Micromechanical deformation processes in PA/layered silicate nanocomposites: Correlation of structure and properties

Károly Renner, Sven Henning, J. Móczó, Min Soo Yang, Hyoung Jin Choi, B. Pukánszky

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Polyamide/organophilic montmorillonite nanocomposites were prepared from two silicates with different organophilization resulting in strong and weak matrix/silicate adhesion, respectively; uncoated sodium montmorillonite was used as reference. The silicate content of the composites changed between 0 and 10 vol% in seven steps. Composite structure was characterized by X-ray diffraction and electron microscopy. Micromechanical deformation processes were followed by acoustic emission and volume strain measurements. The structure of the composites is more complicated than usually claimed; they contain individual silicate platelets, tactoids with different degree of intercalation, and larger particles. Elastic deformation and shear yielding dominates during the elongation of the specimens. The matrix polymer and the composites deform according to different mechanisms. Sound is emitted by cavitation in the former, while sound emitting processes are related tactoids and nonexfoliated particles in the composites. Acoustic events are generated mainly by the fracture of the particles. Matrix/silicate adhesion seems to be strong, debonding rarely takes place, and volume increase is initiated primarily by particle failure. The type and amount of the surfactant used for organophilization plays an important role in the determination of deformation processes and properties, since it influences both matrix/filler interaction and the inherent strength of the particles.

Original languageEnglish
Pages (from-to)1235-1245
Number of pages11
JournalPolymer Engineering and Science
Volume47
Issue number8
DOIs
Publication statusPublished - Aug 2007

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Silicates
Nanocomposites
Bentonite
Composite materials
Clay minerals
Adhesion
Acoustic waves
Volume measurement
Strain measurement
Nylons
Debonding
Elastic deformation
Intercalation
Acoustic emissions
Platelets
Composite structures
Polymer matrix
Polyamides
Cavitation
Surface-Active Agents

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Micromechanical deformation processes in PA/layered silicate nanocomposites : Correlation of structure and properties. / Renner, Károly; Henning, Sven; Móczó, J.; Yang, Min Soo; Choi, Hyoung Jin; Pukánszky, B.

In: Polymer Engineering and Science, Vol. 47, No. 8, 08.2007, p. 1235-1245.

Research output: Contribution to journalArticle

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