Vibrational, thermal, optical and magnetic investigations of PVA films filled with FeCl3 and CoCl2

PVA films filled with different mass fractions of X FeCl3 (15-X) CoCl2 were investigated, vibrationally, thermally, optically and magnetically. An assignment of the most notably infrared (IR) peaks was done. Significant vibrational deformations of certain IR peaks with filling were studied. The main characterizing temperatures were recorded, assigned and their FL dependence were studied using differential scanning calorimetric (DSC). The thermal analysis depicts better thermal properties of the filled polymer with increasing X that represents interesting industrial applications. The absorption peaks in the ultraviolet and visible regions were detected and assigned. Electron paramagnetic resonance (EPR) spectra are complicated and characterized by the hyperfine structure. The main features of the EPR investigations are the orbital contribution to the magnetic moment, the important role of the spin-orbit coupling, the localization of the paramagnetic centers as well as the ionic cluster formations. The linear temperature dependence of the reciprocal dc magnetic susceptibility obeys Curie-Weiss behavior characterized by localized magnetic moments. A correlation between vibrational, thermal, optical, and magnetic properties was done. (C) 2009 Elsevier B.V. All rights reserved.