Nucleating effect of montmorillonite nanoparticles in polypropylene

András Pozsgay, Tünde Fráter, László Papp, I. Sajó, B. Pukánszky

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

The nucleation effect of two layered montmorillonite silicates of different origin was studied in polypropylene (PP). Composites were prepared as a function of composition in an internal mixer or by homogenization in a twin-screw compounder. Melting and crystallization characteristics were determined by differential scanning calorimetry. The gallery distance of the silicates and the structure of the composites were studied by WAXS. The results prove that montmorillonite may considerably influence the crystallization of PP. The effect depends very much on the origin and treatment of the filler. Both treatment and composite preparation lead to considerable changes in the separation distance of the silicate layers. Even though the composites contain fillers with more than one population of layer distances, the nucleating effect is related to the completely collapsed galleries of 1 nm distance. Besides gallery distance, organophillization also modifies the surface tension of the filler, but this apparently does not influence its nucleating efficiency. The efficient gallery distance is twice as large as the characteristic matching lattice dimension determined by Lotz et al. Although a few observations could not be explained and the tentative explanation given earlier may need further verification, the results prove that nucleation does not occur at the flat surface of the filler but between its galleries, where polymer molecules may adsorb preferentially.

Original languageEnglish
Pages (from-to)1249-1265
Number of pages17
JournalJournal of Macromolecular Science - Physics
Volume41 B
Issue number4-6
DOIs
Publication statusPublished - Jul 2002

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Bentonite
Polypropylenes
Clay minerals
Silicates
Fillers
Nanoparticles
Composite materials
Crystallization
Nucleation
Surface tension
Differential scanning calorimetry
Polymers
Melting
Molecules
Chemical analysis

Keywords

  • DSC
  • Layered silicates
  • Matching lattice dimension
  • Nanocomposites
  • Nucleation
  • Polypropylene
  • WAXS

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

Cite this

Nucleating effect of montmorillonite nanoparticles in polypropylene. / Pozsgay, András; Fráter, Tünde; Papp, László; Sajó, I.; Pukánszky, B.

In: Journal of Macromolecular Science - Physics, Vol. 41 B, No. 4-6, 07.2002, p. 1249-1265.

Research output: Contribution to journalArticle

Pozsgay, András ; Fráter, Tünde ; Papp, László ; Sajó, I. ; Pukánszky, B. / Nucleating effect of montmorillonite nanoparticles in polypropylene. In: Journal of Macromolecular Science - Physics. 2002 ; Vol. 41 B, No. 4-6. pp. 1249-1265.
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