Nematic and smectic liquid crystalline polymers were prepared from 4.4'-dihydroxybiphenyl and dibasic acids having 7 and 8 methylene units. A series of blends were also obtained from the two types of polymers mentioned above.
The mesophases formed at elevated temperature were studied by differential scanning calorimetry and polvrized optical microscope. Complex phase diagrams were observed about predominant nematic or smectic phases with the change of weight fractions of the two homogeneous liquid crystalline polymers.
The thermal and mechanical properties of blends of polycarbonate and the nematic liquid crystalline polymers were also studied.