State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
School of Chemistry and Pharmaceutical Engineering, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian, 271016, China.
Macromol Rapid Commun. 2020 May;41(10):e2000064. doi: 10.1002/marc.202000064. Epub 2020 Apr 19.
Three-dimensional (3D) printing of poly(dimethylsiloxane) (PDMS) is realized with a two-state curing strategy, i.e., photocuring for additively manufacturing high-precision architectures followed by thermal cross-linking for high-performance objects, taking Sylgard-184 as an example. In the mixture of base and curing agent of Sylgard-184, the photocuring ingredient methacrylated PDMS is incorporated to form hybrid inks with not only high-efficiency UV curing ability but also moderate rheological properties for 3D printing. The inks are then used to additively manufacture high-precision architectures by UV-assisted direct ink writing. Various architectures such as lattices and honeycombs, channels that can be used as microfluidics, and pressure-proof pipes with a feature size of ≈100 µm, can be readily printed. Thereafter, thermal cross-linking at elevated temperature is conducted to obtain the 3D PDMS objects with comparable properties to Sylgard-184. The facile, universal two-stage approach to 3D printing of PDMS can facilitate the development of microfluidics, flexible electronics, soft robots, and so on.
采用双固化策略实现了聚二甲基硅氧烷（PDMS）的三维（3D）打印，即光固化用于增材制造高精度结构，然后热交联用于高性能物体，以 Sylgard-184 为例。在 Sylgard-184 的基础和固化剂混合物中，加入了甲基丙烯酰化 PDMS 作为光固化成分，形成了具有高效 UV 固化能力和适度流变性能的混合油墨，可用于 3D 打印。然后，通过紫外辅助直接写入法将油墨添加制造高精度结构。可以轻松打印各种结构，如晶格和蜂窝、可用作微流控的通道以及具有 ≈100 µm 特征尺寸的耐压管道。之后，在升高的温度下进行热交联，以获得与 Sylgard-184 相当的 3D PDMS 制品。这种简便、通用的 PDMS 3D 打印两阶段方法可以促进微流控、柔性电子、软体机器人等的发展。
