Liquid Crystal/Polymer Composites: Kinetic Study of the Grating Formation in Holographic Polymer-Dispersed Liquid Crystals

2011 ◽  
Vol 547 (1) ◽  
pp. 97/[1787]-107/[1797] ◽  
Author(s):  
Andreas Redler ◽  
Andreas Hoischen ◽  
Heinz Kitzerow
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Kinetic Study ◽  
Polymer Composites ◽  
Liquid Crystal Polymer ◽  
Crystal Polymer ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Grating Formation

NMR Characterization of Liquid Crystal—Polymer Interactions in Polymer-Dispersed Liquid Crystals

1997 ◽  
Vol 51 (11) ◽  
pp. 1639-1643 ◽  
Author(s):  
Peter A. Mirau ◽  
Mohan Srentvasarao
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Liquid Crystal Polymer ◽  
Butyl Methacrylate ◽  
Magic Angle ◽  
Crystal Polymer ◽  
Nmr Characterization ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Polymer Interactions

Solid-state nuclear magnetic resonance (NMR) and optical microscopy have been used to study liquid crystal–polymer interactions in polymer-dispersed liquid crystals (PDLCs) composed of the E7 liquid crystal mixture and poly( n-butyl methacrylate) or poly(isobutyl methacrylate). As previously reported, the droplets adopt a bipolar configuration in the PDLCs using poly( n-butyl methacrylate) as the matrix material and a radial configuration in those using poly(isobutyl methacrylate). The NMR signals from the E7 cannot be detected in the bulk state by using magic angle spinning and cross-polarization because of its liquid-like properties. The E7 and the polymer signals are only weakly cross-polarized in 60:40 E7/poly( n-butyl methacrylate) PDLCs but are strongly cross-polarized in the PDLCs with poly(isobutyl methacrylate). We suggest that the differences are due to a change in the surface-anchoring conditions and that NMR spectroscopy may provide a molecular-level probe of the forces that control droplet configuration and the electro-optical properties of these materials.

An electrically light-transmittance-switchable film with a low driving voltage based on liquid crystal/polymer composites

2019 ◽  
Vol 47 (1) ◽  
pp. 106-113 ◽  
Author(s):  
Chunxin Li ◽  
Mei Chen ◽  
Lanying Zhang ◽  
Wenbo Shen ◽  
Xiao Liang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Polymer Composites ◽  
Liquid Crystal Polymer ◽  
Light Transmittance ◽  
Driving Voltage ◽  
Crystal Polymer

Electrical conductivity and rheology of carbon fiber/liquid crystal polymer composites

2007 ◽  
Vol 28 (2) ◽  
pp. 168-174 ◽  
Author(s):  
Julia A. King ◽  
Jason M. Keith ◽  
Ryan C. Smith ◽  
Faith A. Morrison
Keyword(s):  
Electrical Conductivity ◽  
Liquid Crystal ◽  
Carbon Fiber ◽  
Polymer Composites ◽  
Liquid Crystal Polymer ◽  
Crystal Polymer

Hidden Gratings in Holographic Liquid Crystal Polymer-Dispersed Liquid Crystal Films

2018 ◽  
Vol 10 (15) ◽  
pp. 13107-13112 ◽  
Author(s):  
Luciano De Sio ◽  
Pamela F. Lloyd ◽  
Nelson V. Tabiryan ◽  
Timothy J. Bunning
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Polymer ◽  
Liquid Crystal Films ◽  
Polymer Dispersed Liquid Crystal ◽  
Crystal Polymer ◽  
Crystal Films ◽  
Polymer Dispersed

Electrically switchable reflection gratings in polymer dispersed liquid crystals

1999 ◽  
Vol 559 ◽  
Author(s):  
L. V. Natarajan ◽  
R. L. Sutherland ◽  
V. P. Tondiglia ◽  
S. Siwecki ◽  
R. Pogue ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Field ◽  
Low Voltage ◽  
Blue Shift ◽  
Maximum Efficiency ◽  
Acrylate Monomer ◽  
Polymer Dispersed ◽  
Reflection Gratings ◽  
Grating Formation

ABSTRACTElectrically switchable volume reflection holograms were written by inhomogeneous illumination of a prepolymer syrup containing a nematic liquid crystal and a multifunctional acrylate monomer. Switchable holograms are diffractive optics structures and the diffraction efficiency can be controlled by the application of an electric field. Reflection gratings with grating spacing varying between 0.16-0.27 µm were made during the phase separation of liquid crystals from the fast curing prepolymer syrup. The reflection efficiency of the holograms were electrically modulated with the applied field of ∼10-15V/µm. Real time study of the grating formation revealed that the maximum efficiency is reached in ∼15 seconds. The shrinkage of the host polymer during grating formation resulted in the blue shift of the reflection notch. The response time of the grating in an electric field is ∼50 µs. Low voltage scanning electron microscope studies showed the presence of discrete nematic droplet domains of sizes 30-60 nm in liquid crystal rich region.

Sign in / Sign up

Export Citation Format

Share Document