Synthesis and characterization of amphiphilic liquid-crystalline hydroxypropyl cellulose containing p-methoxy azobenzene

Azobenzene functionalized hydroxypropyl cellulose derivatives (azo-HPCs) with different degrees of substitution with azobenzene moieties (DSazo) were synthesized and characterized. Molecular characterization of the resulting polymers with different degrees of substitution was performed with proton nuclear magnetic resonance (1H NMR) and Fou-rier-transform infrared spectroscopy (FTIR). Thermal stability was investigated by thermogravimetric analysis (TGA). The phase transitions and liquidcrystalline behavior of these polymers were investigated by differential-scanning calorimetry (DSC) and polarized optical microscopy (POM). The results indicate that DSazo has substantial effect on the liquidcrystalline behavior of these polymers.

کلیدواژه ها:

Liquid-crystalline cellulose derivatives. Main-chain/side-chain liquid-crystalline polymer. Azo polymers ، amphiphilic copolymers