Accession Number:

ADA394995

Title:

Liquid Crystals and Ordered Polymers for Infrared and Microwave Applications

Descriptive Note:

Final rept. 1 Jun 1998-3 May 2001

Corporate Author:

OKLAHOMA UNIV NORMAN DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

2001-05-01

Pagination or Media Count:

9.0

Abstract:

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.

Subject Categories:

  • Polymer Chemistry
  • Electrooptical and Optoelectronic Devices
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE