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Differential scanning calorimetry analysis of poly(3-hydroxybutyrate) nanocomposites

Polymer nanocomposites consisted of biodegradable poly(3-hydroxybutyrate) (PHB) and organically modified montmorillonite Cloisite30B (30B) as nanofiller were prepared by solution intercalation method. Melting and crystallization behaviours of pure PHB and PHB/30B nanocomposites were investigated by differential scanning calorimetry (DSC). The overall melting enthalpy and consequently the overall degree of crystallinity decrease with 30B loading compared to pure PHB, respectively, while the melting temperature remain unchanged. The results also suggest that 30B probably acts as a nucleating agent for PHB. The crystallization temperature of PHB/30B nanocomposites increases with 30B loading compared to pure PHB. In amounts up to 5 wt. % 30B influences the crystallization of PHB in two opposite ways: it acts as effective nucleating agent and increases the crystallization rate of PHB, while due to intercalation the overall degree of crystallization of PHB is decreased. The most pronounced nucleation effect was observed at 3 wt. % of 30B. Higher loadings decrease both these values. Higher 30B loadings decrease these values compared to pure PHB.

differential scanning calorimetry; nanocomposites; poly(3-hydroxybutyrate)

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