Akademik Veri Yönetim Sistemi
Applied Catalysis B: Environmental, cilt.132-133, ss.370-378, 2013 (SCI-Expanded)
The nature and the extent of degradation of polyamide 6 (PA6) in the presence of layered birnessite-type manganese oxide (LMO) were analysed by thermogravimetric analysis under static air atmosphere at several heating rates between 5°C/min and 20°C/min. The samples were characterized using infrared (IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 gas adsorption-desorption and thermal analysis (TA) techniques. XRD and DTA results for LMO showed that the oxidative transformation of MnO2 was occured on heating from 300°C to 500°C. The IR spectra of Mn-O band proved the covalent character of oxygen bonding to the metal ions of the surface. The addition of LMO caused the change in the crystalline phase of PA6 from predominantly α to largely γ phase. The activation energy for degradation estimated by Kissinger method for PA6 and 10wt.% LMO/PA6 composite were found to be 213 and 118kJ/mol in static air atmosphere, respectively. The experimental results revealed that the addition of 10wt.% LMO decreased the thermal stability in static air of PA6 by about 80°C. © 2012 Elsevier B.V.