Authors: Md. Rezaul Karim Sheikh, Masatoshi Tokita and Junji Watanabe
We synthesized a new polymerizable liquid crystal (LC) monomer, which contain naphthalene ring in the mesogen. The new LC monomer was characterized by 1H NMR, Polarized Optical Microscope (POM), Differential Scanning Calorimeter (DSC) and Wide Angle X-ray Diffractometer (WAXD) measurements. Living Atom Transfer Radical Polymerization (ATPR) was used to synthesize side chain liquid crystalline polymers (SCLCPs) of different molecular weight. The SCLCPs were characterized by 1H NMR, Gel Permeation Chromatogram (GPC), POM, DSC and WAXD. The SCLCPs showed isotropization at 179 °C, a very wide range nematic phage appeared from177-117 °C temperature region and smetic A phage appeared at or below 117°C. The glass transition temperature (Tg) was increased with the increase of molecular weight (Mn) of SCLCPs.
Keywords: LC Monomer; ATRP; Novel SCLCPs; Wide temperature rage nematic phage and Smetic A phage