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Journal of Thermal Analysis and Calorimetry

, Volume 108, Issue 2, pp 613–620 | Cite as

Kinetics of competitive crystallization of β- and α-modifications in β-nucleated iPP studied by isothermal stepwise crystallization technique

  • Alfréd MenyhárdEmail author
  • Gábor Dora
  • Zsuzsanna Horváth
  • Gábor Faludi
  • József Varga
Article

Abstract

Crystallization kinetics of β-nucleated isotactic polypropylene (β-iPP) under isothermal conditions were investigated by differential scanning calorimetry. iPP was nucleated by a trisamide derivative, namely tris-2,3-dimethyl-hexylamide of trimesic acid (TATA). In the presence of TATA possessing dual nucleating ability, the formation of the α- and β-form occurs simultaneously. An isothermal stepwise crystallization method is suggested in this study, which can separate the crystallization process of β- and α-iPP and consequently their crystallization kinetics can be evaluated separately. The results indicated that the mechanism of crystallization changes in temperature especially in the vicinity of the upper critical temperature of the formation of the β-phase. In addition, it was found that the ratio of the growth rates of β- and α-modification determines the characteristics of crystallization and influences the apparent rate constant of crystallization of both polymorphs.

Keywords

Crystallization kinetics Avrami method Mixed polymorphic composition α- and β-iPP Isothermal stepwise crystallization (ISC) technique 

Notes

Acknowledgements

One of the authors (Alfréd Menyhárd) would like to express his indebtedness to the János Bolyai Research Scholarship of the Hungarian Academy of Sciences for the financial support.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  • Alfréd Menyhárd
    • 1
    • 2
    Email author
  • Gábor Dora
    • 1
    • 2
  • Zsuzsanna Horváth
    • 1
    • 2
  • Gábor Faludi
    • 1
    • 2
  • József Varga
    • 1
    • 2
  1. 1.Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials ScienceBudapest University of Technology and EconomicsBudapestHungary
  2. 2.Hungarian Academy of Sciences, Chemical Research CentreInstitute of Environmental and Material ChemistryBudapestHungary

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