Microwave heating in combination with ionic liquids: synthesis and properties of novel optically active polyamides, thermal degradation and electrochemical stability on multi-walled carbon nanotubes electrode

Rapid and efficient synthesis of novel optically active polyamides (PAs) was achieved under microwave irradiation. Thus, step-growth polymerization of a novel chiral diacid containing naphthalimide and flexible chiral groups with different diisocyanates in the presence of a small amount of ionic liquids that act as a primary microwave absorber as well as conventional heating was carried out. The PAs were characterized using FT-IR, ¹H NMR, UV–vis spectroscopy, fluorimetry and elemental analysis. Thermal properties of newPAs were evaluated by thermogravimetric analysis and differential scanning calorimetry. The interpretation of kinetic parameters (E, ΔH, ΔS and ΔG) of thermal decomposition stages has been evaluated using Coats–Redfern equations. Here also for the first time we report an electrochemical oxidation method based on the adsorptive stripping cyclic voltammetry technique on the multi-walled carbon nanotube-modified glassy carbon electrode for the investigation of electrochemical stability of the resulting polymers in aqueous solution at various pH values.