The Optical and Morphological Properties of Fluorinated Polymer Dispersed Liquid Crystals

1999 ◽  
Vol 559 ◽  
Author(s):  
M.D. Schulte ◽  
S.J. Clarson ◽  
L.V. Natarajan ◽  
V.P. Tondiglia ◽  
T.J. Bunning
Keyword(s):  
Liquid Crystal ◽  
Contrast Ratio ◽  
Morphological Properties ◽  
Fluorinated Polymer ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Methacrylate Monomer ◽  
Morphological Differences ◽  
Incremental Addition

ABSTRACTPolymer dispersed liquid crystal (PDLC) films with a partially fluorinated polymer matrix were investigated. The optical and morphological properties of fluorinated PDLC's were different from non-fluorinated films. The incremental addition of a fluorine-substituted monofunctional methacrylate monomer to a pentaacrylate-based standard PDLC formulation resulted in significant improvement in contrast ratio. In addition, results suggest that fluorine decreased compatibility between the polymer and liquid crystal phases. Scanning electron microscopy (SEM) was employed to elucidate morphological differences between fluorinated host matrices and non-fluorinated control films.

Holographic Polymer Dispersed Liquid Crystals: Effect of Partial Matrix Fluorination on Electro-Optical and Morphological Properties

2001 ◽  
Vol 709 ◽  
Author(s):  
Michael D. Schulte ◽  
Stephen J. Clarson ◽  
Lalgudi V. Natarajan ◽  
C. Allan Guymon ◽  
Timothy J. Bunning
Keyword(s):  
Liquid Crystal ◽  
Low Voltage ◽  
Morphological Properties ◽  
Acrylate Monomer ◽  
Polymer Dispersed Liquid Crystal ◽  
Morphological Studies ◽  
Polymer Dispersed Liquid Crystals ◽  
The Matrix ◽  
Polymer Dispersed ◽  
Morphological Differences

ABSTRACTHolographic polymer dispersed liquid crystal (H-PDLC) films with partially fluorinated matrices were investigated. Electro-optical and morphological studies revealed that fluorinated composites were substantially different from non-fluorinated analogues. The addition of a fluorinated monofunctional acrylate monomer to a pentaacrylate-derived polymer matrix resulted in improved diffraction efficiency. These findings suggest that the partial fluorination of the host polymer decreases the compatibility between the matrix and liquid crystal phase. Morphological differences between fluorinated films and non-fluorinated control specimens were verified using low-voltage, high-resolution scanning electron microscopy (LVHRSEM).

scholarly journals Recent Advances in The Polymer Dispersed Liquid Crystal Composite and Its Applications

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5510 ◽  
Author(s):  
Mohsin Hassan Saeed ◽  
Shuaifeng Zhang ◽  
Yaping Cao ◽  
Le Zhou ◽  
Junmei Hu ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Contrast Ratio ◽  
Operating Voltage ◽  
Low Contrast ◽  
Practical Applications ◽  
Polymer Dispersed Liquid Crystal ◽  
Controlled Switching ◽  
Recent Advances ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed

Polymer dispersed liquid crystals (PDLCs) have kindled a spark of interest because of their unique characteristic of electrically controlled switching. However, some issues including high operating voltage, low contrast ratio and poor mechanical properties are hindering their practical applications. To overcome these drawbacks, some measures were taken such as molecular structure optimization of the monomers and liquid crystals, modification of PDLC and doping of nanoparticles and dyes. This review aims at detailing the recent advances in the process, preparations and applications of PDLCs over the past six years.

Studies of polymer ball type polymer dispersed liquid crystal films

1996 ◽  
Vol 425 ◽  
Author(s):  
S. J. Chang ◽  
Y. C. Yin ◽  
C. M. Lin ◽  
A. Y. G. Fuh
Keyword(s):  
Liquid Crystal ◽  
Distinct Type ◽  
Micro Structure ◽  
Display Devices ◽  
Liquid Crystal Films ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed Liquid Crystals ◽  
Crystal Films ◽  
Polymer Dispersed ◽  
Optical Behavior

AbstractPolymer dispersed liquid crystals ( PDLC ) are potentially useful as new types of display devices. By applying an electric field, one can switch the PDLC cell from a highly scattering opaque state to a transparent state. Normal PDLC cells consist of liquid crystal droplets, having sizes on the order of micrometers, embedded in a transparent polymer matrix. In this paper, we report the development of a new kind of PDLC cell with a distinct type of polymer morphology, teferred to as “reverse ” or “polymer ball ” type. The electro-optical behavior and the micro structure of the PDLC films were investigated by a He-Ne laser and the scanning electron microscopy ( SEA ) respectively.

Photomechanical response of polymer-dispersed liquid crystals/graphene oxide nanocomposites

2014 ◽  
Vol 2 (40) ◽  
pp. 8501-8506 ◽  
Author(s):  
Li Yu ◽  
Zhangxiang Cheng ◽  
Zhijiao Dong ◽  
Yihe Zhang ◽  
Haifeng Yu
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystal ◽  
Visible Light ◽  
Nanocomposite Films ◽  
Solution Casting ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed Liquid Crystals ◽  
Responsive Polymer ◽  
Polymer Dispersed ◽  
Mechanical Stretching

Recyclable, fast and visible-light responsive polymer-dispersed liquid crystal/graphene oxide nanocomposite films were fabricated by solution casting and mechanical stretching.

Viewing Angle Measurement of Polymer-Dispersed Liquid Crystal

2011 ◽  
Vol 181-182 ◽  
pp. 79-82
Author(s):  
Xing Fang Jiang ◽  
Shu Xin Wu
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Angle Measurement ◽  
Driving Voltage ◽  
Viewing Angle ◽  
Liquid Crystal Device ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed Liquid Crystals ◽  
Voltage Dependent ◽  
Polymer Dispersed

Polymer-dispersed liquid crystals are one kind of important devices. With a He-Ne laser and a photoelectric detector, we measured the driving-voltage dependent and viewing-angle dependent transmission for a polymer-dispersed liquid crystal device. Our results showed that the polymer-dispersed liquid crystal device worked at the driving voltage of 4 V and the effective viewing angle of about 65 degree.

High pump efficiency of a second-order distributed feedback laser based on holographic polymer dispersed liquid crystals with preferred liquid crystal molecular orientation

2018 ◽  
Vol 6 (35) ◽  
pp. 9517-9522 ◽  
Author(s):  
Lijuan Liu ◽  
Xiaobo Kong ◽  
Qidong Wang ◽  
Yonggang Liu ◽  
Li Xuan
Keyword(s):  
Liquid Crystal ◽  
Distributed Feedback ◽  
Pump Efficiency ◽  
Transmission Grating ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
High Pump ◽  
Organic Semiconductor Laser

We report on the fabrication and characterization of a surface-emitting distributed feedback (DFB) organic semiconductor laser based on a holographic polymer dispersed liquid crystal (HPDLC) transmission grating.

Design and Study of Optical Devices Based on Holographic Polymer Dispersed Liquid Crystal Technology

2010 ◽  
Vol 428-429 ◽  
pp. 356-362
Author(s):  
Ji Hong Zheng ◽  
Ken Wen ◽  
Ling Juan Gu ◽  
Song Lin Zhuang
Keyword(s):  
Liquid Crystal ◽  
Polymer Matrix ◽  
Optical Communications ◽  
High Speed ◽  
Optical Devices ◽  
Frequency Division ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Dynamic Gain

Micro/nanoscale liquid crystal (LC) droplets are dispersed within polymer matrix, known as polymer-dispersed liquid crystals (PDLCs). LC molecules can be reoriented under an applied voltage, which makes PDLC-based devices have wide applications in optical communications, integrated optics, and panel displays, etc. In this paper, we summarized our work on holographic PDLC (H-PDLC) devices including variable attenuators, dynamic gain equalizers and focus-switchable lenses. More importantly, a specially designed H-PDLC chopper array was demonstrated, which will be applied in the new-born frequency division multiplexed high-speed fluorescence confocal microscope system.

Sign in / Sign up

Export Citation Format

Share Document