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

Alfréd Menyhárd, Gábor Dora, Zsuzsanna Horváth, Gábor Faludi, József Varga

Research output: Contribution to journalArticle

41 Citations (Scopus)

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 a-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.

Original languageEnglish
Pages (from-to)613-620
Number of pages8
JournalJournal of Thermal Analysis and Calorimetry
Volume108
Issue number2
DOIs
Publication statusPublished - May 1 2012

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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