Department of NanoEngineering, University of California San Diego, Jacobs School of Engineering, La Jolla, California92093, United States.
ACS Appl Mater Interfaces. 2022 Dec 7;14(48):54245-54255. doi: 10.1021/acsami.2c16507. Epub 2022 Nov 28.
Recent developments of highly expandable foaming pre-polymer resins for lithographic additive manufacturing have allowed for the creation of structures larger than a printer's build envelope. To fully utilize the capabilities of this technology, the mechanical properties of these foams must be improved. This manuscript presents one method for strengthening these lightweight polymeric structures via aerosol spray application of a high-strength, low-viscosity photocurable coating. This method is free from the reliance on often complex, large, or bulky on-site equipment ordinarily required by conventional high-strength spray coating. The newly formulated photocurable resin can be applied using an ordinary cordless paint sprayer and cured using sunlight in less than a minute, enabling the rapid production of large, load-bearing structures from a small volume of feedstock and low-cost portable equipment. A comprehensive screening process for resin formulations, detailed mechanical compression and tensile analysis of coated polymer structures, and an applied technical demonstration of the technology are described. The photocurable coating described herein greatly strengthens porous polymeric structures using a method that can be easily implemented.
近年来，高度可膨胀的发泡预聚物树脂在光刻增材制造领域的发展，使得制造大于打印机构建范围的结构成为可能。为了充分利用这项技术的能力，必须提高这些泡沫的机械性能。本文提出了一种通过气溶胶喷雾应用高强度、低粘度的光固化涂层来增强这些轻质聚合物结构的方法。这种方法无需依赖于传统高强度喷涂通常需要的复杂、大型或庞大的现场设备。新配方的光固化树脂可以使用普通无绳油漆喷雾器进行喷涂，并在不到一分钟的时间内用阳光固化，从而可以使用少量原料和低成本的便携式设备快速生产出大型承重结构。本文描述了树脂配方的全面筛选过程、涂覆聚合物结构的详细机械压缩和拉伸分析，以及该技术的应用技术演示。本文所述的光固化涂层通过一种易于实施的方法大大增强了多孔聚合物结构。
