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Bent-rod liquid crystal dimers: synthesis and mesomorphic properties
Sebastian Ugarteche, Nerea; Gimeno, Nelida; Vergara, Jorge; López Pérez, David Orencio; Serrano, Jose Luis; Folcia, Cesar; de la Fuente, M.R.; Ros, M. Blanca
Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. GRPFM - Grup de Recerca en Propietats Físiques dels Materials
The synthesis and characterization of three bent-rod dimers are reported. Very long flexible spacers that include methylene units and either a phenyl ring or a triazole moiety as connecting structures join the bent-and rod-promesogenic cores. Polarizing microscopy, modulated differential scanning calorimetry, X-ray diffraction at variable temperature and dielectric measurements have been performed to establish the mesophase behaviour of the dimers. The results show a complex supramolecular organization for this kind of flexible dimer in the mesophase. Interestingly, the length and the chemical nature of the flexible linking spacers condition the liquid crystalline properties of these novel compounds. Additionally, it has been found that the chemical structure of the rod-like core plays a key role in determining the kind of mesophase, either nematic or lamellar, formed by these materials.
Àrees temàtiques de la UPC::Enginyeria química
Àrees temàtiques de la UPC::Enginyeria dels materials::Materials plàstics i polímers
X-rays - Diffraction
Raigs X--Difracció
Attribution-NonCommercial-NoDerivs 3.0 Spain
Royal Society of Chemistry

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