Study on a series of main-chain liquid-crystalline ionomers containing sulfonate groups

摘要: A series of main-chain Liquid-crystalline ionomers containing sulfonate groups pendant on the polymer backbone were synthesized by an interfacial condensation reaction 4,4'-dihydroxy-alpha,alpha'-dimethyl benzalazine, a mesogenic monomer, with brilliant yellow (BY), sulfonate-containing and 1/9 mixture terephthaloyl sebacoyl dichloride. The structures polymers characterized LR UV spectroscopies. DSC thermogravimetric analysis used to measure thermal properties those polymers, polarized optical microscope, DSC, wide-angle X-ray diffraction. thermally stable about 310 degreesC. They thermotropic liquid-crystalline (LCPs) high mesomorphic-phase transition temperatures exhibited broad nematic regions 160-170 degreesC, they lyotropic LCPs willowy leaf-shaped textures in sulfuric acid. However, somewhat weakened because concentration BY was more than 8%. inherent viscosity N-methyl-2-pyrrolidone suggested that intramolecular associations occurred at low concentration, intermolecular predominated higher concentration. (C) 2001 John Wiley & Sons, Inc.