Bistable electro‐optical switching for (liquid crystalline polymer)/(low molecular weight liquid crystal) composite system

Hirotsugu Kikuchi, Satoru Moritomi, Jenn Chiu Hwang, Tisato Kajiyama

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A series of thin films composed of liquid crystalline polymer (LCP) and low molecular weight liquid crystal (LMWLC) was prepared by a solvent‐casting method. LMWLC is miscible over a whole range of LCP concentrations in isotropic and mesomorphic states. The composite system formed a smectic phase in a LCP weight fraction range above 50%. Reversible and bistable electro‐optical effects based on light scattering were recognized for a smectic phase of the binary composite composed of LCP and LMWLC. A light scattering state appeared in the case of application of an a.c. electric field below a threshold frequency (fc). Furthermore, application of an a.c. field above fc made the transmission light intensity increase. Such phenomena were induced in conjunction with the two types of effect: one is an electric field effect based on the dielectric anisotropy of the mesogenic side chain; and the other is an electric current effect based on the electrohydrodynamic motion of the main chain. In the case of a smectic mesophase, the turbid and transparent states remained unchanged, even though the electric field is removed (memory effect).

Original languageEnglish
Pages (from-to)297-303
Number of pages7
JournalPolymers for Advanced Technologies
Volume1
Issue number5-6
DOIs
Publication statusPublished - Jan 1 1990

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Liquid Crystals
Liquid crystal polymers
Liquid crystals
Large scale systems
Molecular weight
Light scattering
Electric fields
Electric field effects
Electrohydrodynamics
Electric currents
Electrooptical effects
Light transmission
Anisotropy
Data storage equipment
Thin films
Composite materials

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics

Cite this

Bistable electro‐optical switching for (liquid crystalline polymer)/(low molecular weight liquid crystal) composite system. / Kikuchi, Hirotsugu; Moritomi, Satoru; Hwang, Jenn Chiu; Kajiyama, Tisato.

In: Polymers for Advanced Technologies, Vol. 1, No. 5-6, 01.01.1990, p. 297-303.

Research output: Contribution to journalArticle

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