Influence of polymer network in polymer-stabilized ferroelectric liquid crystals and its direct observation using a confocal microscope

2006 ◽  
Vol 99 (1) ◽  
pp. 014102 ◽  
Author(s):  
R. Petkovšek ◽  
J. Pirš ◽  
S. Kralj ◽  
M. Čopič ◽  
D. Šuput
Keyword(s):  
Liquid Crystals ◽  
Direct Observation ◽  
Polymer Network ◽  
Confocal Microscope ◽  
Ferroelectric Liquid Crystals ◽  
Polymer Stabilized

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.

Influence of the Polymer Network on the Switching Behaviors in the Polymer Stabilized Ferroelectric Liquid Crystals

2002 ◽  
Vol 41 (Part 1, No. 10) ◽  
pp. 6011-6015 ◽  
Author(s):  
Janez Pirš ◽  
Philip Bos ◽  
Rok Petkovšek ◽  
Samo Kralj ◽  
Silva Pirš ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Polymer Network ◽  
Ferroelectric Liquid Crystals ◽  
Polymer Stabilized

P‐148: Chiral Polymer Network of Polymer‐stabilized Blue Phase Liquid Crystals

2019 ◽  
Vol 50 (1) ◽  
pp. 1788-1791
Author(s):  
Yifan Feng ◽  
Changli Sun ◽  
Shenghao Zha ◽  
Jiangang Lu
Keyword(s):  
Liquid Crystals ◽  
Polymer Network ◽  
Phase Liquid ◽  
Blue Phase ◽  
Polymer Stabilized ◽  
Chiral Polymer

The Influence of 4,4’-bis[6-(acryloyloxy)-hexyloxy]biphenyl Contents on the Electro-Optical Properties of Polymer Stabilized Liquid Crystals

2013 ◽  
Vol 634-638 ◽  
pp. 2523-2526
Author(s):  
Hui Chang ◽  
Wen Juan Fan ◽  
Xiao Li Liu ◽  
Hong Ying Huo
Keyword(s):  
Optical Properties ◽  
Liquid Crystals ◽  
Response Time ◽  
Polymer Network ◽  
Contrast Ratio ◽  
Monomer Concentration ◽  
Helical Structure ◽  
Switching Process ◽  
Polymer Stabilized ◽  
Structure Of Liquid

The polymer stabilized liquid crystals (PSLC) films was prepared subsequently based on the mesogenic diacrylate monomer 4,4’-bis[6-(acryloyloxy)-hexyloxy]biphenyl (BAB6). The effects of BAB6 on the morphology of polymer network as well as the electro-optical properties of the PSLC films were investigated. The helical structure of liquid crystals was observed in the morphology of polymer network by SEM. Further, a single switching process was observed at lower monomer concentration in this study compared with the former publication. When BAB6 concentration reached 7 %, the response time and contrast ratio of PSLC film were 7 ms and 16.8, respectively.

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