Ionic liquid crystalline systems with branched or hyperbranched polymers

Thermal, liquid crystalline, and orientational properties of ion complex-ty pe liquid crystalline systems with branched or hyperbranched polymers were estimated. In this research, branched polyethyleneimine (BPEI), polyallylam ine (PAA), poly (amido amine) dendrimer (DD), alkanoic acid (Cn) and an azo benzene derivative (5 Az 8) with a terminal carboxyl group were used. Polyi on complexes were prepared by the proton-transfer reaction of polyamines an d carboxylic acids. The liquid crystalline systems formed fluid smectic mes ophases. The ionic interactions lead to the formation of liquid crystalline phases and the enhancement of thermal stability. The introduction of branc hed chains decreased isotropization temperature and isotropization enthalpy of the liquid crystalline systems.