Abstract: A series of copolyesterspoly(butylene terephthalatecobutylene itaconate) (PBTI) were synthesized by melt polycondensation from dimethyl itaconate(DI), 1,4butanediol(BD) and dimethyl terephthalate (DMT). On this basis, hydrophilic diol( PEG) was selected as comonomer component to react with DI，DMI and BD via direct melt polycondensation. A series of degradable aliphaticaromatic copolyesters (PBTIG) with different PEG molecular weight and content were synthesized. Hydrolytic degradation results demonstrated that with the increase of the itaconic acid content, the degradation rate was speeded up, andthe hydrophilic PEG significantly increased the degradation rate of the copolyesters. The hydrolysis experiments showed that after 160 h, the residual of the PBTI was 91.35%, while, the residual amount is only 81.20% after adding hydrophilic PEG. The degradation rate was increased by 117.34% than PBTI.

Key words: Dimethyitaconate,    ,  Dimethyl terephthalate,    ,  Polyethylene glycol,    ,  Degradation property

摘要： 在衣康酸二甲酯( D I ) 、 对苯二甲酸二甲酯( DMT) 、 1, 4 - 丁二醇( B DO) 共聚反应生成聚( 对苯二甲酸丁 二醇酯 - c o - 衣康酸丁二醇酯)( P B T I ) 的基础上, 加入亲水性的聚乙二醇( P E G) , 合成了一系列不同相对分子质量的 可降解脂肪族 - 芳香族共聚酯—聚对苯二甲酸 - c o - 衣康酸丁二醇聚乙二醇酯( P B T I G) 。对共聚酯的降解性能进行测 试。结果表明, 改性前共聚酯的降解速率随着共聚酯链中衣康酸含量的增加而加快, 并且随相对分子质量的升高而 降低。水解实验表明, 1 6 0h后, P B T I残余量为9 1. 3 5%, 加入亲水性的P E G改性后, 共聚酯的残余量仅为8 1. 2 0%, 降解速率比P B T I提高了1 1 7. 3 4%。

关键词: 衣康酸二甲酯, 对苯二甲酸二甲酯, 聚乙二醇, 降解性能