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作为酶促降解的新基质,采用环状三亚甲基碳酸酯(TMC)开环参与PBS共聚,得到了PBS分子主链中含有碳酸酯基的PBS基共聚酯P(BS-co-TMC)。采用1H-NMR表征了新型共聚物的化学结构,并对共聚物的结晶性能、热性能和力学性能进行了研究。结果表明:1H-NMR证明了得到的产物是预期的P(BS-co-TMC);WXRD表明其晶型结构和PBS相似,但随着TMC含量的添加,晶体尺寸稍有增大,结晶度降低,θg和θd都有所降低;但θd-5%仍在300℃以上,说明仍具有良好的热稳定性;共聚物的断裂伸长率明显提高,柔顺性增加。相比PBS,南极假丝酵母脂肪酶N435对P(BS-co-TMC)的降解作用明显增强,对于改善PBS的降解性具有一定的意义。
As a new substrate for enzymatic degradation, cyclic copolymerization of PBS-based copolyester P (BS-co-TMC) with carbonate groups in the main chain of PBS was obtained by ring-opening polymerization of cyclic trimethylene carbonate (TMC) . The chemical structure of the novel copolymer was characterized by 1H-NMR and the crystallization, thermal and mechanical properties of the copolymer were studied. The results showed that the product was expected to be P (BS-co-TMC) by 1H-NMR. The crystal structure of WXRD was similar to that of PBS. However, with the addition of TMC, the crystal size increased slightly, Decreased, θg and θd decreased; but θd-5% is still above 300 ℃, indicating that there is still good thermal stability; elongation at break of the copolymer significantly increased, increased flexibility. Compared with PBS, the degradation of P (BS-co-TMC) by Candida antartica lipase N435 was significantly enhanced, which is of great significance for improving the degradability of PBS.