Abstract
Temperatures and enthalpy changes are reported for the melting, clearing, and nematic-to-solid transition of the p-cyanophenyl p-(n-alkyl)benzoate (RCBz) liquid crystals. The results reveal that several solid structures exist for the RCBzs. Evidence that the transitions between the various solid forms involve conformational changes is provided by exotherms and endotherms appearing in heating and cooling cycles, respectively. The study also demonstrates that as long as melted RCBzs are not allowed to solidify they undergo repeated, reversible nematic-to-isotropic and isotropic-to-nematic transitions making them suitable for use in liquid crystal displays (LCD).
| Original language | English |
|---|---|
| Pages (from-to) | 111-118 |
| Number of pages | 8 |
| Journal | Thermochimica Acta |
| Volume | 325 |
| Issue number | 2 |
| DOIs | |
| State | Published - 18 Jan 1999 |
Bibliographical note
Funding Information:We thank King Fahd University of Petroleum and Minerals (KFUPM) for support of this work. We also express our thanks to Dr. H. Hamid, the manager of the Petroleum Refining and Petrochemicals Section at the KFUPM Research Institute (RI), for facilitating our use of the DSC-4 unit. We also thank Mr. M. Saleem and Mr. I.A. Ismail for technical and experimental assistance.
Keywords
- Conformations
- Enthalpies
- Liquid crystals
- Phase transitions
- Polymorphism
ASJC Scopus subject areas
- Instrumentation
- Condensed Matter Physics
- Physical and Theoretical Chemistry