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  • 1 School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300160, People's Republic of China
  • | 2 Department of Biological Science and Biotechnology, Tsinghua University, Beijing 100084, People's Republic of China
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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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