Synthesis and characterization of polymeric acid-doped polyaniline interpenetrating polymer networks

Abstract

Polyaniline (PANI)/poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS) semi-interpenetrating network polymers (semi-IPNs) were prepared using the simultaneous method. The formation and properties of the interpenetrating PANI/PAMPS semi-IPNs were investigated using Fourier transform infrared spectroscopy, X-ray diffraction, solid-state C-13-NMR, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The interaction of PAMPS with PANI as a polymeric acid dopant was also investigated. These semi-IPNs had a different microstructure compared to that of pure PANI. Packing structures and several decomposition steps were ordered for each semi-IPN, while pure PANI exhibits a single amorphous peak and one decomposition step. The NMR spectra show that these peaks broaden and shifted downfield in the semi-IPNs. A thermal reaction between PANI and PAMPS was observed using DSC and TGA, and the data from the two techniques are in agreement.