engleski

Thermal degradation behaviour of poly(3-hydroxybutyrate)/Cloisite 30B nanocomposites

This investigation is focused on the preparation of polymer nanocomposites of PHB with organically modified montmorillonite Cloisite 30B (30B), the effects of Cloisite 30B loading on the thermal stability of PHB and the determination of kinetic parameters and mechanism of their non-isothermal degradation. PHB/30B nanocomposites with compositions were prepared by solution intercalation method. The non-isothermal thermogravimetric analysis of PHB/30B nanocomposites was carried out over the temperature range 50-500°C at four heating rates (2, 5 ; 5 ; 10 and 20°C/min) in the nitrogen atmosphere. The invariant kinetic parameters method (IKP) was used in combination with isoconversional methods (Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose) to determine the kinetic triplet for the PHB/30B non-isothermal degradation, i.e. the activation energy (E), the pre-exponential factor (A) and the conversion function f(alpha).

kinetic analysis; polymer nanocomposites; thermogravimetry

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