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 language | English |
|---|---|
| Pages (from-to) | 297-303 |
| Number of pages | 7 |
| Journal | Polymers for Advanced Technologies |
| Volume | 1 |
| Issue number | 5-6 |
| DOIs | |
| Publication status | Published - Jan 1 1990 |
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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 journal › Article
}
TY - JOUR
T1 - Bistable electro‐optical switching for (liquid crystalline polymer)/(low molecular weight liquid crystal) composite system
AU - Kikuchi, Hirotsugu
AU - Moritomi, Satoru
AU - Hwang, Jenn Chiu
AU - Kajiyama, Tisato
PY - 1990/1/1
Y1 - 1990/1/1
N2 - 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).
AB - 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).
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U2 - 10.1002/pat.1990.220010503
DO - 10.1002/pat.1990.220010503
M3 - Article
VL - 1
SP - 297
EP - 303
JO - Polymers for Advanced Technologies
JF - Polymers for Advanced Technologies
SN - 1042-7147
IS - 5-6
ER -