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Nordendorf, Gaby: Effects of monomer composition on the electro-optic performance of polymer-stabilized blue phase liquid crystals. 2015
Inhalt
List of Figures
List of Abbreviations
Introduction
Background
Some liquid crystalline phases and their optical properties
Blue phases: distinguished mesophases
Optical properties of N, N^(*) and BP
Electric field effects
Electro-optic Kerr effect
Electrostriction
Field-induced phase transitions
Liquid crystal displays
TN mode
VA mode
IPS mode
Cell design for blue phases
Polymerization
Initiation
Chain growth
Termination
Stabilization of the blue phase
Polymer-stabilized blue phase
Optimizing the electro-optic performance of PSBP
Experiments
Materials
Nematic liquid crystal
Chiral dopant
Monomers
Photo-initiator
Test cells
Sample preparation
Mixture preparation and processing
Preparation of test cells
Electro-optic measurements
Measurement of Bragg reflections
Static measurements
Dynamic measurements
Photo-DSC
Equipment and Experiment
Analysis of the photo-DSC data
Results and Discussion
Differences between unpolymerized and polymerized samples
Phase sequences of BP and PSBP mixtures
Anomalies affecting the Kerr measurement
Switching processes with different speed
Stability of polymer-stabilized blue phase
Influence of different parameters on the electro-optic performance
Chirality
Total monomer content
Cross-linker fraction
Different kinds of cross-linkers
Polymerization temperature
UV exposure time
Conclusions and Outlook
Appendix
Sample compositions
BP mixtures without monomers
PSBP mixtures with monomers
PSBP mixtures for the test series with varying sample composition
Mixture without monomers for test series with varying sample composition
Phase sequence and polymerization temperature of the mixtures
Individual mixtures
Mixtures for test series with monomer
Mixture for test series without monomers
Cells to test preparation conditions
Contributions in peer-reviewed journals
Conference contributions
Oral presentations
Poster presentations
Bibliography
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