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DSC analysis of isothermally melt-crystallized bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) films

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Abstract

The multiple melting behavior of isothermally melt-crystallized poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) from its melt was investigated using differential scanning calorimetry (DSC). PHBHHx exhibits a fourfold endothermic melting phenomenon, which were expressed as A, I, II, and III from low to high temperature, and attributed to the melting of secondary lamellae formed at room temperature, the melting of secondary lamellae at crystallization temperature, the melting of primary lamellae, and the melting of the recrystallized lamellae of different stabilities, respectively. Secondary crystallization is much slower than the primary crystallization and needs a relatively long period of time to occur. Furthermore, secondary crystallization at room temperature is heterogeneous, which depends on the presence of the primary lamellae and the secondary lamellae formation.

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Acknowledgements

The authors gratefully acknowledge the financial support of this work by the Tianjin Municipal Natural Science Foundation of China (Contract grant number: 08JCZDJC24600). We also thank Prof. S. Z. Wu for his work on the differential scanning calorimetry and helpful discussions.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin, 300160, People’s Republic of China

    Changkun Ding & Bowen Cheng

  2. Department of Biological Science and Biotechnology, Tsinghua University, Beijing, 100084, People’s Republic of China

    Qiong Wu

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  1. Changkun Ding
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  2. Bowen Cheng
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Correspondence to Bowen Cheng or Qiong Wu.

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Ding, C., Cheng, B. & Wu, Q. DSC analysis of isothermally melt-crystallized bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) films. J Therm Anal Calorim 103, 1001–1006 (2011). https://doi.org/10.1007/s10973-010-1135-8

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