自愈合材料实现自支撑各向同性3D打印

Self-healing materials enable free-standing seamless large-scale 3D printing

3D打印已经在诸多领域产生了重要影响,其中熔融沉积成型(fused deposition modeling,FDM)是最通用和最经济的3D打印技术.然而,FDM通常需要支撑结构,这大大增加了加工的复杂性和成本.此外,层间结合力差极大地影响了FDM 3D打印制品的机械稳定性.本文提出了一种新的打印-愈合策略来解决上述挑战.采用了三重动态键设计,研制了一种具有良好的打印性能和室温自愈能力的聚合物.利用简便紧凑型的3D打印机打印出了各种形状的物体,并通过自修复便捷地将它们组装成大型复杂的三维结构.三重动态键显著提升了打印制品层与层之间的结合力.此外,损坏的打印品可以自我修复,这大大延长了它们的使用寿命.这项工作为解决FDM 3D打印的关键瓶颈问题提供了一种简单有效的方法,有望在多个领域获得应用.

Three-dimensional(3 D)printing has had a large impact on various fields,with fused deposition modeling(FDM)being the most versatile and cost-effective 3 D printing technology.However,FDM often requires sacrificial support structures,which significantly complicates the processing and increases the cost.Furthermore,poor layer-to-layer adhesion greatly affects the mechanical stability of 3D-printed objects.Here,we present a new Print-Healing strategy to address the aforementioned challenges.A polymer ink(Cu-DOU-CPU)with synergetic triple dynamic bonds was developed to have excellent printability and room-temperature self-healing ability.Objects with various shapes were printed using a simple compact 3D printer,and readily assembled into large sophisticated architectures via self-healing.Triple dynamic bonds induce strong binding between layers.Additionally,damaged printed objects can spontaneously heal,which significantly elongates their service life.This work paves a simple and powerful way to solve the key bottlenecks in FDM 3D printing,and will have diverse applications.