Use of Ionic Green Solvent for the Synthesis of Optically Active Aromatic Polyamides Containing a L-Leucine Moiety under Microwave Irradiation

Authors: Mallakpour, Shadpour; Zadehnazari, Amin

Source: Designed Monomers & Polymers, Volume 12, Number 6, 2009 , pp. 589-604(16)

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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.

Keywords: OPTICALLY ACTIVE POLYMERS; THERMALLY STABLE POLYAMIDES; IONIC LIQUIDS; GREEN CHEMISTRY; MICROWAVE IRRADIATION

Document Type: Regular paper

DOI: http://dx.doi.org/10.1163/138577209X12519685854662

Affiliations: 1: Organic Polymer Chemistry Research Laboratory, Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, I.R. Iran

Publication date: 2009-10-01