Due to the block copolymer structure, these intrinsically thermo-responsive conducting polymers (TR-CP) showed self-assembly of well-defined and stable colloidal particles in water, that rapidly (< 1min) and reversibly formed a conductive hydrogel network above 35 °C. The TR-CP gels have good conductivity (~ 10 mS cm -1 ) and are cytocompatible in vitro and in vivo as prepared or in composites. We show that the TR-CP are self-healing and injectable and demonstrate their utility as reusable electrodes for surface electromyography (s-EMG). Due to their stimuli-responsive properties, tolerance to a range of pH and salt concentrations, and cytocompatibility, the TR-CP could be transformative for further bioelectronic applications such as adaptive, patternable, injectable and thermally degradable electrodes, scaffolds, and actuators.