Abstract
An efficient, fast and easy method for the synthesis of new optically active and thermally stable aromatic polyamides (PAs) containing a pendant phthalimide group and L-leucine flexible side-spacer using ionic liquid (IL) by microwave irradiation, as well as conventional heating, has been investigated. ILs are outstanding microwave-absorbing agents owing to their high ionic conductivity and polarizability, thus leading to a high heating rate and a considerably shortened reaction time. The resulting PAs have a inherent viscosity in the range of 0.31–0.96 dl/g. All of the obtained polymers are readily soluble in many organic solvents and showed good thermal stability associated with high glass-transition temperatures (above 200°C), as measured by differential scanning calorimetry. Thermogravimetric analysis showed that the 10% weight-loss temperatures in nitrogen were in the range 371–380°C. The interpretation of kinetic parameters (E, ΔH, ΔS and ΔG) of thermal decomposition stages has been evaluated using Coats–Redfern equations.
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