3D Printing of Strong and Tough Double Network Granular Hydrogels,Advanced Functional Materials

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3D Printing of Strong and Tough Double Network Granular Hydrogels
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-10-29 , DOI: 10.1002/adfm.202005929
Matteo Hirsch ₁ , Alvaro Charlet ₁ , Esther Amstad ₁

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Many soft natural tissues display a fascinating set of mechanical properties that remains unmatched by manmade counterparts. These unprecedented mechanical properties are achieved through an intricate interplay between the structure and locally varying the composition of these natural tissues. This level of control cannot be achieved in soft synthetic materials. To address this shortcoming, a novel 3D printing approach to fabricate strong and tough soft materials is introduced, namely double network granular hydrogels (DNGHs) made from compartmentalized reagents. This is achieved with an ink composed of microgels that are swollen in a monomer‐containing solution; after the ink is additive manufactured, these monomers are converted into a percolating network, resulting in a DNGH. These DNGHs are sufficiently stiff to repetitively support tensile loads up to 1.3 MPa. Moreover, they are more than an order of magnitude tougher than each of the pure polymeric networks they are made from. It is demonstrated that this ink enables printing macroscopic, strong, and tough objects, which can optionally be rendered responsive, with high shape fidelity. The modular and robust fabrication of DNGHs opens up new possibilities to design adaptive, strong, and tough hydrogels that have the potential to advance, for example, soft robotic applications.

中文翻译：

强韧双网状颗粒水凝胶的3D打印

许多柔软的天然组织显示出令人着迷的一组机械性能，而这些性能仍然是人造的同类产品无法比拟的。这些前所未有的机械性能是通过结构之间的复杂相互作用以及局部改变这些天然组织的成分来实现的。在软合成材料中无法达到这种控制水平。为了解决这个缺点，引入了一种新颖的3D打印方法来制造坚韧的软质材料，即由分隔试剂制成的双网状颗粒水凝胶（DNGH）。这是由一种由微凝胶组成的墨水实现的，该微凝胶在含单体的溶液中会溶胀。油墨经过添加剂制造后，这些单体被转化为渗滤网络，从而形成DNGH。这些DNGH足够坚硬，可以重复支撑高达1.3 MPa的拉伸载荷。而且，它们比它们所制成的每个纯聚合物网络都要坚韧一个数量级。事实证明，这种油墨可以印刷宏观的，坚固的和坚硬的物体，可以选择以高保真度使之响应。DNGH的模块化且坚固耐用的制造方式为设计自适应，坚固而坚韧的水凝胶开辟了新的可能性，这些水凝胶有可能推动软机器人应用领域的发展。具有高保真度。DNGH的模块化且坚固耐用的制造方式为设计自适应，坚固而坚韧的水凝胶开辟了新的可能性，这些水凝胶有可能推动软机器人应用领域的发展。具有高保真度。DNGH的模块化且坚固耐用的制造方式为设计自适应，坚固而坚韧的水凝胶开辟了新的可能性，这些水凝胶有可能推动软机器人应用领域的发展。

更新日期：2020-10-29

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