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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 ,
Eduardo L. Canedo  and
Marcelo S. Rabello
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
*
a)Address all correspondence to this author. e-mail: wellen.renate@gmail.com
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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.

Keywords

PHBcarbon blackcrystallizationmeltingDSCoptical microscopy
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 21 , 13 November 2015 , pp. 3211 - 3226
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Susan B. Sinnott

References

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