Reconfigurable 4D Printing of Reprocessable and Mechanically Strong Polythiourethane Covalent Adaptable Networks,Advanced Functional Materials

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Reconfigurable 4D Printing of Reprocessable and Mechanically Strong Polythiourethane Covalent Adaptable Networks
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-08 , DOI: 10.1002/adfm.202203720
Chenhui Cui ₁ , Le An ₂ , Zhuolin Zhang ₁ , Mengke Ji ₂ , Kun Chen ₃ , Yuxuan Yang ₄ , Qi Su ₃ , Fang Wang ₄ , Yilong Cheng ₁ , Yanfeng Zhang ₁

Affiliation

4D printing has attracted tremendous interest because of its potential applications in smart devices, biomedical and tissue engineering. However, conventional shape memory polymers suffer from the single permanent shape and recovery direction, the flexibility of 4D printing is significantly limited. Besides, the cross-linked networks of photocuring 3D-printed objects cannot be reprocessed or repaired. To address these issues, the dynamic thiocarbamate bonds are introduced into the photocurable methacrylate to prepare reprocessable and self-healable 4D printing polythiourethane (4DP-PTU) with Young's modulus of 1.2 GPa and tensile strength of 61.9 MPa. The printed objects can be easily repaired by reprinting on the damaged surface. The shape memorized 4DP-PTU features high shape fixity and shape recovery, and reconfigurable permanent shape brought by the solid-state plasticity. A dual-mode triggered alarm is obtained by the incorporation of carbon nanotubes to demonstrate the potential application in smart alarms for warning of laser exposure or fire case. Moreover, the surface wettability and cell adhesion performance of 4DP-PTU with excellent biocompatibility can be facilely adjusted through the exchange reaction with sulfhydryl compounds. Accordingly, 4DP-PTU may show vast potential applications in the field of robotics, smart alarm, bio-implants and in solving the environmental challenges of 3D-printed products.

中文翻译：

可再加工和机械强度高的聚硫氨酯共价自适应网络的可重构 4D 打印

4D打印因其在智能设备、生物医学和组织工程中的潜在应用而引起了极大的兴趣。然而，传统的形状记忆聚合物存在单一的永久形状和恢复方向，4D打印的灵活性受到很大限制。此外，光固化 3D 打印物体的交联网络无法再加工或修复。为了解决这些问题，将动态硫代氨基甲酸酯键引入光固化甲基丙烯酸酯中，制备出杨氏模量为 1.2 GPa，拉伸强度为 61.9 MPa 的可再加工和自修复的 4D 打印聚硫氨酯 (4DP-PTU)。通过在损坏的表面上重新打印，可以很容易地修复打印的物体。形状记忆4DP-PTU具有高形状固定性和形状恢复，以及固态可塑性带来的可重构永久形状。通过加入碳纳米管获得双模式触发警报，以展示在智能警报中的潜在应用，以警告激光暴露或火灾情况。此外，具有优异生物相容性的4DP-PTU的表面润湿性和细胞粘附性能可以通过与巯基化合物的交换反应轻松调节。因此，4DP-PTU 可能在机器人技术、智能警报、生物植入物以及解决 3D 打印产品的环境挑战方面显示出巨大的潜在应用。具有优异生物相容性的4DP-PTU的表面润湿性和细胞粘附性能可以通过与巯基化合物的交换反应轻松调节。因此，4DP-PTU 可能在机器人技术、智能警报、生物植入物以及解决 3D 打印产品的环境挑战方面显示出巨大的潜在应用。具有优异生物相容性的4DP-PTU的表面润湿性和细胞粘附性能可以通过与巯基化合物的交换反应轻松调节。因此，4DP-PTU 可能在机器人技术、智能警报、生物植入物以及解决 3D 打印产品的环境挑战方面显示出巨大的潜在应用。

更新日期：2022-06-08

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