Polylactic acid (PLA) is one of the most promising shape memory polymers with outstanding biocompatibility, while poly(ether ether ketone) (PEEK) is a special engineering plastic with excellent mechanical performance. In this work, PEEK was selected to modify PLA, and a series of PLA blended with different PEEK contents (PLA/PEEK blends) were obtained. The effects of PEEK on thermodynamic, mechanical and shape memory properties of PLA/PEEK blends were investigated. The results showed that the thermal stability of the PLA/PEEK blend was improved with the PEEK content increase. The tensile strength reached the highest value of 20.6 MPa when the PEEK content was 10%. While the best shape memory performance occurred with the PEEK content of 15%, the shape recovery time was less than 2 s, and the shape fixation/recovery ratio was more than 99%. Furthermore, the programmable mimetic flower opening process was achieved by using PLA/PEEK blends with different PEEK content ratios. The above results indicated that the blend of an appropriate proportion of PEEK had positive effects on mechanical and deformation performances of PLA.

聚乳酸（PLA）是最有前途的形状记忆聚合物之一，具有出色的生物相容性，而聚醚醚酮（PEEK）是一种具有优异机械性能的特殊工程塑料。在这项工作中，选择PEEK来改性PLA，并获得了一系列混合了不同PEEK含量的PLA（PLA / PEEK混合物）。研究了PEEK对PLA / PEEK共混物的热力学，机械和形状记忆性能的影响。结果表明，随着PEEK含量的增加，PLA / PEEK共混物的热稳定性得到改善。当PEEK含量为10％时，拉伸强度达到最高值20.6MPa。当PEEK含量为15％时，形状记忆性能最佳，而形状恢复时间小于2 s，形状固定/恢复率大于99％。此外，通过使用具有不同PEEK含量比的PLA / PEEK共混物，实现了可编程的模拟花朵开放过程。上述结果表明，适当比例的PEEK的共混物对PLA的力学性能和变形性能具有积极的影响。