The shape of 3D printed products can be transformed over time, achieving 4D printing. In this work, poly(lactic acid) (PLA)/poly(ε‐caprolactone) (PCL) blends are fabricated via fused deposition modeling (FDM). The thermoresponsive shape memory effects (SMEs) of 3D printed blends are investigated by stress‐controlled dynamic mechanical analysis in tension mode. The SME mechanism is clarified in detail, along with the crystallization and melting behaviors, dynamic mechanical properties, and morphologies of PLA/PCL blends. It is confirmed that the crystallinity of reversible phase PCL, the glass transition behavior of fixed phase PLA and the two‐phase interfaces have important effects on the shape memory performance. Furthermore, the SME can be tuned by optimizing printing parameters. The 3D printed product fabricated with raster angle of 45°/−45°, infill density of 80%, and layer thickness of 0.05 mm exhibits a favorable SME at the deformation temperature of 65 °C. Shape memory products fabricated via FDM technology have great application potential for 4D printing.

中文翻译：

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熔融沉积建模制备的3D打印聚乳酸/聚己内酯共混物的良好热响应形状记忆效应

3D打印产品的形状可以随时间变化，从而实现4D打印。在这项工作中，通过熔融沉积建模（FDM）制备了聚乳酸（PLA）/聚ε-己内酯（PCL）共混物。通过在张力模式下进行应力控制的动态力学分析，研究了3D打印共混物的热响应形状记忆效应（SMEs）。详细阐明了SME机理，以及PLA / PCL共混物的结晶和熔融行为，动态力学性能和形态。证实了可逆相PCL的结晶度，固定相PLA的玻璃化转变行为以及两相界面对形状记忆性能具有重要影响。此外，可以通过优化打印参数来调整SME。光栅角度为45°/ -45°的3D打印产品 填充密度为80％，层厚度为0.05 mm，在65°C的变形温度下表现出良好的SME值。通过FDM技术制造的形状记忆产品在4D打印方面具有巨大的应用潜力。