A Superabsorbent Sodium Polyacrylate Printing Resin as Actuator Material in 4D Printing

Abstract Superabsorbent polymers are materials that exhibit a high swelling behavior in liquids and can hold the absorbed liquid even against externally applied pressure. They commercially used, for example, baby diapers, fake snow, or swellable children's toys. Most available superabsorbent based on polymerized crosslinked sodium acrylate. Here, material formulation to create 3D objects using stereolithographic printing of acrylate is demonstrated. The shows typical properties cannot be reached with conventional materials. printed structures swell strongly (up 20 times weight) aqueous environments still show 65% under an external load 100 kPa. This used parts automatically change their size shape when exposed water. To versatility this approach, selected printed, including ship medical stent. Also applicability actuation by structure demonstrated, which deforms self‐closing container upon exposure