Benzotriazole-loaded chitosan–guar gum interpenetrating polymeric network (IPN) particles: a novel approach for anticorrosive coating development

The anticorrosive properties of epoxy coatings were enhanced by incorporating an interpenetrating polymer network (IPN) of chitosan (CS) and guar gum (GG), with a 1:1 ratio. These IPN particles were synthesized by varying benzotriazole (BNZ) concentration and crosslinked using glutaraldehyde (GA). Additionally, the particles were coated with a polymeric shell of polypyrrole (PPy) through in situ oxidative polymerization using an emulsion technique. The modified IPN and PPy-coated IPN particles were then integrated into epoxy coatings to improve corrosion resistance. Characterization techniques such as Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) were used to confirm the successful synthesis and morphology of the particles, as well as their integration into the coatings. Corrosion resistance testing was carried out using salt spray tests and electrochemical impedance spectroscopy (EIS), showing significant improvement in the barrier properties of epoxy coatings with the addition of both IPN and PPy-coated IPN particles. The FTIR analysis confirmed the chemical incorporation of these particles into the epoxy matrix, contributing to enhanced protective properties by impeding the penetration of corrosive ions. This approach demonstrates a promising method for improving the durability of epoxy coatings in aggressive environments such as marine and industrial conditions.