Synthesis and characteristics of a semi‐interpenetrating polymer network based on chitosan/polyaniline under different pH conditions

Chitosan/polyaniline (PANi) semi‐interpenetrating network (semi‐IPN) polymers were prepared under the condition of HCl aqueous solution (pH < 1). The structure and half oxidation state of emeraldine base PANi, adjusted to pH < 1, underwent changes of structure and electrical properties. Changes of structural properties were investigated using FTIR spectroscopy, solid‐state 13C‐NMR, and wide‐angle X‐ray diffraction. Spectroscopic studies revealed that the PANi was converted to its pH‐switched emeraldine salt form. The surface conductivity of the semi‐IPN depended on the chitosan/PANi weight ratio and the pH condition. The conductivity of the semi‐IPNs increased with increasing PANi content with adjusted pH < 1.