Thermogravimetric analysis of polyethylene oxide (powder and nanofibers obtained by force spinning water or chloroform solutions oxide) was studied using different theoretical models such as Friedman Flynn-Wall-Ozawa. A semiempirical approach for estimating the “sigmoid activation energy” from thermal degradation suggested confirmed experimental data on PEO powder nanofibers' mats. The equation...

Thermal decomposition and kinetics behaviour of the de-oiled seed cake of African star apple (Chrosophyllum albidum) has been investigated using thermogravimetry under the nitrogen atmosphere from ambient temperature to 900 °C. The thermogravimetric data for the cake decomposition at six different heating rates (5, 10, 15, 20, 30 and 40 °C/min) were used to evaluate the kinetic decomposition of...

Chinese fir (Cunninghamia lanceolata) has great potential as a future bio-energy resource in China. Thermogravimetry (TG) was used to investigate the thermal decomposition process of Chinese fir, including heartwood and sapwood. The Flynn-Wall-Ozawa and Coats-Redfern (modified) methods were used to determine the activation energy. A combination of TG and Fourier transform infrared spectrometry ...

Oxygen release from metal oxides at high temperatures is relevant to many thermally activated chemical processes, including chemical-looping combustion, solar thermochemical cycles and energetic thermite reactions. In this study, we evaluated the thermal decomposition of nanosized metal oxides under rapid heating (~10(5) K s(-1)) with time-resolved mass spectrometry. We found that the effective...

The objective of this work is to obtain the thermodynamic parameters (the changes in enthalpy, Gibbs free energy, and entropy) two degradation steps observed three novel families organometallic dendrimers. isoconversional Flynn–Wall–Ozawa (FWO) model was employed calculate effective activation energy pre-exponential factor. enthalpy entropy revealed a quite consistent tendency with whereas chan...

The present study reports the results obtained after analysis of thermal stability and decomposition kinetics widely used synthetic derivative estradiol, ethinylestradiol (EE), as a pure active pharmaceutical ingredient. As investigational tools, Fourier transformed infrared spectroscopy (FTIR), analysis, modeling EE were employed. kinetic was realized using three methods, namely Kissinger, Fri...