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The polyurethane (PU)/polyaniline (PANI) IPN, at three composition ratios (95/05, 75/25, 60/40), were analyzed, after the action of the urease enzyme, by means of the Hyperchem 8v software. Theoretical analysis of Gibbs free energy, FTIR, and 13 C-NMR were done. The generation of functional groups due to hydrolysis was analyzed by FTIR. The 13 C-NMR spectra of the three ratios showed a superposition of the individual spectra of PU and PANI and an appreciable decrease of the signals due to thedoi:10.1590/0104-1428.1496 fatcat:krhbmwtjfjecjbowsjeslxwihi