Abstract
A new mesoporous polymer constituting of Fe(III)-poly-(p-phenylenediamine) (Fe-MPPD) has been synthesized by using the supramolecular assembly of anionic surfactant sodium dodecylsulphate (SOS) as template under mild conditions. The polymeric framework resulted via simultaneous oxidative polymerization of p-phenylenediamine (PPD) and cross-linking in the presence of Fe(III) ion using water as reaction medium. Upon removal of template SOS molecules through solvent extraction this material has retained the 20-hexagonal nanostructure. The presence of Fe(III) in the polymeric material has been confirmed by atomic absorption spectroscopy (AAS, 18.3 and 10.2 wt% for two samples) and Fe-57 Mossbauer spectroscopy. The temperature dependence of zero-field cooled magnetization showed spin freezing temperature at 3.5 K, below which there is a large coercivity due to significant contribution of surface anisotropy. The porosity and the magnetic property of the material are found to be dependent on the molar ratio Fe(III):PPD and SDA content. (C) 2011 Elsevier Inc. All rights reserved.