线性PBS基脂肪族聚酯的合成和降解研究

为了探讨线性PBS基脂肪族共聚酯的结构和降解之间的关系,首先合成了线性PBS基脂肪族共聚酯,即聚丁二酸丁二醇酯-共-聚己二酸丁二醇酯P(BS-co-BA),聚丁二酸丁二醇酯-共-癸二酸丁二醇酯P(BS-co-BSe),并将线性PBS基脂肪族共聚酯及PBS在土壤悬浮液中进行降解,通过GPC、熔点测定仪对线性PBS基脂肪族共聚酯的分子量和熔点进行了测定;通过测定降解过程中失重率和降解前后聚酯薄膜表面形貌来对共聚酯降解程度进行表征。结果表明:随着二元酸碳链的增长,分子对称性降低,降解性能增大。通过观察分子量,熔点及降解失重率的测定结果,得出分子量越大,降解越不容易进行;熔点越小,降解性能越好。

Study on the Synthesis and Degradation of Lineatity PBS-based Polyesters

A series of biodegradable Poly(butylene succinate-co-1,2-propanediol succinates)(P(BS-co-1,2-PS))and Poly(butylene succinate)(PBS)was synthesized and degraded under soil suspension.The molecular weight and melting point of products was characterized by GPA and melting point detector.The experimental results were characterized by surface morphology.The outcome showed that the degradation property increased and the molecular symmetry reduced with the growing of dual carbon chain.The results of molecular weight,melting point and degradation loss ratio indicated that the polymers degraded difficult with the high molecular weight and a better degradation with a lower melting point.