engleski

Kinetic analysis of the isothermal degradation of PHB/OMMT nanocomposites

Polymer nanocomposites consisted of biodegradable poly(3-hydroxybutyrate) (PHB) and organically modified montmorillonite Cloisite25A (OMMT) as nanofiller with compositions PHB/OMMT 100/0, 100/1, 100/3, 100/5, 100/7 and 100/10 by weight were prepared by solution intercalation method. These samples were degraded isothermally for 120 min at 230, 235, 240 and 245º ; C in the nitrogen atmosphere. The addition of OMMT increases the thermal stability of PHB. The most pronounced effect has the addition of 7 wt. % of OMMT. The kinetic triplets (activation energy, E ; pre-exponential factor, A ; kinetic model g(alpha)) of the isothermal thermogravimetric degradation of pure PHB and PHB/OMMT nanocomposites were obtained by the combined use of reduced time plots method (RTP) and model-free integral isoconversional method.

isothermal degradation; kinetic analysis; nanocomposite

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