Melt and cold crystallization in a poly(3-hydroxybutyrate) poly(butylene adipate-co-terephthalate) blend

  • Anna Raffaela de Matos CostaEmail author
  • Raquel Marques Santos
  • Edson Noriyuki Ito
  • Laura Hecker de Carvalho
  • Eduardo Luís Canedo


Melt and cold crystallization characteristics of poly(3-hydroxybutyrate) (PHB) and poly(butylene adipate-co-terephthalate) (PBAT), two biodegradable polyesters of current industrial interest, as well as a PHB/PBAT blend, were investigated by nonisothermal tests of differential scanning calorimetry over a range of cooling/heating rates ranging between 2 and 64 °C min−1. Although more difficult to study the crystallization under isothermal conditions, the quantitative evaluation of nonisothermal crystallization is required to understand and model industrial processes, which are conducted under nonisothermal conditions. While PBAT crystallizes completely during cooling, PHB and the PHB/PBAT blend show incomplete crystallization from the melt, the process being completed during the reheating stage. Notwithstanding the different crystallization behavior, crystallinity levels and melting points of PHB, PBAT and the blend have virtually identical melt crystallization temperatures, due perhaps to differences in the nucleating efficiency of the stereoregular homopolymer PHB and the random copolymer PBAT. These findings may be of enough interest for process engineers designing and controlling operations.


Polymer blends and alloys Biodegradable polymers Thermal properties PHB PBAT 



The authors wish to thank PHB Industrial (Serrana SP, Brazil) for supplying PHB free of charge and the Conselho Nacional de de Pesquisa (CNPq) e Coordenação de Aperfeiçoamento de Pessoal Superior (CAPES), Brazil for financial support.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Anna Raffaela de Matos Costa
    • 1
    Email author
  • Raquel Marques Santos
    • 2
  • Edson Noriyuki Ito
    • 3
  • Laura Hecker de Carvalho
    • 4
  • Eduardo Luís Canedo
    • 4
  1. 1.Programa de Pós-Graduação em Ciência e Engenharia de MateriaisUniversidade Federal de Rio Grande do NorteNatalBrazil
  2. 2.Programa de Pós-Graduação em Engenharia de ProcessosUniversidade Federal de Campina GrandeCampina GrandeBrazil
  3. 3.Departamento de Engenharia de MateriaisUniversidade Federal de Rio Grande do NorteNatalBrazil
  4. 4.Departamento de Engenharia de MateriaisUniversidade Federal de Campina GrandeCampina GrandeBrazil

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