Highly Recyclable, Mechanically Isotropic and Healable 3D-Printed Elastomers via Polyurea Vitrimers,ACS Materials Letters

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Highly Recyclable, Mechanically Isotropic and Healable 3D-Printed Elastomers via Polyurea Vitrimers
ACS Materials Letters ( IF 9.6 ) Pub Date : 2021-06-30 , DOI: 10.1021/acsmaterialslett.1c00132
Wei Niu ₁ , Zhen Zhang ₂ , Qiyi Chen ₃ , Peng-Fei Cao ₂ , Rigoberto C. Advincula _{1,

3}

Affiliation

Delamination of three-dimensional (3D) printed polymer materials by fused deposition modeling (FDM) is a long-standing challenge in additive manufacturing (AM). With numerous efforts devoted to modification of commercially available thermoplastic FDM filaments, developing printing polymeric materials with new chemical design that could intrinsically improve interlayer adhesion, especially combined with other benefits, is in high demand. Herein, we developed a polyurea vitrimer with heat-driven malleability, which is printed to different 3D geometries using FDM. Significantly improved interlayer adhesion was observed by post-annealing the printed samples close to its topology-freezing transition temperature upon which fast associative dynamic covalent bonds exchange reaction occurs. Isotropic mechanical properties were achieved as demonstrated with printed tensile samples with different infill directions. The printed materials could be fully recycled for five generations with retained mechanical properties. Furthermore, the mechanical performance of the printed sample could also be repaired after damage.

中文翻译：

通过聚脲玻璃体制成的高度可回收、机械各向同性和可修复的 3D 打印弹性体

通过熔融沉积建模 (FDM) 对三维 (3D) 打印聚合物材料进行分层是增材制造 (AM) 中长期存在的挑战。随着大量致力于改进市售热塑性 FDM 长丝的努力，开发具有新化学设计的印刷聚合物材料的需求量很大，这些材料可以从本质上提高层间粘合力，特别是与其他好处相结合。在此，我们开发了一种具有热驱动延展性的聚脲玻璃体，使用 FDM 将其打印到不同的 3D 几何形状。通过在接近其拓扑冻结转变温度的温度下对印刷样品进行后退火，观察到显着改善的层间粘附力，在该温度下发生快速缔合动态共价键交换反应。如具有不同填充方向的印刷拉伸样品所证明的那样，实现了各向同性的机械性能。印刷材料可以完全回收利用五代，并保持机械性能。此外，打印样品的机械性能也可以在损坏后进行修复。

更新日期：2021-08-02

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