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Details van artikel 20 van 131 gevonden artikelen
| Titel: |
Complex formation in mixtures of 4,4'-disubstituted diphenyldiacetylenes with cyanobiphenyls |
| Auteur: |
Neubert, M. E. Keast, S. S. Humeniuk, E. E. Walsh, M. E. Petschek, R. G. |
| Verschenen in: |
Liquid crystals |
| Paginering: | Jaargang 26 (1999) nr. 11 pagina's 1695-1706 |
| Jaar: |
1999-11-01 |
| Inhoud: |
We investigated 1 : 1 mixtures of a variety of 4,4'-disubstituted diphenyldiacetylenes (PTTP series) and cyano-containing mesogens for possible complex formation. Complexes were formed when alkyl/alkoxy cyanobiphenyls (CB series) were mixed with alkyl/alkoxy PTTP homologues. We found complexes having a melting temperature higher than that for either component, and complexes with lower melting temperatures. A fluoro substituent on the PTTP gave an enhanced nematic phase and a cyclohexane ring in place of a benzene ring yielded an enhanced smectic A phase, but a cyano on the PTTP gave poor liquid crystalline properties. Phase diagrams were constructed for PTTP-2415-CB and PTTP-24180-CB mixtures. Both complexes formed had melting temperatures higher than those f o ~eit her component. These complexes were recrystallized and shown by X-ray studies to be 1: 1 complexes. The PTTP-2415-CB complex showed only a monotropic nematic phase, but the PTTP-24180-CB complex showed induced smectic A and hexatic B phases in addition to an enantiotropic nematic phase. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 20 van 131 gevonden artikelen
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