A Robust And Conductive PEDOT/PSS-Doped Hydrogel With Self-healability And Thermo-processability

Dual amide hydrogen bond crosslinked and strengthened high strength supramolecular polymer conductive hydrogels were fabricated by simply in situ doping poly?N-acryloyl glycinamide-co-2-acrylamide-2-methylpropanesulfonic??PNAGA-PAMPS?hydrogels with PEDOT/PSS.The nonswellable conductive hydrogels in PBS demonstrated high mechanical performances—0.22–0.58 MPa tensile strength,1.02–7.62 MPa compressive strength,and 817–1709%breaking strain.The doping of PEDOT/PSS could significantly improve the specific conductivities of the hydrogels,and the conductivity was in the range of 0.2 S m^-12.2S m^-1.Cyclic heating and cooling could lead to reversible sol-gel transition and self-healability due to the dynamic breakup and reconstruction of hydrogen bonds,and the self-healing effiency was up to 60%.The mending hydrogels recovered not only the mechanical properties,but also conductivities very well.The tensile strength was up to 500kPa after the self-healing process.These supramolecular conductive hydrogels could be designed into arbitrary shapes with 3D printing technique,and further,printable arbitrary shapes could be obtained by blending activated charcoal powder with PNAGA-PAMPS/PEDOT/PSS hydrogel under melting state.The fabricated supercapacitor via the conducting hydrogel electrodes possessed high capacitive performances.The results of MTT assay indicated that these cytocompatible conductive hydrogels whose cell viability was up to 74%have a great potential to be used as electro-active and electrical biomaterials.