4D打印智能、以珍珠母为灵感的有机陶瓷复合材料
4D-Printing of Smart, Nacre-Inspired, Organic-Ceramic Composites
摘要：
近年来，形状记忆聚合物的增材制造由于其在诸如生物医学和航空航天等各种行业中的多方面潜在应用而获得了极大的兴趣。然而，聚合物的机械性能，特别是刚度和强度，经常阻碍它们在机械要求高的应用中的使用，例如作为结构材料。在这项工作中，我们生产了具有共价自适应网络的nacre灵感复合材料，它能够实现快速和机械无损的自我修复，重塑和形状记忆能力。我们展示了一种新的直写4D打印策略，可以打印基于氧化铝片晶和玻璃体的智能、珍珠启发的有机陶瓷复合材料，与原始玻璃体相比，其拉伸强度和刚度分别高达3.3倍和26.7倍。据我们所知，我们首次介绍了一种用于nacre启发复合材料的单步4D打印工艺，该工艺利用悬浮液扩散使微米级氧化铝片晶沿共同平面排列，并利用溶剂蒸发诱导单体的缩聚，从而在悬浮液挤出后产生乙烯基氨基甲酸酯玻璃化物。这项工作提出了一种在环境打印条件下的简单直接写入4D打印策略，为各种行业感兴趣的智能有机陶瓷复合材料的自适应增材制造奠定了基础。
英文摘要：
Additive manufacturing of shape memory polymers has gained tremendous interest in recent years due to their versatile potential applications in various industries, such as biomedicine and aerospace. However, the polymers' mechanical properties, specifically stiffness and strength, often hinder their use in mechanically demanding applications, e.g. as structural materials. In this work we produced nacre-inspired composites with a covalent adaptable network, which enables fast and mechanically lossless self-healing, reshaping, and shape memory capabilities. We demonstrate a novel direct write 4D-printing strategy to print smart, nacre-inspired, organic-ceramic composites based on alumina platelets and vitrimers with up to 3.3 and 26.7 times higher tensile strength and stiffness, respectively, in comparison to the pristine vitrimer. To the best of our knowledge, we introduce for the first time a single step 4D-printing process for nacre-inspired composites, that exploits suspension spreading to align micron sized alumina platelets along a common plane, and which utilizes solvent evaporation to induce polycondensation of the monomers resulting in a vinylogous urethane vitrimer after extrusion of the suspension. This work presents a facile, direct write 4D-printing strategy at ambient printing conditions, establishing a foundation for adaptive additive manufacturing of smart organic-ceramic composites of interest to various industries.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
