采用两种方法弟一次合成出高分于量新聚合物:聚4—羟—3—溴奉甲酸酯、聚4—羟—3.5—二溴苯甲酸酯。用同样的方法合成了已知的聚合物聚4—羟—3.5—二氯苯甲酸酯。1)卤素取代的4—三甲基甲硅氧苯甲酰氯进行溶液缩聚,产率=98～100%。,产率=98%。M_n=18000,产率=99%。2)卤素取代的4—乙酰氧苯甲酸进行溶液缩聚,此法对于在高温下(320℃)比较稳定的含氯聚酯较为适用:M_n=50000,产率= 、一, Cl/83%. Two methods were used to synthesize high molecular weight new polymers: poly 4-hydroxy-3-bromoformate and poly 4-hydroxy-3,5-dibromobenzoate. Known polymer poly 4-hydroxy-3,5-dichlorobenzoate was synthesized by the same method. 1) Halogen-substituted 4-trimethylsiloxybenzoyl chloride solution polycondensation, the yield = 98 ~ 100%. , Yield = 98%. M_n = 18000, yield = 99%. 2) solution polycondensation of halogen-substituted 4-acetoxybenzoic acid, this method is more suitable for chlorine-containing polyesters which are stable at high temperature (320 ℃): M_n = 50000, yield = 1, Cl / 83%.