Miscibility and crystallization behaviors of poly(3-hydroxybutyrate-co-11%- 4-hydroxybutyrate)/Poly(3-hydroxybutyrate-co-33%-4-hydroxybutyrate) blends

Zhiyuan Lan, Jueyu Pan, Xiaojuan Wang, Jianyun He, Kaitian Xu

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5 Scopus citations


Biopolyesters poly(3-hydroxybutyrate-co-4-hydroxybutyrate) with an 11 mol % 4HB content [P(3HB-co-11%-4HB)] and a 33 mol % 4HB content [P(3HB-co-33%-4HB)] were blended by a solvent-casting method. The thermal properties were investigated with differential scanning calorimetry. The single glass-transition temperature of the blends revealed that the two components were miscible when the content of P(3HB-co-33%-4HB) was less than 30% or more than 70 wt %. The blends, however, were immiscible when the P(3HB-co-33%-4HB) content was between 30 and 70%. The miscibility of the blends was also confirmed by scanning electron microscopy morphology observation. In the crystallite structure study, X-ray diffraction patterns demonstrated that the crystallites of the blends were mainly from poly(3-hydroxybutyrate) units. With the addition of P(3HB-co-33%-4HB), larger crystallites with lower crystallization degrees were induced. Isothermal crystallization was used to analyze the melting crystallization kinetics. The Avrami exponent was kept around 2; this indicated that the crystallization mode was not affected by the blending. The equilibrium melting temperature decreased from 144 to 140°C for the 80/20 and 70/30 blends P(3HB-co-11%-4HB)/P(3HB-co-33%-4HB). This hinted that the crystallization tendency decreased with a higher P(3HB-co-33%-4HB) content.

Original languageEnglish (US)
Pages (from-to)3467-3475
Number of pages9
JournalJournal of Applied Polymer Science
Issue number6
StatePublished - Mar 15 2011

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry


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