3D Printing of Dual-Physical Cross-linking Hydrogel with Ultrahigh Strength and Toughness,Chemistry of Materials

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3D Printing of Dual-Physical Cross-linking Hydrogel with Ultrahigh Strength and Toughness
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-11-30 , DOI: 10.1021/acs.chemmater.0c02941
Pan Jiang _{1,

2} , Peng Lin ₃ , Chang Yang ₄ , Hongling Qin ₄ , Xiaolong Wang ₁ , Feng Zhou ₁

Affiliation

3D printing of hydrogels with high intrinsic mechanical performance has significant applications in many fields yet has been proven to be a fundamental challenge. Here, 3D printing of ultrahigh strength hydrogels is achieved by constructing cross-linkingDPC networks based on poly(vinyl alcohol) (PVA) and chitosan (CS). The hybrid ink with moderate rheology for direct ink writing is employed to manufacture complex hydrogel structures, first. Then, the cyclic freezing–thawing followed by sodium citrate solution soaking realize the first network of PVA crystallization and the second one of CS ionic interaction between amino and carboxyl groups. The optimized DPC hydrogel displays a tensile strength of 12.71 ± 1.32 MPa at a strain of 302.27 ± 15.70%, Young’s modulus of 14.01 ± 1.35 MPa, and work of extension at fracture W_ext of 22.10 ± 2.36 MJ m^–3 because of the dominant energy dissipation of the stiff CS ionic network. Moreover, the tearing test supports that this DPC hydrogel possesses a high toughness of 9.92 ± 1.05 kJ m^–2. This protocol can readily realize not only the hydrogel lattice, honeycomb, and spring, but also secondary-shaping hydrogel objects including whale, octopus, and butterfly via a local DPC strategy. Integrating the advanced 3D-printing technique with high-performance hydrogels uncovers a feasible strategy to broad practical applications in engineering, intelligent machine, and soft robotics.

中文翻译：

具有超高强度和韧性的双物理交联水凝胶的3D打印

具有高固有机械性能的水凝胶的3D打印在许多领域都有重要的应用，但已被证明是一项基本挑战。在这里，超高强度水凝胶的3D打印是通过构建基于聚乙烯醇（PVA）和壳聚糖（CS）的交联DPC网络来实现的。首先，采用具有适度流变性能的直接混合墨水来制造复杂的水凝胶结构。然后，循环冻融，然后柠檬酸钠溶液浸泡，实现了PVA结晶的第一个网络和氨基和羧基之间CS离子相互作用的第二个网络。优化的DPC水凝胶在302.27±15.70％的应变下表现出12.71±1.32 MPa的拉伸强度，14.01±1.35 MPa的杨氏模量以及在断裂W处的延伸功_ext为22.10±2.36 MJ m ^–3，因为刚性CS离子网络的主要能量耗散。此外，撕裂试验证明该DPC水凝胶具有9.92±1.05 kJ m ^–2的高韧性。通过本地DPC策略，此协议不仅可以轻松实现水凝胶晶格，蜂窝和弹簧，还可以二次成型水凝胶对象，包括鲸鱼，章鱼和蝴蝶。将先进的3D打印技术与高性能水凝胶集成在一起，为在工程，智能机器和软机器人中的广泛实际应用提供了一种可行的策略。

更新日期：2020-12-08

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