Liquid crystal polymer segments with hydroxyl end group PET/60PHB were synthesized by in situ acetylation method in which the PET oligomer

p hydroxy benzoic acid and a little amount of EG were used.Then the liquid crystalline block copolymers PET/60PHB b PC were prepared by using LCP segment PET/60PHB obtained as a macromonomer and ester exchange synthetic technology of PC.The liquid crystalline block copolymers were also characterized by the aids of determination of inherent viscosity

DSC

polarizing microscope

X-ray diffraction and FTIR etc..It is found that when the inherent viscosity of PET oligomer is 0.05～0.07dL/g

Ac2O/PHB(mol/mol)=1.3

EG/PET(mol/mol)=0.06

the hydroxyl terminated LCPs PET /60PHB with light colour

good solubility and liquid crystalline properties can be obtained.The liquid crystalline block copolymers with high inherent viscosity and good liquid crystalline properties can be synthesized with above LCPs as a raw material through melt copolycondensation.It is indicated that the liquid crystalline block copolymers are nermatic

but the texture of liquid crystalline state of the block copolymer is quite different from either the pure LCPs PET/60PHB or the mixture of PET/60PHB and PC.Furthermore

the analysis methof of end group of LCP PE/60HB is also established.