Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated

Autores
Hoppe, Cristina Elena; Galante, Maria Jose; Oyanguren, Patricia Angelica; Williams, Roberto Juan Jose
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
As an example of thermoplastic/liquid crystal blends that do not exhibit a liquid-liquid immiscibility region in their phase diagrams, a polystyrene (PS)/N-4-ethoxybenzylidene-4′-butylaniline (EBBA) blend was analyzed. The complete phase diagram was built up using thermal transitions determined by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The boundary of the nematic + isotropic region was fitted with the Flory-Huggins-Maier-Saupe model, extended to consider the polydispersity of PS. Main factors controlling the morphologies generated by thermal-induced phase separation (TIPS) were the initial EBBA concentration in the blend and the cooling rate. Cooling at a fast rate led to small nematic domains with a narrow size distribution. Slow cooling rates led to the coexistence of very large and small dispersed domains. This was because of the large extent of coalescence of the droplets first generated associated with the continuation of the nucleation/growth process in a medium of increasing viscosity. The use of fast cooling rates might be important for the generation of a narrow size-distribution of nematic droplets by TIPS in polymer-dispersed liquid crystals (PDLC) used in electrooptical devices.
Fil: Hoppe, Cristina Elena. 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: Galante, Maria Jose. 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: Oyanguren, Patricia Angelica. 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: Williams, Roberto Juan Jose. 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
Blends
Liquid Crystals
Phase Diagrams
Phase Separation
Polystyrene
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:11336/77595
Acceder
id CONICETDig_e110d2b99c5f12b8836e41b9b630df95
oai_identifier_str oai:ri.conicet.gov.ar:11336/77595
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generatedHoppe, Cristina ElenaGalante, Maria JoseOyanguren, Patricia AngelicaWilliams, Roberto Juan JoseBlendsLiquid CrystalsPhase DiagramsPhase SeparationPolystyrenehttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1https://purl.org/becyt/ford/2.5https://purl.org/becyt/ford/2As an example of thermoplastic/liquid crystal blends that do not exhibit a liquid-liquid immiscibility region in their phase diagrams, a polystyrene (PS)/N-4-ethoxybenzylidene-4′-butylaniline (EBBA) blend was analyzed. The complete phase diagram was built up using thermal transitions determined by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The boundary of the nematic + isotropic region was fitted with the Flory-Huggins-Maier-Saupe model, extended to consider the polydispersity of PS. Main factors controlling the morphologies generated by thermal-induced phase separation (TIPS) were the initial EBBA concentration in the blend and the cooling rate. Cooling at a fast rate led to small nematic domains with a narrow size distribution. Slow cooling rates led to the coexistence of very large and small dispersed domains. This was because of the large extent of coalescence of the droplets first generated associated with the continuation of the nucleation/growth process in a medium of increasing viscosity. The use of fast cooling rates might be important for the generation of a narrow size-distribution of nematic droplets by TIPS in polymer-dispersed liquid crystals (PDLC) used in electrooptical devices.Fil: Hoppe, Cristina Elena. 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: Galante, Maria Jose. 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: Oyanguren, Patricia Angelica. 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: Williams, Roberto Juan Jose. 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; ArgentinaWiley VCH Verlag2003-05-29info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/77595Hoppe, Cristina Elena; Galante, Maria Jose; Oyanguren, Patricia Angelica; Williams, Roberto Juan Jose; Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated; Wiley VCH Verlag; Macromolecular Chemistry And Physics; 204; 7; 29-5-2003; 928-9351022-1352CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/macp.200390069info:eu-repo/semantics/altIdentifier/doi/10.1002/macp.200390069info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:44:03Zoai:ri.conicet.gov.ar:11336/77595instacron: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 09:44:04.16CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
title Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
spellingShingle Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
Hoppe, Cristina Elena
Blends
Liquid Crystals
Phase Diagrams
Phase Separation
Polystyrene
title_short Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
title_full Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
title_fullStr Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
title_full_unstemmed Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
title_sort Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
dc.creator.none.fl_str_mv Hoppe, Cristina Elena
Galante, Maria Jose
Oyanguren, Patricia Angelica
Williams, Roberto Juan Jose
author Hoppe, Cristina Elena
author_facet Hoppe, Cristina Elena
Galante, Maria Jose
Oyanguren, Patricia Angelica
Williams, Roberto Juan Jose
author_role author
author2 Galante, Maria Jose
Oyanguren, Patricia Angelica
Williams, Roberto Juan Jose
author2_role author
author
author
dc.subject.none.fl_str_mv Blends
Liquid Crystals
Phase Diagrams
Phase Separation
Polystyrene
topic Blends
Liquid Crystals
Phase Diagrams
Phase Separation
Polystyrene
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 As an example of thermoplastic/liquid crystal blends that do not exhibit a liquid-liquid immiscibility region in their phase diagrams, a polystyrene (PS)/N-4-ethoxybenzylidene-4′-butylaniline (EBBA) blend was analyzed. The complete phase diagram was built up using thermal transitions determined by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The boundary of the nematic + isotropic region was fitted with the Flory-Huggins-Maier-Saupe model, extended to consider the polydispersity of PS. Main factors controlling the morphologies generated by thermal-induced phase separation (TIPS) were the initial EBBA concentration in the blend and the cooling rate. Cooling at a fast rate led to small nematic domains with a narrow size distribution. Slow cooling rates led to the coexistence of very large and small dispersed domains. This was because of the large extent of coalescence of the droplets first generated associated with the continuation of the nucleation/growth process in a medium of increasing viscosity. The use of fast cooling rates might be important for the generation of a narrow size-distribution of nematic droplets by TIPS in polymer-dispersed liquid crystals (PDLC) used in electrooptical devices.
Fil: Hoppe, Cristina Elena. 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: Galante, Maria Jose. 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: Oyanguren, Patricia Angelica. 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: Williams, Roberto Juan Jose. 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 As an example of thermoplastic/liquid crystal blends that do not exhibit a liquid-liquid immiscibility region in their phase diagrams, a polystyrene (PS)/N-4-ethoxybenzylidene-4′-butylaniline (EBBA) blend was analyzed. The complete phase diagram was built up using thermal transitions determined by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The boundary of the nematic + isotropic region was fitted with the Flory-Huggins-Maier-Saupe model, extended to consider the polydispersity of PS. Main factors controlling the morphologies generated by thermal-induced phase separation (TIPS) were the initial EBBA concentration in the blend and the cooling rate. Cooling at a fast rate led to small nematic domains with a narrow size distribution. Slow cooling rates led to the coexistence of very large and small dispersed domains. This was because of the large extent of coalescence of the droplets first generated associated with the continuation of the nucleation/growth process in a medium of increasing viscosity. The use of fast cooling rates might be important for the generation of a narrow size-distribution of nematic droplets by TIPS in polymer-dispersed liquid crystals (PDLC) used in electrooptical devices.
publishDate 2003
dc.date.none.fl_str_mv 2003-05-29
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/11336/77595
Hoppe, Cristina Elena; Galante, Maria Jose; Oyanguren, Patricia Angelica; Williams, Roberto Juan Jose; Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated; Wiley VCH Verlag; Macromolecular Chemistry And Physics; 204; 7; 29-5-2003; 928-935
1022-1352
CONICET Digital
CONICET
url http://hdl.handle.net/11336/77595
identifier_str_mv Hoppe, Cristina Elena; Galante, Maria Jose; Oyanguren, Patricia Angelica; Williams, Roberto Juan Jose; Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated; Wiley VCH Verlag; Macromolecular Chemistry And Physics; 204; 7; 29-5-2003; 928-935
1022-1352
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/macp.200390069
info:eu-repo/semantics/altIdentifier/doi/10.1002/macp.200390069
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
application/pdf
dc.publisher.none.fl_str_mv Wiley VCH Verlag
publisher.none.fl_str_mv Wiley VCH Verlag
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_ 1842268642720350208
score 13.13397

Publicaciones similares