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Kinetic analysis of poly(ethylene oxide)/lithium montmorillonite nanocomposites

Poly(ethylene oxide)/lithium montmorillonite (PEO/LiMMT) nanocomposites have been prepared by melt intercalation and non-isothermally degraded in nitrogen atmosphere [1]. The obtained non-isothermal data have been used in this work for the kinetic analysis of the degradation process. Kinetic analysis was performed using isoconversional Friedman (FR) method in combination with the multivariate non-linear regression method incorporated in Netzsch Thermokinetics Professional software. Our earlier investigations have shown that thermal degradation of PEO is simple (one-step) process [1] while thermal degradation of PEO/LiMMT nanocomposites is complex (multi-step) process that may involve several overlapping or consecutive processes [2]. Kinetic analysis performed for the purpose of this work revealed the complexity of the thermal degradation process for both pure PEO and all PEO/LiMMT nanocomposites. The contribution of the each individual process has been determined and each of them was independently analyzed. Kinetic parameters (activation energy, pre-exponential factor and kinetic model) have also been calculated for each degradation stage of all investigated samples.

Kinetic analysis; Nanocomposite; Poly(ethylene oxide)

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