Electro-Optic Response in a Racemic Smectic C Liquid Crystal

2005 ◽  
Vol 17 (8) ◽  
pp. 1077-1080 ◽  
Author(s):  
S. J. Cowling ◽  
A. W. Hall ◽  
J. W. Goodby
Keyword(s):  
Liquid Crystal ◽  
Smectic C ◽  
Electro Optic

Formation of Polymer Stabilized Ferroelectric Liquid Crystals using a Fluorinated Diacrylate

1999 ◽  
Vol 559 ◽  
Author(s):  
C. Allan Guymon ◽  
Christopher N. Bowman ◽  
Christopher N. Bowman
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Polymer Network ◽  
Isotropic Phase ◽  
Ferroelectric Liquid Crystals ◽  
Smectic C ◽  
Electro Optic ◽  
Polymerization Behavior ◽  
Mechanically Stabilized ◽  
Polymer Stabilized

ABSTRACTFerroelectric liquid crystals (FLCs) have shown great potential for use in electro-optic and display technology due to their inherently fast switching speeds and bistability. Recently, considerable research has been devoted to FLCs mechanically stabilized by a polymer network. The network is formed typically by in situ polymerization of a monomer dissolved in the FLC. Because of the inherent order in the FLC, the polymerization behavior may be significantly different than what might be expected in solution polymerizations. These deviations result largely from the segregation properties of the monomer in the liquid crystal. One class of monomers, namely fluorinated acrylates, is a likely candidate for inducing novel segregation, polymerization and electro-optic behavior in polymer stabilized ferroelectric liquid crystals (PSFLCs). The use of fluorinated moieties has a significant impact on the phase and polymerization behavior of liquid crystal systems. This study focuses on the polymerization of a fluorinated diacrylate, octafluoro 1,6-hexanediol diacrylate (FHDDA), to form PSFLCs and the consequent impact of the polymerization on the ultimate performance. Interestingly, as the temperature is increased and the order of the system decreases, a dramatic increase in the polymerization rate is observed. This increase is especially prominent for polymerizations in the smectic C* phase for which the rate is more than five times that exhibited at much higher temperatures in the isotropic phase. As with other monomer/FLC systems, the segregation of the monomer plays a role in this polymerization behavior as the monomer segregates between the smectic layers of the liquid crystal. The segregation properties also significantly impact the ultimate electro-optic properties. Both ferroelectric polarization and response time of the PSFLC change markedly with different polymerization temperatures, and approach values very close to those of the neat FLC under appropriate polymerization conditions. This behavior not only provides a unique mechanism for rate acceleration in PSFLCs, but also paves the way for new methods to optimize performance in these materials.

Ferroelectric smectic C liquid crystal mixtures: Relationship between molecular structure, ferroelectricity and electro-optic response

1989 ◽  
Vol 5 (4) ◽  
pp. 1179-1186 ◽  
Author(s):  
F. Leenhouts ◽  
J. Fuenfschilling ◽  
R. Buchecker ◽  
S. M. Kelly
Keyword(s):  
Molecular Structure ◽  
Liquid Crystal ◽  
Smectic C ◽  
Electro Optic

Electro-optic and dielectric properties of polymer networks stabilised short pitch chiral smectic C* liquid crystal

2020 ◽  
pp. 1-16
Author(s):  
Jamal Hemine ◽  
Abdelhamid El Kaaouachi ◽  
Mimoun Ismaili ◽  
Redouane Douali ◽  
Christian Legrand ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Dielectric Properties ◽  
Polymer Networks ◽  
Smectic C ◽  
Electro Optic
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