Interfacial interaction of polymer/liquid crystal molecules and electrooptical properties of their composite systems

Tisato Kajiyama, Osamu Yonekura, Jun Ichiro Nishiwaki, Hirotsugu Kikuchi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Polymer/liquid crystal composite films were prepared from a solution of polymer and nematic liquid crystal (LC) by a solvent casting method. The phase-separated structure of the composite film was controlled by the solvent evaporation rate. The light-scattering profile of a poly(diisopropyl fumarate)/LC: 40/60 w/w solution during solvent evaporation exhibited a periodic structure, indicating that the phase-separated structure was formed by spinodal decomposition. The aggregation structure of the composite film was investigated with a scanning electron microscope (SEM). SEM observation of the composite film suggested the presence of periodicity and dual connectivity of polymer and LC phases. The faster the solvent was evaporated, the smaller the LC channel (domain) size in the composite film. The composite film, composed of poly(methyl methacrylate) (PMMA) and a nematic LC (E44) with a positive dielectric anisotropy, exhibited remarkable and reversible light-scattering-light-transmission switching, under the modulation of an ac electric field. The light-scattering state was dependent on such optical heterogeneities as spatial distribution of the nematic directors and/or mismatching in the refractive indices of the components. The electrooptical behavior of the composite film was strongly dependent on the LC channel (domain) size in the composite film. The transmittance increased and the rise and decay response times (τrand τD), decreased and increased, respectively, with an increase in the size of the LC channel (domain). The electrooptical switching properties for the polymer/LC composite film should be influenced by miscibility between the polymer and the LC phases. The miscibility between both phases was evaluated from a distribution of relaxation time for interfacial polarization. The anchoring effect was also investigated by measuring the nonlinearity of the dielectric constant for the composite system.

Original languageEnglish
Pages (from-to)1847-1865
Number of pages19
JournalJournal of Macromolecular Science, Part A
Volume31
Issue number11
DOIs
Publication statusPublished - Jan 1 1994

Fingerprint

Liquid crystal polymers
Composite films
Large scale systems
Liquid crystals
Molecules
Liquid Crystals
Light scattering
Nematic liquid crystals
Phase structure
Evaporation
Polymers
Electron microscopes
Solubility
Scanning
liquid crystal polymer
Spinodal decomposition
Fumarates
Control nonlinearities
Periodic structures
Polymethyl Methacrylate

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Interfacial interaction of polymer/liquid crystal molecules and electrooptical properties of their composite systems. / Kajiyama, Tisato; Yonekura, Osamu; Nishiwaki, Jun Ichiro; Kikuchi, Hirotsugu.

In: Journal of Macromolecular Science, Part A, Vol. 31, No. 11, 01.01.1994, p. 1847-1865.

Research output: Contribution to journalArticle

@article{31ab7138b4cd4169be4eabd6e109381b,
title = "Interfacial interaction of polymer/liquid crystal molecules and electrooptical properties of their composite systems",
abstract = "Polymer/liquid crystal composite films were prepared from a solution of polymer and nematic liquid crystal (LC) by a solvent casting method. The phase-separated structure of the composite film was controlled by the solvent evaporation rate. The light-scattering profile of a poly(diisopropyl fumarate)/LC: 40/60 w/w solution during solvent evaporation exhibited a periodic structure, indicating that the phase-separated structure was formed by spinodal decomposition. The aggregation structure of the composite film was investigated with a scanning electron microscope (SEM). SEM observation of the composite film suggested the presence of periodicity and dual connectivity of polymer and LC phases. The faster the solvent was evaporated, the smaller the LC channel (domain) size in the composite film. The composite film, composed of poly(methyl methacrylate) (PMMA) and a nematic LC (E44) with a positive dielectric anisotropy, exhibited remarkable and reversible light-scattering-light-transmission switching, under the modulation of an ac electric field. The light-scattering state was dependent on such optical heterogeneities as spatial distribution of the nematic directors and/or mismatching in the refractive indices of the components. The electrooptical behavior of the composite film was strongly dependent on the LC channel (domain) size in the composite film. The transmittance increased and the rise and decay response times (τrand τD), decreased and increased, respectively, with an increase in the size of the LC channel (domain). The electrooptical switching properties for the polymer/LC composite film should be influenced by miscibility between the polymer and the LC phases. The miscibility between both phases was evaluated from a distribution of relaxation time for interfacial polarization. The anchoring effect was also investigated by measuring the nonlinearity of the dielectric constant for the composite system.",
author = "Tisato Kajiyama and Osamu Yonekura and Nishiwaki, {Jun Ichiro} and Hirotsugu Kikuchi",
year = "1994",
month = "1",
day = "1",
doi = "10.1080/10601329408545886",
language = "English",
volume = "31",
pages = "1847--1865",
journal = "Journal of Macromolecular Science - Pure and Applied Chemistry",
issn = "1060-1325",
publisher = "Taylor and Francis Ltd.",
number = "11",

}

TY - JOUR

T1 - Interfacial interaction of polymer/liquid crystal molecules and electrooptical properties of their composite systems

AU - Kajiyama, Tisato

AU - Yonekura, Osamu

AU - Nishiwaki, Jun Ichiro

AU - Kikuchi, Hirotsugu

PY - 1994/1/1

Y1 - 1994/1/1

N2 - Polymer/liquid crystal composite films were prepared from a solution of polymer and nematic liquid crystal (LC) by a solvent casting method. The phase-separated structure of the composite film was controlled by the solvent evaporation rate. The light-scattering profile of a poly(diisopropyl fumarate)/LC: 40/60 w/w solution during solvent evaporation exhibited a periodic structure, indicating that the phase-separated structure was formed by spinodal decomposition. The aggregation structure of the composite film was investigated with a scanning electron microscope (SEM). SEM observation of the composite film suggested the presence of periodicity and dual connectivity of polymer and LC phases. The faster the solvent was evaporated, the smaller the LC channel (domain) size in the composite film. The composite film, composed of poly(methyl methacrylate) (PMMA) and a nematic LC (E44) with a positive dielectric anisotropy, exhibited remarkable and reversible light-scattering-light-transmission switching, under the modulation of an ac electric field. The light-scattering state was dependent on such optical heterogeneities as spatial distribution of the nematic directors and/or mismatching in the refractive indices of the components. The electrooptical behavior of the composite film was strongly dependent on the LC channel (domain) size in the composite film. The transmittance increased and the rise and decay response times (τrand τD), decreased and increased, respectively, with an increase in the size of the LC channel (domain). The electrooptical switching properties for the polymer/LC composite film should be influenced by miscibility between the polymer and the LC phases. The miscibility between both phases was evaluated from a distribution of relaxation time for interfacial polarization. The anchoring effect was also investigated by measuring the nonlinearity of the dielectric constant for the composite system.

AB - Polymer/liquid crystal composite films were prepared from a solution of polymer and nematic liquid crystal (LC) by a solvent casting method. The phase-separated structure of the composite film was controlled by the solvent evaporation rate. The light-scattering profile of a poly(diisopropyl fumarate)/LC: 40/60 w/w solution during solvent evaporation exhibited a periodic structure, indicating that the phase-separated structure was formed by spinodal decomposition. The aggregation structure of the composite film was investigated with a scanning electron microscope (SEM). SEM observation of the composite film suggested the presence of periodicity and dual connectivity of polymer and LC phases. The faster the solvent was evaporated, the smaller the LC channel (domain) size in the composite film. The composite film, composed of poly(methyl methacrylate) (PMMA) and a nematic LC (E44) with a positive dielectric anisotropy, exhibited remarkable and reversible light-scattering-light-transmission switching, under the modulation of an ac electric field. The light-scattering state was dependent on such optical heterogeneities as spatial distribution of the nematic directors and/or mismatching in the refractive indices of the components. The electrooptical behavior of the composite film was strongly dependent on the LC channel (domain) size in the composite film. The transmittance increased and the rise and decay response times (τrand τD), decreased and increased, respectively, with an increase in the size of the LC channel (domain). The electrooptical switching properties for the polymer/LC composite film should be influenced by miscibility between the polymer and the LC phases. The miscibility between both phases was evaluated from a distribution of relaxation time for interfacial polarization. The anchoring effect was also investigated by measuring the nonlinearity of the dielectric constant for the composite system.

UR - http://www.scopus.com/inward/record.url?scp=0028545505&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028545505&partnerID=8YFLogxK

U2 - 10.1080/10601329408545886

DO - 10.1080/10601329408545886

M3 - Article

AN - SCOPUS:0028545505

VL - 31

SP - 1847

EP - 1865

JO - Journal of Macromolecular Science - Pure and Applied Chemistry

JF - Journal of Macromolecular Science - Pure and Applied Chemistry

SN - 1060-1325

IS - 11

ER -