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Melting and crystallization of poly(3-hydroxybutyrate)/carbon black compounds. Effect of heating and cooling cycles on phase transition

Published online by Cambridge University Press:  30 September 2015


Renate M.R. Wellen
Affiliation:
Materials Engineering Department, Federal University of Paraíba, João Pessoa, PB 58051-900, Brazil
Eduardo L. Canedo
Affiliation:
Materials Engineering Department, Federal University of Campina Grande, PB 58429-140, Brazil; and Pernambuco Institute of Technology, Recife, PE 50740-521, Brazil
Marcelo S. Rabello
Affiliation:
Materials Engineering Department, Pernambuco Institute of Technology, Recife, PE 50740-521, Brazil
Corresponding
E-mail address:

Abstract

Compounds of poly(3-hydroxybutyrate) (PHB) and carbon black (CB) with CB content ranging between 0.5 and 10% were prepared in an internal mixer. The effect of heating and cooling rates on the crystallization and melting of PHB/CB compounds was investigated by differential scanning calorimetry (DSC), and its morphology analyzed by optical microscopy (OM). Results showed that PHB and its compounds partially crystallize from the melt during cooling and partially cold crystallize on reheating, with the amount of polymer crystallizing in each stage depending strongly on the cooling rate. Melting is usually shown in DSC scans as complex (double) peaks, which are influenced by the heating/reheating thermal cycles. The melting and cold crystallization temperatures, and the rates of phase change depend strongly on the cooling and heating rates and CB content. CB acts as a nucleating agent, promoting the melt and cold crystallization of PHB as well as increasing the number of spherulites, with a mild effect on the melting transition. Light microscopy images suggest that a secondary crystallization of PHB also occurs during storage at room temperature.


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Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Susan B. Sinnott


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