Preparation and characterization of ion exchange membranes based on polyaniline and thermoplastic polyurethane blends
Keywords:Polyaniline, thermoplastic polyurethane, ion exchange membranes, 4-probe electrical conductivity, FTIR
This research work discusses the synthesis and characterization of cation-exchange membranes comprising thermoplastic polyurethane (TPU) and polyaniline (PAni) doped with camphor sulphonic acid (CSA). Polyaniline was synthesized by solution-phase polymerization technique and in these blend membranes PAni content varied between 10-40 % of PAni. The chemical structure of these composite membranes were studies using Fourier-transform infrared (FTIR) spectroscopy whereas mechanical and electrical properties were measured using Universal testing machine and 4-probe electrical conductivity measurement set up, respectively. Cation exchangeability was determined by measuring ion-exchange capacity of these membranes. The FTIR spectra showed successful incorporation of PAni in the blend where infrared characteristic peaks increased by increasing PAni content. Ion-exchange capacity and electrical conductivity increased by increasing PAni content in the membranes whereas the mechanical properties showed a significant decrease confirming that PAni was incorporated as non-reinforcing filler in these blends.
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