Novel side-chain liquid crystalline polyamines (SCLCPs) were synthesized by ring-opening polymerization of aziridine monomers. Their thermal and liquid crystalline properties were examined with a polarizing microscope and a differential scanning calorimeter. Aziridine monomers showed no liquid crystalline phases. SCLCPs with nitro or 2-hydroxyethyl terminal groups in the side chains exhibited a smectic A phase with a fan-shaped texture. However, SCLCP with ethylazobenzene side-groups and SCLCP with nitroazobenzene side-groups with a methyl lateral substituent did not formed a liquid crystalline phase.