聚(丁二酸丁二醇酯癸二酸丁二醇酯)的合成与表征

用熔融缩聚法合成了一系列聚(丁二酸丁二醇酯癸二酸丁二醇酯)的无规共聚物(PBSu-co-PBSe)。通过核磁共振(1H-NMR),差示扫描量热(DSC),热重分析(TGA),X射线衍射(XRD)和酶降解测试等方法表征了材料的结构与性能。XRD测试结果表明,共聚酯的晶体结构随着癸二酸含量的增加发生了改变,并产生了共结晶行为;DSC分析得出,随着PBSe组分在共聚酯中含量的增大,产物的熔点(Tm)由84.8℃降低至46.7℃,然后升高至55.9℃,玻璃化温度(Tg)单调降低至-58.7℃;TGA分析表明,癸二酸的引入提高了聚酯的热稳定性;酶降解测试得出产物具有良好的生物降解性,当PBSe占共聚酯含量的40%时,产物具有最快的降解速率。

Synthesis and Characterization of Poly(Butylene Succinate-co-Butylene Sebacate)

A series of poly(butylene succinate-co-butylene sebacate)(PBSu-co-PBSe) random copolyesters were synthesized by polycondensation reaction.The structure and physical properties of the resulting aliphatic polyesters were characterized by hydrogen nuclear magnetic resonance spectrum(1H-NMR),X-ray diffraction(XRD),differential scanning calorimetry(DSC),thermogravimetry analysis(TGA) and lipase enzymatic degradation test.XRD patterns show that the crystal structure of copolyesters changes with the increasing of PBSe component and the cocrystallization behavior has appeared;DSC test shows that the melting point(Tm) of the product decreases from 84.8 ℃ to 46.7 ℃,and then increases to 55.9 ℃,the glass transition temperature(Tg) decreases monotonously to -58.7 ℃;TGA analysis indicates that copolymers have better thermal stability with the increasing content of sebacic acid;The lipase enzymatic degradation test indicates that the copolyester has better degradability,when the content of PBSe reaches 40mol%,the copolyester has the fastest degradative rate.