Thermoplastic polyurethane elastomers (PUEs) consisting of biodegradable poly (ε-caprolactone) (PCL) and low toxic aliphatic diisocyanates are of great potential in biomedical applications, but the inferior mechanical strength and elastic recovery at large strain have limited their practical utilization. Inspired by the outstanding thermal and mechanical properties of stereocomplex (SC) PLA, a thermoplastic PUE that contains SC crystallites (SC-PU) was prepared via racemically blending the PLA stereoisomers-based polyurethanes. The formation of SC crystallites in SC-PU was confirmed by WAXD and ATR-FTIR techniques. The effects of stereocomplexation on its thermal, morphological and mechanical properties were investigated. The results show that the SC crystalline domains, acting as ‘additional reinforcing phases’, endow the improved performance of SC-PU in tensile strength, Young's modulus, elastic recovery, and other properties. This study may provide a new method to improve the inferior mechanical properties of biodegradable PUEs based on PCL and aliphatic diisocyanates, which can contribute to the expansion of their applications in widespread fields.

由可生物降解的聚（ε-己内酯）（PCL）和低毒的脂肪族二异氰酸酯组成的热塑性聚氨酯弹性体（PUE）在生物医学应用中具有巨大潜力，但机械强度和大应变下的弹性回复率较低，限制了它们的实际应用。受立体复合物（SC）PLA出色的热和机械性能的启发，通过外消旋地混合PLA立体异构体基聚氨酯，制备了包含SC微晶（SC-PU）的热塑性PUE。WAXD和ATR-FTIR技术证实了SC-PU中SC微晶的形成。研究了立体配合物对其热学，形态学和机械性能的影响。结果表明，SC晶畴作为“附加强化相”，赋予SC-PU在拉伸强度，杨氏模量，弹性回复和其他性能方面的改进性能。这项研究可能会提供一种新方法，以改善基于PCL和脂肪族二异氰酸酯的可生物降解PUE的较差的机械性能，这可能有助于扩大其在广泛领域中的应用范围。