Melting and crystallization of poly(3-hydroxybutyrate)/carbon black compounds. Effect of heating and cooling cycles on phase transition

摘要: Compounds of poly(3-hydroxybutyrate) (PHB) and carbon black (CB) with CB content ranging between 0.5 10% were prepared in an internal mixer. The effect heating cooling rates on the crystallization melting PHB/CB compounds was investigated by differential scanning calorimetry (DSC), its morphology analyzed optical microscopy (OM). Results showed that PHB partially crystallize from melt during cold reheating, amount polymer crystallizing each stage depending strongly rate. Melting is usually shown DSC scans as complex (double) peaks, which are influenced heating/reheating thermal cycles. temperatures, phase change depend content. acts a nucleating agent, promoting well increasing number spherulites, mild transition. Light images suggest secondary also occurs storage at room temperature.