This paper deals with the synthesis of mesogenic condensation monomer

2-methyl-1

4-phenylene bis(4-chloroformyl) benzoate. The liquid crystalline non-liquid-crystalline sequential block copolymers made from this mesogenic monomer and 1

10-decanediol and poly (propylene glycol) are also discussed. In the DSC thermograms of the samples with higher inherent viscosity

a marked exothermic peak is found to exist after the melting of the samples. This unusual phenomenon may have suggested an additional organization of the mole-cules in the liquid crystalline state.