화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.473, 15-22, 2007
Mesomorphic properties of some liquid crystals with semifluorocarbon chains
Three series of chiral compounds with semifluorocarbon chains have been synthesized. These compounds were characterized by infra-red spectra (IR), H-1 nuclear magnetic resonance (H-1 NMR), F-19 nuclear magnetic resonance (F-19 NMR), mass spectra (MS), and elemental analysis. Their phase-transition behavior was investigated by differential scanning calorimeter (DSC) and polarizing optical microscopy. To a certain compound, when the terminal hydrogen atom in the semi-fluoroalkyl chain was substituted by a chlorine atom, both the clearing point and the melting point were increased and the thermal stability of the SmC phase was enhanced. Moreover, with the introduction of a triple bond in the core, both the melting point and the clearing point were increased.