Preparation and Properties of a Chitosan-Hyaluronic Acid-Polypyrrole Conductive Hydrogel Catalyzed by Laccase

Electro conductive hydrogels, consisting of chitosan (CS), hyaluronic acid (HA), and polypyrrole (PPy), were prepared via an in situ enzymic polymerization of pyrrole in the CS-HA hydrogel, using laccase as the catalyst. This CS-HA-PPy composite hydrogel showed good conductivity. The chemical structure and morphology of this conductive hydrogel were studied by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction technique. For CS-HA-PPy and CH-HA hydrogel, the temperature at which fastest decomposition occurred was 260 and 244 A degrees C, respectively. That means the thermal stability of CS-HA-PPy is better than CS-HA hydrogel. The conductive hydrogel also showed excellent swelling and deswelling behaviors.