A wholly aromatic copolyester having repeating units of the formula: 
wherein Ar1 is 
wherein Q is selected from the group consisting of —H, —CH3, —CF3, —Cl, —Br, and —C6H5;
wherein Ar2 is selected from the group consisting of 
wherein X is selected from the group consisting of —Br, —Cl, —CH3 and —C6H5;
wherein Ar3 is 
wherein Ar4 is selected from the group consisting of 
wherein m has a value of 0.05 to 0.95 and n has a value of 100-m, is characterized by accessible nematic-isotropic transition temperatures providing outstanding orientational order and mechanical properties.
                            一种完全芳香族共聚酯,其重复单元的
化学式为:其中Ar1为其中Q从以下组中选择:—H,—
CH3,—
CF3,—Cl,—Br和—
C6H5;其中Ar2从以下组中选择:其中X从以下组中选择:—Br,—Cl,—   和—    ;其中Ar3为其中Ar4从以下组中选择:其中m的值为0.05至0.95,n的值为100-m,其特征在于具有可达到向列相-同质相转变温度,提供出色的定向有序性和机械性能。