Effect of molecular structure on mesomorphism XXI. Monodisperse tetrameric model compounds for liquid crystalline polymers |
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| Authors: | A C Griffin S L Sullivan W E Hughes |
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| Institution: |
a Departments of Chemistry, University of Southern Mississippi, Hattiesburg, Mississippi, U.S.A.
b Polymer Science, University of Southern Mississippi, Hattiesburg, Mississippi, U.S.A.
c Physics, University of Southern Mississippi, Hattiesburg, Mississippi, U.S.A. |
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| Abstract: | Twinned dimeric mesogens having a rigid-flexible-rigid molecular structure have been shown to be appropriate models for some properties of regularly alternating (rigid-flexible)n main chain liquid crystalline polymers (lcps). A family of tetrameric monodisperse liquid crystalline model compounds chemically related to known main chain liquid crystalline polymers of the 4-alkoxyphenyl 4'-alkoxy-benzoate type has been synthesized. The tetramers are nematogenic. Alternations in thermodynamic parameters (ΔH, ΔS) for the N-I transition as a function of spacer chain length indicate conformational behaviour of the internal spacers dominates mesophase properties. |
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