Low molecular weight nematic liquid crystalline prepolymers with carboxyl end groups were prepared by reacting diacetoxybiphenyl and excess of azelaic acid. Low molecular weight smectic liquid crystalline prepolymers with acetoxy end groups were prepared by reacting excess diacetoxybiphenyl and sebacic acid.
Thermotropic liquid crystalline multi block copolyesters with nematic and smectic block segments were synthesized by reacting the nematic and smectic low molecular weight prepolymers in bulk.
The mesomorphic behaviors of the block copolymer were studied by Differential Scanning Calorimetry and polarizing microscope.
The thermal and mechanical properties of block copolyesters as well as the crystallization kinetics were analyzed.
