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Journal of Thermal Analysis and Calorimetry

, Volume 56, Issue 3, pp 1047–1057 | Cite as

Crystallization and Melting of β-Nucleated Isotactic Polypropylene

  • J. Varga
  • I. Mudra
  • G. W. Ehrenstein
Article

Abstract

Ca salts of suberic (Ca-Sub) and pimelic acid (Ca-Pim) were synthesized and used as β-nucleating agents in different grades of isotactic polypropylene (IPP). Propylene homo-, random- and block-copolymers containing these additives crystallize principally in pure β-modification as demonstrated in isothermal and non-isothermal crystallization experiments. Ca-Sub proved the most effective β-nucleating agent known, so far. It broadens the upper crystallization temperature range of pure β-IPP formation up to 140°C. The effect of the additives on the crystallization and melting characteristics of the polymers was studied. The degree of crystallinity of the β-modification was found to be markedly higher than that of α-IPP. High temperature melting peak broadening was first observed and discussed in literary results regarding the same phenomenon for α-IPP.

β-nucleating agent β-polypropylene crystallization degree of crystallinity melt enthalpies melting recrystallization 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • J. Varga
    • 1
  • I. Mudra
    • 1
  • G. W. Ehrenstein
    • 2
  1. 1.Department of Plastics and Rubber TechnologyTechnical University of BudapestBudapestHungary
  2. 2.Lehrstuhl für KunststofftechnikFriedrich-Alexander-Universität Erlangen-NürnbergErlangenGermany

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