Abstract Poly(10-hydroxydecanoate) (PHDA) is of interest as a new-type aliphatic polyester due to its bioresource and flexible mechanical property. A series of PHDAs with varied molecular weights (Mn from 27 kg/mol to 74 kg/mol) were prepared by optimized melt polycondensation of 10-hydroxydecanoic acid (HDA). Through DSC, WAXD, POM and tensile tests, the effects of molecular weight on the physical properties, including thermal properties, crystallization behavior, crystal morphology, rheological behavior and mechanical properties of PHDA were studied in detail. The results demonstrated that the physical properties of PHDA largely rely on the molecular weight. In particular, the brittle-ductile transition of PHDA occurred when the molecular weight increased up to 55 kg/mol. With the increase of molecular weight, the elongation at break was largely improved and finally exceeded 1400%. The ultimate tensile strength kept about 20 MPa. Hence, PHDA has a PE-like mechanical property. Our work highlights that PHDA is a polymer with excellent performance, which provides an alternative to durable petroleum resourced packaging materials.

中文翻译：

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衍生自 10-羟基癸酸的生物基脂肪族聚酯：物理性质的分子量依赖性

摘要 聚(10-羟基癸酸酯) (PHDA) 作为一种新型脂肪族聚酯，由于其生物资源和柔性机械性能而备受关注。通过优化 10-羟基癸酸 (HDA) 的熔融缩聚反应制备了一系列不同分子量 (Mn 从 27 kg/mol 到 74 kg/mol) 的 PHDA。通过DSC、WAXD、POM和拉伸试验，详细研究了分子量对PHDA物理性能的影响，包括热性能、结晶行为、晶体形貌、流变行为和力学性能。结果表明，PHDA 的物理性质在很大程度上取决于分子量。特别是，当分子量增加到 55 kg/mol 时，PHDA 发生脆-韧转变。随着分子量的增加，断裂伸长率大大提高，最终超过1400%。极限抗拉强度保持在20 MPa左右。因此，PHDA 具有类似 PE 的机械性能。我们的工作强调了 PHDA 是一种具有优异性能的聚合物，它为耐用的石油资源包装材料提供了替代品。