Journal of Materials Science

, Volume 37, Issue 8, pp 1561–1573

Talc as nucleating agent of polypropylene: morphology induced by lamellar particles addition and interface mineral-matrix modelization

  • E. Ferrage
  • F. Martin
  • A. Boudet
  • S. Petit
  • G. Fourty
  • F. Jouffret
  • P. Micoud
  • P. De Parseval
  • S. Salvi
  • C. Bourgerette
  • J. Ferret
  • Y. Saint-Gerard
  • S. Buratto
  • J. P. Fortune
Article

DOI: 10.1023/A:1014929121367

Cite this article as:
Ferrage, E., Martin, F., Boudet, A. et al. Journal of Materials Science (2002) 37: 1561. doi:10.1023/A:1014929121367

Abstract

The efficiency of talc used as nucleating agent (0.5% by weight) in polypropylene (PP) was determined taking into account the particle size d50, particle morphology and BET specific surface areas. These findings were compared to a mineral with similar properties, pyrophyllite. Talc samples with the finest particle sizes induce a significant increase in the starting crystallization temperature of PP and irrespective of the particle size d50, pyrophyllite was found to be less efficient than talc. X-Ray results show that PP oriented crystallization due to talc or pyrophyllite addition, corresponds to an epitaxial growth whereby the mineral c*-axis is merged with the PP b*-axis. Microscopic observations revealed that in the presence of talc, nuclei density of PP increased strongly. In addition, a large number of nuclei was observed to appear everywhere on the talc surface. A PP-talc interface model is proposed by matching the (001) talc plane and the (010) PP plane. In this model, 3% of PP cell accommodation on talc is necessary with a 15° angle between PP chains elongation and the crystallographic directions of talc. Hexagonal rings on talc surface are believed to represent hydrogen bonds with PP methyl groupings. This fine structure relation between talc and PP is discussed, and is used to characterize the differences observed between the efficiency of talc and that of pyrophyllite.

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • E. Ferrage
    • 1
  • F. Martin
    • 1
  • A. Boudet
    • 2
  • S. Petit
    • 3
  • G. Fourty
    • 4
  • F. Jouffret
    • 4
  • P. Micoud
    • 1
  • P. De Parseval
    • 1
  • S. Salvi
    • 1
  • C. Bourgerette
    • 2
  • J. Ferret
    • 4
  • Y. Saint-Gerard
    • 4
  • S. Buratto
    • 4
  • J. P. Fortune
    • 1
  1. 1.Equipe Géomarg, UMR 5563 du CNRS, LMTGUniversité Paul SabatierToulouseFrance
  2. 2.Centre d'Elaboration des Matériaux et d'Etudes Structurales CEMES, CNRSToulouse Cedex 4France
  3. 3.UMR 6532 du CNRS, Laboratoire ‘Hydr'A.S.A.’Université de PoitiersPoitiers CedexFrance
  4. 4.Talc de Luzenac S. A.Toulouse CedexFrance

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