| 초록 |
Mechanically enhanced electroactive hydrogels for 3D printing based on poly(3-sulfopropyl acrylate) (PSPA) were synthesized using glycidyl methacrylated hyaluronic acid (GMHA) as an additional crosslinker. PSPA hydrogel is electroactive but it’s in itself too brittle to be printed by 3D printers. The addition of GMHA improved stretchability up to 1.49 from 1.28 of GMHA-free sample, maintaining the same level of Young’s modulus and electroactivity. Fracture toughness of PSPA hydrogel remarkably increased with GMHA addition, from 11 J/m2 of GMHA-free sample to 40 J/m2 of GMHA-added sample. It can be considered that the additional crosslinks derived from GMHA polymer chains effectively hold the polymer networks up to 1.75 times higher deformation. With the mechanically enhanced electroactive hydrogels, we managed to fabricate various shapes of electroactive hydrogels. Adding GMHA-like crosslinker can be applied to any types of hydrogels for enhancing their stretchability and toughness. |
