Chiral Liquid Crystalline Ionomers Containing Sulfonic Acid Groups and Isosorbide

摘要

In order to explore the effect of ionic groups on the properties of the liquid-crystalline polymers, a series of new main-chain liquid-crystal ionomers (LCIs) were prepared from sebacoyl chloride (SD), brilliant yellow (BY) and various amount of 4, 4' -Dihydroxy-2, 2' -dimethyl Benzalazine (DDBA) and isosorbide (ISO). The structures of the polymers were characterized by FT-IR and UV spectroscopies. Differential scanning calorimetry (DSC) was used to measure the thermal properties of the polymers. The mesogenic properties were investigated by polarized optical microscope (POM), differential scanning calorimetry and X-ray diffraction measurements. The results show that the LCIs are chiral smectic C (SC*) and nematic (N) LCIs exhibiting broken focal-conic texture and schlieren texture. The introduction of ionic units in the LCIs led to the clearing point and mesogenic temperature range increasing and the glass-temperature decreasing, but did not affect the mesogenic type and texture, as compared with the corresponding polymer P_0.