Isothermal crystallization of poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Shuwen Peng, Yuxian An, Cheng Chen, Bin Fei, Yugang Zhuang, Lisong Dong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)


Isothermal crystallization behavior of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was investigated by means of differential scanning calorimetry and polarized optical microscopy (POM). The Avrami analysis can be used successfully to describe the isothermal crystallization kinetics of PHBV, which indicates that the Avrami exponent n = 3 is good for all the temperatures investigated. The spherulitic growth rate, G, was determined by POM. The result shows that the G has a maximum value at about 353 K. Using the equilibrium melting temperature (448 K) determined by the Flory equation for melting point depression together with U* = 1500 calmol-1, T∞= 30 K and Tg= 278 K, the nucleation parameter Kgwas determined, which was found to be 3.14 ± 0.07 × 105(K2), lower than that for pure PHB. The surface-free energy σ = 2.55 × 10-2Jm-2and σe= 2.70±0.06 × 10-2Jm-2were estimated and the work of chain-folding (q=12.5 ± 0.2 kJmol-1) was derived from σe, and found to be lower than that for PHB. This implies that the chains of PHBV are more flexible than that of PHB.
Original languageEnglish
Pages (from-to)1475-1480
Number of pages6
JournalEuropean Polymer Journal
Issue number7
Publication statusPublished - 1 Jul 2003
Externally publishedYes


  • Isothermal crystallization
  • Kinetics
  • Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Polymers and Plastics
  • Organic Chemistry


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