Synthesis and Properties of Dendrimer Liquid Crystal Based on Ester and Ether of Gallic Acid

With gallic acid and n-butanol as main materials, a new dendrimer micromolecular compound with the skeleton of gallic acid was synthesized by reactions of esterification and etherification of gallic acid. The structure of product was detected by elemental analysis, 1H NMR, IR and MS. The target molecule has the structure of alkyl ester and phenoether. The differential scanning calorimeter (DSC) and polarizing optical microscope (POM) measurements showed the target molecular behavior of mesophase and its streak textures belong to nematic. Its temperature range of mesophase was 78 °C during heating process and 58 °C during cooling process. The results showed that dendrimer molecule can formed with the structural unit of gallic acid and it has lower melting point and behaviors of thermotropic liquid crystal.