生物基聚对苯二甲酸多元醇酯的结构及性能研究

Structure and properties of bio-based polydihydricals alcohol terephthalate

以精对苯二甲酸（PTA）和生物基乙二醇（BioEG）为原料,在酯化阶段添加多元醇,采用直接酯化法合成生物基聚对苯二甲酸多元醇酯,分析了BioEG的成分,研究了生物基共聚酯的结构及性能.结果表明：PTA：BioEG摩尔比为1.0∶1.2,多元醇摩尔分数（相对PTA）为0～0.6％,合成的生物基共聚酯具有较好的热稳定性和亲水性能;多元醇参与了聚合反应,产物中存在羟基基团;相比石油基聚酯,生物基共聚酯的特性黏数略低,熔点低10 ～20℃,结晶度略有下降,起始分解温度为421 ～424℃,与水的表面接触角为75°～81°.

Bio-based polydihydricals alcohol terephthalate was synthesized by using purified terephthalic acid （PTA） and bio- based ethylene glycol （BioEG） as feedstocks and adding polyol during the esterification stage via direct esterification process. The compositions of BioEG was analyzed. The structure and properties of bio-based copolyesters were studied. The results showed that the synthesized bio-based copolyester exhibited fairly good thermal stability and hydrophilic property when the mole ratio of PTA and BioEG was 1.0 ： 1.2 and the mole fraction of polyol was 0 -0.6% based on PTA; polyol participated the polymeriza- tion reaction and some hydroxyl groups existed in the product; as compared with petroleum-based polyester, bio-based copolyester had the slightly lower intrinsic viscosity, melting point 10 -20 ℃lower, crystallinity slightly decreased, initial decomposition temperature 421 -424 ℃ and surface contact angle with water 75° -81 °