Poly(butylene n-alkylenedionate)s (PBADs), which are polymers that are potentially biodegradable in various environments, exhibit excellent thermal and mechanical properties similar to those of polyethylene because of their long alkyl chains. However, although it has not yet been experimentally verified, it is known that differences in the alkyl chain length affect the biodegradability of PBADs. In this study, we synthesized PBADs with alkylene diacid units, with the number of methylene chains ranging from 11 to 14. We subsequently investigated the relationship between their biodegradability via clear-zone formation and BOD-biodegradation testing and their physical properties, including their structural characteristics, using instrumental analysis. Although the monomers 1,4-butanediol (BD) and α,ω-dicarboxylic acids (DCA) exhibited good biochemical oxygen demand (BOD)-biodegradability, PBADs did not, indicating that PBADs with 11–14 methylene chains do not readily degrade in natural environments.

聚（丁烯ñ亚烷基二酸酯 (PBAD) 是一种在各种环境中具有潜在生物降解性的聚合物，由于其长烷基链，表现出与聚乙烯相似的优异热性能和机械性能。然而，虽然尚未经过实验验证，但已知烷基链长的差异会影响 PBAD 的生物降解性。在这项研究中，我们合成了具有亚烷基二酸单元的 PBAD，亚甲基链的数量从 11 到 14。我们随后通过透明区形成和 BOD 生物降解测试研究了它们的生物降解性与它们的物理特性之间的关系，包括它们的结构特征，使用仪器分析。虽然单体 1,4-丁二醇 (BD) 和 α,