Thermo‐electro‐optic switch based on polymer dispersed liquid crystal composite

1992 ◽  
Vol 61 (14) ◽  
pp. 1641-1642 ◽  
Author(s):  
Sukhmal C. Jain ◽  
Ravindra S. Thakur
Keyword(s):  
Liquid Crystal ◽  
Polymer Dispersed Liquid Crystal ◽  
Electro Optic ◽  
Polymer Dispersed ◽  
Crystal Composite

PHASE TRANSITION INVESTIGATIONS IN POLYMER/LIQUID CRYSTAL COMPOSITE MATERIALS

1999 ◽  
Vol 13 (21) ◽  
pp. 759-767 ◽  
Author(s):  
DOINA MANAILA-MAXIMEAN ◽  
MAURIZIO FURLANI ◽  
RODICA BENA ◽  
BENGT-ERIK MELLANDER ◽  
CONSTANTIN ROSU ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Composite Films ◽  
Scanning Calorimetry ◽  
Polymer Dispersed Liquid Crystal ◽  
Polarized Microscopy ◽  
Polymer Dispersed ◽  
Thermally Stimulated Depolarization ◽  
Crystal Composite ◽  
Polymer Liquid Crystal

We prepared polymer dispersed liquid crystal (PDLC) composite films using polymethyl methacrylate (PMMA) and the ferroelectric liquid crystal (LC) Felix 015/000 (Hoechst) by the solvent-induced phase separation method. We studied the phase transitions by the thermally stimulated depolarization currents (TSDC) method and by differential scanning calorimetry (DSC), for the composite film and the corresponding liquid crystal. Polarized microscopy was also used to characterize the phase transitions. When the LC is mixed with the PMMA, its characteristic transition temperatures are shifted down a few degrees and the current peaks revealed by the TSDC method are broadened due to the dispersion of microdroplets and the consequential presence of a large interface between the LC and the polymer matrix.

Electro-Optic Effects in Nanophase Polymer Dispersed Liquid-Crystal Systems

1997 ◽  
Vol 488 ◽  
Author(s):  
R. S. Blacker ◽  
K. L. Lewis ◽  
I. Mason ◽  
I. Sage ◽  
K. Webb
Keyword(s):  
Refractive Index ◽  
Composite Material ◽  
Liquid Crystal ◽  
Spectral Band ◽  
Essential Difference ◽  
New Class ◽  
Polymer Dispersed Liquid Crystal ◽  
Electro Optic ◽  
Polymer Dispersed ◽  
Polymeric Host

AbstractResearch into electro-optic effects in nanophase polymer dispersed liquid crystal (PDLC) materials has highlighted their potential as materials for a new class of tuneable filters. The structures, based on UV cured phase separated composites, contain liquid crystal both as discrete nano-scale droplets, and as material dissolved in the polymeric host. The essential difference between these materials and more conventional PDLC's is the scale of the refractive index inhomogeneity which is considerably smaller than the wavelength of visible light. Based upon effective medium approximations, the composite thus acts as a single isotropic medium, whose average refractive index is dependant on the level of applied electric field. Tuneable filters have been fabricated using the composite material for use in the visible spectral band.

Electro-optic and phase transition studies on polymer-dispersed liquid crystal films

2000 ◽  
Author(s):  
Doina Manaila-Maximean ◽  
Maurizio Furlani ◽  
Rodica Bena ◽  
Victor Stoian ◽  
Constantin Rosu
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Polymer Dispersed Liquid Crystal ◽  
Electro Optic ◽  
Crystal Films ◽  
Polymer Dispersed ◽  
Transition Studies
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