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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。
Poly (D-co-DGA) and P (BS-co-DGA) copolymers were obtained by polycondensation of ethylene glycol and 1,4-butanediol by changing the content of DGA. The chemical structure was characterized by1H-NMR. The relative molecular mass (Mn), thermal properties, mechanical properties and degradability of the copolymers were also compared. The results showed that the melting point (Tm) of both copolymers decreased with the increase of DGA, but the glass transition temperature (Tg) of P (ES-co-DGA) DGA) has little change in Tg; the thermal decomposition temperature (Td) (weight loss 2%) of all copolymers is about 300 ℃. When the content of DGA is 50%, the maximum elongation at break of P (BS-co-DGA) can reach 921%. The maximum elongation at break of P (ES-co-DGA) Reached 853%. With the increase of DGA, the degradation rate of P (BS-co-DGA) increased. When the content of DGA was more than 10%, the degradability of P (BS-co-DGA) decreased gradually.