Fabrication of post-curable, mechanically graded hydrogel with wide modulus range through graded DLP-printing
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Digital light processing (DLP) is a 3D printing technology that projects light onto a resin for layer-by-layer photopolymerization. In conventional DLP, a uniform intensity of light is used for single printing. However, when it comes to biomimicry using hydrogels for practical applications like tactile sensors or surgical models, we find that organs and tissues vary hugely from one another, and most of the times are inhomogeneous even within themselves. Here, we incorporate grayscale DLP (gDLP), where the intensity of light can be controlled by pixel, allowing the printed material to vary in property within a single model. And to widen the range of mechanical properties that can be covered with a single hydrogel ink, a two-step curing method has been incorporated. By adding ethylene diamine that reacts with diamine under heat into a PAAc-PEGDA-based hydrogel, a controlled post-heating step allows us a wide Young’s modulus range spanning from hundreds of kilopascals to a few megapascals.