Structural Rearrangements During Mesomorphic Phase Transitions in Poly(10-((4-Cyano-4' Biphenyl)oxy )Decanyl Vinyl Ether
Abstract
The side chain liquid crystalline poly 10-(4-CYANO-4'-BIPHENYL) oxydecanyl vinyl ether) exhibits two different smectic phase: at low temperature an ordered smectic E phase with orthorhombic intralayer packing of the mesogenic groups, and at high temperatures a common disordered smectic A phase. In both phases a doublelayered longitudinal packing of the macromolecular fragments with a thickness of 6.6 -7 nm and overlapping of the slightly tilted mesogenic groups is realized. During the phase transition from the smectic E to the smectic A a melting of the intralayered packing occurs which leads also to the slight changes of the thickness of the smectic layers as a result of the conformational disordering of the side chains. A smectic Alike structure could be freezed in the glassy state by quick cooling. The development of the ordered smectic E phase as a result of annealing at temperatures higher than Tg is a very slow process since it requires the formation of the ordered intralayered orthorhombic packing of mesogenic groups.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 27, 1992
- Accession Number
- ADA248306
Entities
People
- Minah Lee
- V. Tsukrut
- Virgil Percec
Organizations
- Case Western Reserve University