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

Hoppe, Cristina Elena et al · Wiley VCH Verlag · 2003

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Author / responsible party
Hoppe, Cristina Elena et al
Publisher
Wiley VCH Verlag
Year
2003
ISSN
1022-1352
ISSN
1022-1352
Language
English

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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

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APA 7

Hoppe, C. E. E. A. (2003). Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated. http://hdl.handle.net/11336/77595

MLA

Hoppe, Cristina Elena et al. "Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated." 2003. http://hdl.handle.net/11336/77595.

Chicago

Hoppe, Cristina Elena et al. 2003. "Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated.". http://hdl.handle.net/11336/77595.

Harvard

Hoppe, C. E. E. A. 2003, Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated, Wiley VCH Verlag, available at: http://hdl.handle.net/11336/77595 [Accessed 9 Aug. 2026].

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Title
Polymer-dispersed liquid crystals based on polystyrene and EBBA: Analysis of phase diagrams and morphologies generated
Author / contributors
Hoppe, Cristina Elena et al
Publisher
Wiley VCH Verlag
Publication year
2003
ISSN
1022-1352
ISSN
1022-1352
Language
English

Subjects

Explore related resources through these subjects.

Blends; Liquid Crystals; Phase Diagrams; Phase Separation; Polystyrene; 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
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