Chemically resistant polymer materials are of great interest due to their versatile implementation in a broad range ofapplications, including the design of robust microfluidic devices. While flow cells, conventionally fabricated by usingpoly(dimethylsiloxane) (PDMS), are hardly resistant toward organic solvents, fluorinated materials are chemically inert.However, focusing on the latest developments in microfluidic device design via high-resolution additive manufacturing,e.g., based on micro-stereolithography (μSL), only a few resin formulations have been demonstrated suitable for 3Dprinting chemically resistant polymer objects. Here, we introduce a homemade resin formulation based on1H,1H,6H,6H-Perfluoro-1,6-hexyl diacrylate (PFHDA) for high-resolution 3D printing utilizing μSL. By investigatingthe optical dose, the wettability, the resistance toward organic solvents, and the minimal resolution achievable, wefabricate inner structures down to 200 μm. Finally, water-in-oil (W/O) emulsions are generated in a 3D-printed dropletmaker with planar microchannel geometry made from the PFHDA-based resin yielding droplets with an averagediameter of 271 μm ± 26 μm. The presented material is resistant against commonly used organic solvents includingTHF, DMF and toluene with a swelling below 1.5% and shows no solvent-induced damage to the micro-printedstructure, which makes the PFHDA-based resin a promising base material for several potential applications such asorganic synthesis in microreactors.
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