Additive manufacturing of self-healing elastomers
Additive manufacturing of self-healing elastomers
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DOI：
10.1038/s41427-019-0109-y
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发表时间：
2019-02
影响因子：
9.7
通讯作者：
Kunhao Yu;A. Xin;Haixu Du;Ying Li;Qiming Wang
中科院分区：
文献类型：
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作者：
Kunhao Yu;A. Xin;Haixu Du;Ying Li;Qiming Wang
自然界在自我修复和3D成形方面都很出色;例如，可自我修复的人体器官具有功能几何形状和微观结构。然而，将人造自修复材料裁剪成复杂的结构面临着巨大的挑战。在这里，我们报告了一种基于光聚合的增材制造具有自由形式架构的可自愈合弹性体结构的范例。该范例依赖于具有硫醇和二硫化物基团的分子设计的光弹性体油墨，其中前者在增材制造过程中促进硫醇-烯光聚合，而后者在自修复过程中实现二硫化物复分解反应。我们发现，巯基和二硫基之间的竞争控制的光固化速率和自修复效率的光弹性体。光弹性体的自愈合行为的理解与理论模型，与实验结果吻合良好。利用投影微立体光刻系统，我们展示了用于3D软致动器，多相复合材料和建筑电子产品的单材料和多材料自修复结构的快速增材制造。与各种基于光聚合的增材制造系统兼容，预计光弹性体将为制造自由形式架构和有效自修复都是理想的结构开辟有前途的途径。
Nature excels in both self-healing and 3D shaping; for example, self-healable human organs feature functional geometries and microstructures. However, tailoring man-made self-healing materials into complex structures faces substantial challenges. Here, we report a paradigm of photopolymerization-based additive manufacturing of self-healable elastomer structures with free-form architectures. The paradigm relies on a molecularly designed photoelastomer ink with both thiol and disulfide groups, where the former facilitates a thiol-ene photopolymerization during the additive manufacturing process and the latter enables a disulfide metathesis reaction during the self-healing process. We find that the competition between the thiol and disulfide groups governs the photocuring rate and self-healing efficiency of the photoelastomer. The self-healing behavior of the photoelastomer is understood with a theoretical model that agrees well with the experimental results. With projection microstereolithography systems, we demonstrate rapid additive manufacturing of single- and multimaterial self-healable structures for 3D soft actuators, multiphase composites, and architected electronics. Compatible with various photopolymerization-based additive manufacturing systems, the photoelastomer is expected to open promising avenues for fabricating structures where free-form architectures and efficient self-healing are both desirable.