화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.461, 53-69, 2006
Effect of the polar substituents on the optical parameters of binary mixtures of 4-substituted-phenyl-4-hexyloxybenzoates
The refractive indices as a function of temperature were measured for the individual components of 4-substituted-phenyl-4-hexyloxybenzoates as well as their binary mixtures. In these components one terminal substitution is C6H13O and the other terminal is either the methoxy (CH3O), methyl (CH3), cyano (CN), or nitro (NO2) group. Refractive index data were used to estimate the molecular order parameter (S) and the length-to-breadth ratio (k) for all samples investigated. The entropy change (Dsc) at the nematic-isotropic transition temperatures (Tc) was also calculated from differential scanning calorimetry data (DSC). The results were thoroughly analyzed and compared.