Abstract: A series of biodegradable poly(butylene succinate-co-1,2-propylene succinate)s [P(BS-co-PS)] were synthesized by solution polycondensation combined with melt polycondensation from succinic acid with 1,4-butanediol and 1,2-propanediol. The chemical structures of the products were characterized by1H NMR. The characters of the polymers，such as relative molecular weight，molecular weight distribution，crystallinity，thermal properties and mechanical properties，were characterized. P(BS-co-PS) copolymers with molecular weight (Mn) higher than 60000 and molecular weight distribution less than 2.0 were obtained in a reaction time of 4h. With the increase of 1,2-propanediol content，the copolymer has a decrease in crystallinity and Tm and an increase in elongation at break. When the molar content of 1,2-propanediol is 30%，the polymer has an elongation at break as high as 417%. The decomposition temperature of the obtained copolymers is all above 300 ℃.

摘要： 以丁二酸、丁二醇和1,2-丙二醇为原料，采用溶液结合熔融缩聚合成法，得到了一系列聚（丁二酸丁二醇酯-co-丁二酸1,2-丙二醇酯）共聚物P（BS-co-PS）。利用1H NMR、GPC和X射线衍射等方法对共聚物的组成、分子量及其分子量分布、热学性能、结晶性能、力学性能等进行了研究。结果表明：反应4 h，即可得到数均分子量60 000以上的聚（丁二酸丁二醇酯-co-丁二酸1,2-丙二醇酯）共聚物P（BS-co-PS），分子量分布均小于2.0；随着1,2-丙二醇添加量的增加，共聚物的结晶度降低，熔点下降，但断裂伸长率明显增加，当添加量为30%（摩尔分数）时，断裂伸长率达到417%，表明共聚物具有良好的延展性能；所有共聚物的热分解温度均在300 ℃以上，具有良好的热稳定性。