可生物降解聚酯P(ES-co-DGA)和P(BS-co-DGA)的合成及性能比较

Synthesis and Performance Comparison of Biodegradable Polyesters of P(ES-co-DGA) and P(BS-co-DGA)

通过改变二乙醇酸(DGA)的含量,将其与乙二醇、1,4-丁二醇进行缩聚反应,得到了P(ES-co-DGA)和P(BS-co-DGA)共聚物,采用1H-NMR表征化学结构,并对共聚物的相对分子质量(Mn)、热性能、力学性能、降解性等进行比较研究。结果表明:随着DGA的增加,两种共聚物的熔点(Tm)均呈下降趋势,但P(ES-co-DGA)的玻璃化转变温度(Tg)逐渐升高,P(BS-co-DGA)的Tg却变化不大;所有共聚物的热分解温度(Td)(失重2%)均在300℃左右。当DGA含量为50%时,P(BS-co-DGA)的最大断裂伸长率可达到921%;当DGA含量为20%时,P(ES-co-DGA)的最大断裂伸长率可达到853%。随着DGA的增加,P(BS-co-DGA)的降解速率增大;当DGA含量为10%以上时,P(BS-co-DGA)的降解性能逐渐降低。

The binary copolymers of P（ES-co-DGA） and P（BS-co-DGA） were synthesized by taking different contents of glycolic acid（DGA） through polycondensation with ethylene glycol and 1,4-butanediol.Chemical structures of the copolymers were characterized by 1H-NMR,and molecular weight,thermal properties,mechanical performance and degradations were also investigated and compared.The results show that with the increasing of DGA,the melting points（Tm） of these two copolymers decrease;the glass transition temperature（Tg）of P（ES-co-DGA） gradually increases,while T g of P（BS-co-DGA） slightly changes;the thermal decomposition temperature（Td）（2% weight loss） of the two copolymers are about 300℃.When the content of DGA is 50%,the maximum elongation at break of P（BS-co-DGA） is up to 921%,while the content of DGA is 20%,the maximum breaking elongation length is up to 853%.With the increasing of DGA,the degradation of P（ES-co-DGA） increases;when the content of DGA is above 10%,the degradability of P（BS-co-DGA） decreases gradually.