X-Ray Diffraction Study of Thermotropic Liquid Crystalline Polyesters and Diester Model Compounds.
Abstract
Two nematic liquid crystalline polyesters were examined by x ray diffraction following quenching from the nematic temperature in a magnetic field of 15 tesla. It was not possible to quench an aligned nematic glass; instead a polycrystalline phase showing some preferred orientation or an unoriented nematic melts yielded monodomain nematic diffraction patterns with one resembling that of a fiber (crystalline) photograph while the other showed good nematic alignment which could be enhanced slightly by annealing. A series of Siamese-twin diester model compounds also were examined at their respective nematic temperatures in a magnetic field of compounds also were examined a their crystalline phase at room temperature. All displayed well-aligned nematic monodomains above the crystallization point. Keywords: X ray diffraction, Thermotropic liquid crystalline polyesters.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1987
- Accession Number
- ADA186788
Entities
People
- A. C. Griffin
- H. H. Chin
- L. V. Azaroff
Organizations
- University of Connecticut