双固化聚氨酯弹性体的空间控制 3D 打印,Advanced Materials Technologies

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双固化聚氨酯弹性体的空间控制 3D 打印
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2021-10-10 , DOI: 10.1002/admt.202100700
Brian M. Howell _{1,

2} , Caitlyn C. Cook ₁ , Michael D. Grapes ₁ , Karen Dubbin ₁ , Emily L. Robertson ₁ , John D. Sain ₁ , Kyle T. Sullivan ₁ , Eric B. Duoss ₁ , Eric V. Bukovsky ₁

Affiliation

具有结构和成分空间控制的功能材料的 3D 打印可用于许多应用并增加设计空间。在这里，一种称为直接墨水书写 (DIW) 的基于微挤出的方法被用来通过改变填料和填料浓度调整双固化墨水配方来进一步提高 3D 复杂性。在这些油墨中，低分子量的次要丙烯酸酯组分能够在打印过程中通过快速 UV 固化来打印复杂的形状，而主要的热固化聚氨酯组分在形成聚氨酯接枝丙烯酸酯聚合物 (UGAP) 时提供弹性性能。印刷过程本身显示出对结构和成分的精细控制以及对具有广泛屈服应力（11. 5 和 8042 Pa），同时在打印过程中仍保持必要的形状保持。通过在油墨中加入微米或纳米尺寸的固体填料，可以实现广泛的结构和机械性能。此外，通过调节树脂和固体填料的比例，可以采用印刷模具和成孔步骤的各种组合来扩大设计空间。通过为软机器人等应用生产具有受控特性和性能的广泛复杂组件，证明了这些过程排列的强大和多功能性。可以采用印刷模具和成孔步骤的各种组合来扩展设计空间。通过为软机器人等应用生产具有受控特性和性能的广泛复杂组件，证明了这些过程排列的强大和多功能性。可以采用印刷模具和成孔步骤的各种组合来扩展设计空间。通过为软机器人等应用生产具有受控特性和性能的广泛复杂组件，证明了这些过程排列的强大和多功能性。

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Spatially Controlled 3D Printing of Dual-Curing Urethane Elastomers

3D printing of functional materials with spatial control of structure and composition is useful for many applications and increases design space. Here, a microextrusion-based method, known as direct ink writing (DIW), is harnessed to further advance 3D complexity by tuning dual-cure ink formulations via varying fillers and filler concentrations. In these inks, low-molecular-weight minor acrylate components enable printing of complex shapes by rapid UV curing during printing while the major heat-cured urethane components provide elastomeric properties when forming a urethane-grafted acrylate polymer (UGAP). The printing process itself displays exquisite control of structure and composition as well as robustness to inks exhibiting a wide range of yield stresses (between 11.5 and 8042 Pa) while still maintaining necessary shape retention during printing. By incorporating micro- or nanosized solid fillers in the inks, an expansive range of both structural and mechanical properties are achievable. Additionally, by modulating the ratio of resin and solid fillers, various combinations of print-mold and pore-forming steps can be employed to expand the design space. The power and versatility of these process permutations are demonstrated by producing a broad range of complex components with controlled properties and performance for applications such as soft robotics.

更新日期：2021-10-10

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