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Influence of mechanical dispersion processes on structure and properties of thermosetting nanocomposites

This work focuses on the fundamental investigation of procedures concerning the mechanical dispersion of agglomerated nanoparticles in epoxy resin and the physical characterization of the resulting nanocomposites.

Therefore, dispersion experiments by the use of titanium dioxide nanopowder were carried out by means of a horizontal and a vertical stirred bead mill through systematical variation of dispersion parameters, for instance the circumferential velocity of the agitator, the dispersion time, the specific energy input, the diameter of the grinding media and the filling degree of grinding media. The challenge lies in the achievement of a preferably low particle size in combination with a homogeneous distribution of the primary particles in the polymer matrix, without the degradation of the molecular structure of the applied epoxy resin.

For the determination of the influence of the different dispersion parameters on the particle sizes and their frequency distribution samples of the suspension consisting of epoxy resin and TiO2-nanoparticles were removed during the dispersion process and examined according to the principle of dynamic light scattering.

The suspensions were processed to nanocomposites which were characterized substantially by mechanical, thermoanalytical and scanning electron microscope analysis in order to investigate the influence of the particle size and the particle frequency distribution on the structure and the properties of the nanocomposites.

The developed proceeding was applied in the following to disperse nanoparticle powders consisting of titanium dioxide, aluminium oxide, and zirconium dioxide in epoxy resin in order to manufacture nanocomposites with enhanced material’s properties. These were undergone mechanical and scanning electron microscope analysis.

Based on the knowledge obtained by the previous dispersion experiments and theoretical considerations the prediction of achievable particle size distributions in dependance on physical determining factors of the dispersion process was proved by means of a dispersion model.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Markus Englert

Markus Englert
Lehrstuhl für Verbundwerkstoffe
Technische Universität Kaiserslautern

Information

Free keywords: Nanocomposite, agglomerate, dispersion, modelling
Institute / chair: Technische Universität Kaiserslautern
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Alois Schlarb (Betreuer), Prof. Dr.-Ing. Dr. h.c. mult. Klaus Friedrich
Publication year: 2009
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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