formation of nanostructured epoxy thermosetting systems using highly epoxidized poly(styrene-b-isoprene-b-styrene) (eSIS) block copolymer at three different stages of the curing process. In the uncured state, polystyrene (PS) blocks self-assembled in sphere-like nanodomains with a short-range order, while epoxidized polyisoprene (ePI) subchains were initially miscible with the epoxy precursors. As the curing reaction proceeded, the PS nanodomains became gradually distorted switching to bigger and less organized structures. This effect is due to reaction-induced microphase separation of ePI subchains which became immiscible with the epoxy system as the curing process occurs. However, this demixing process was partial because of the reaction between ePI subchains and the epoxy matrix, which reduced ePI subchains mobility. Non expulsed ePI fraction increased the epoxy matrix mean glass transition temperature (T g) in (20-25) C. Moreover, it was demonstrated that the epoxidation degree of ePI subchains affected the final obtained nanostructured pattern of the thermosetting materials, switching from distorted and interconnected sphere-like nanodomains when the epoxidation degree is 65% to sphere-like nanostructures for 100% of epoxidation. © 2013 American Chemical Society.
format JOUR
author Garate, H.
Mondragon, I.
D'Accorso, N.B.
Goyanes, S.
author_facet Garate, H.
Mondragon, I.
D'Accorso, N.B.
Goyanes, S.
author_sort Garate, H.
title Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings
title_short Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings
title_full Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings
title_fullStr Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings
title_full_unstemmed Exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings
title_sort exploring microphase separation behavior of epoxidized poly(styrene-b- isoprene-b-styrene) block copolymer inside thin epoxy coatings
url http://hdl.handle.net/20.500.12110/paper_00249297_v46_n6_p2182_Garate
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