engleski

Influence of temperature program on kinetics of the isothermal decomposition of poly(ethylene oxide)

Polyethylene oxide (PEO) plays a significant role in many industrial applications (polymer electrolytes, thermal energy storage materials, paints, coatings, ...). Its thermal properties and thermal degradation have been extensively studied and documented. This work is focused on the influence of temperature program to reach the temperature of isothermal decomposition on kinetic parameters of the investigated process. For the purpose of investigation, four different temperature programs (5 °C/min, 10 °C/min, 20 °C/min and 40 °C/min) were used for heating up samples from 50 °C up to the temperature of the isothermal decomposition. Isothermal decomposition was performed at four temperatures at which thermal decomposition of PEO is completely finished within 60 minutes. Netzsch Thermokinetics software was used for the purpose of kinetic analysis. Isoconversional method showed that activation energy does not significantly change with conversion at all applied conditions, so isothermal decomposition of PEO is identified as kinetically simple, single step process. Linear regression method was used for calculation of the kinetic parameters: reaction model, activation energy and pre-exponential factor. It was found that temperature program applied for heating up samples up to the temperature of the isothermal decomposition does not change reaction model but influences activation energy and pre-exponential factor of the investigated process.

Isothermal degradation ; Kinetic analysis ; Poly(ethylene oxide

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