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1999
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Physicians--Ohio--Cleveland
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Keast S.S.
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Created Date = 1999
-mods_subject_topic_ms ≠ Physicians--Ohio--Cleveland
Creator = Keast S.S.
Complex formation in mixtures of 4,4′-disubstituted diphenyldiacetylenes with cyanobiphenyls
Description
We investigated 1:1 mixtures of a variety of 4,4′-disubstituted diphenyldiacetylenes (PTTP series) and cyano-containing mesogens for possible comple
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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-24/5-CB and PTTP-24/8O-CB mixtures. Both complexes formed had melting temperatures higher than those for either component. These complexes were recrystallized and shown by X-ray studies to be 1:1 complexes. The PTTP-24/5-CB complex showed only a monotropic nematic phase, but the PTTP-24/8O-CB complex showed induced smectic A and hexatic B phases in addition to an enantiotropic nematic phase. ©1999 Taylor & Francis Ltd.
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Creator
Neubert M.E.
;
Keast S.S.
;
Humeniuk E.E.
;
Walsh M.E.
;
Petschek R.G.
Permanent URL
http://hdl.handle.net/2186/ksl:petschekrolfeArt-042