Liquid Crystals and Ordered Polymers for Infrared and Microwave Applications
Final rept. 1 Jun 1998-3 May 2001
OKLAHOMA UNIV NORMAN DEPT OF CHEMISTRY
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1 A large number of new liquid crystals were synthesized for possible applications in advanced electro-optic devices operating in infrared and microwave ranges. These compounds contain an electron-donating group and an electron-accepting group separated by a conjugated mesogenic core. The push-pull structure imparts a large longitudinal dipole moment on the molecule, resulting in very large dielectric anisotropy and significant birefringence extending to the infrared region. The electro-optic properties of several of these compounds dissolved in room-temperature nematic solvents have been measured. 2 Macroscopically oriented epoxy thermosets were formed by polymerizing liquid crystalline diepoxides with an aromatic diamine. They show increased mechanical strength over unoriented samples, and possess optical anisotropy. 3 Two short projects not originally planned were also carried out. The first was the production of super-strong cellulose aerogels, and the second was an NMR study of a polymer-dispersed liquid crystal PDLC system.
- Polymer Chemistry
- Electrooptical and Optoelectronic Devices