4，4＇－二苯醚二甲酸改性PET的合成与表征

SYNTHESIS AND CHARACTERIZATION OF POLY (ETHYLENE TEREPHTHALATE) MODIFTED WITH 4,4'-OXYBIS(BENZOIC ACID)

４，４＇－二苯醚二甲酸（ＯＢＢＡ）是一种重要的液晶聚合物单体。以此作为改性组分，合成了一系列ＰＥＴ共聚酯，并用１Ｈ－ＮＭＲ、ＦＴ－ＩＲ、ＧＰＣ、二甘醇和端羧基测定等方法进行了表征，同时对改性单体的转化率和合成共聚酯的反应速率进行了测定，结果表明，所选择的合成方法可以获得较高的转化率；反应速率则随ＯＢＢＡ的增加而增大。

A series of copolyesters were synthesized by reaction of ester exchange and polycondensation with dimethyl terephthalate (DMT),dimethyl 4,4’-oxybisbenzoate (DMOBB) and ethylene glycol (EG) and characterized by using 1H-NMR, FT-lR, GPC and DEG end carboxyl group analysis methods.The conversion of modifying monomer and reaction rate of ester exchange and polycondensation were investigated. The results showed that a higher conversion was obtained and the reaction rate increased with amount of DMOBB.