Maintaining the high mechanical properties of degradable polyesters is crucial for their practical application. In this work, tricyclodecanedimethanol (TCD) with a rigid ring structure was introduced into the synthesis of polybutylene succinate (PBS) to form PBTCDS copolyester. The addition of TCD significantly improved the glass transition temperature (T_g), mechanical properties, and barrier properties of the copolyester. The inherent toughness of PBS is limited by its poor elongation at break, which restricts its application range. However, the tensile strength of PBTCDS5 synthesized in this study is 42 MPa, with an elongation at break of 687%. It is noteworthy that the elongation at break of PBTCDS15 reaches 860%, greatly improving the mechanical properties of PBS. Compared with PBS (T_g −31.4 °C), the T_g of the copolyester increased from −29.2 °C to −22.8 °C, thereby improving its thermal properties. The water vapor barrier test showed that the water vapor transmission rate had improved. In addition, water degradation experiments showed that changing the TCD content resulted in different degradation rates, leading to copolyesters with different degradation rates. Ultimately, this method significantly improves mechanical properties while maintaining degradability, thereby broadening the application scope of PBS.

中文翻译：

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通过聚丁二酸丁二酯的共聚改性合成具有高分子量和优异机械性能的可降解聚酯


保持可降解聚酯的高机械性能对于其实际应用至关重要。在本工作中，将具有刚性环结构的三环十二烷二甲醇 （TCD） 引入聚丁二酸丁二酯 （PBS） 的合成中，形成 PBTCDS 共聚酯。TCD 的添加显着改善了共聚酯的玻璃化转变温度 （T_g）、机械性能和阻隔性能。PBS 的固有韧性受到其较差的断裂伸长率的限制，这限制了其应用范围。然而，本研究中合成的PBTCDS5的拉伸强度为 42 MPa，断裂伸长率为 687%。值得注意的是，PBTCDS15的断裂伸长率达到 860%，大大提高了 PBS 的力学性能。与 PBS （T_g -31.4 °C） 相比，共聚酯的 T_g 从 -29.2 °C 增加到 -22.8 °C，从而改善了其热性能。水蒸气阻隔性试验表明，水蒸气透过率有所提高。此外，水降解实验表明，改变 TCD 含量会导致不同的降解速率，从而导致共聚酯具有不同的降解速率。最终，该方法在保持可降解性的同时显着改善了机械性能，从而拓宽了 PBS 的应用范围。