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Synthesis and Properties of Compact and Foamed Layered Silicate Nanocomposites Based on Polystyrene and Poly(styrene-b-butadiene-b-styrene) Triboblock Copolymer

Polymer nanocomposites and polymer nanocomposite foams are of enormous scientific and economic interest due to the potential of improving the physical and mechanical properties of the neat polymers and foams. As a result of their high aspect ratio and their outstanding intrinsic properties, nanoclays seem to be suitable as reinforcing materials.

In this work, the potential of nanoclays for improving the mechanical properties of polystyrene and polystyrene-polybutadiene-polystyrene block copolymers as well as of polystyrene foams will be presented. Especially, the influence of the degree of dispersion, the orientation of the nanoclays as well as the matrix microstructure on the resulting mechanical properties of these systems will be discussed. Therefore, the deformation and fracture behaviour of the polystyrene nanocomposites and the polystyrene-polybutadiene-polystyrene block copolymer nanocomposites will be reported in detail. The results will highlight that not only a very good dispersion of the clays into single platelets but also the intrinsic matrix deformation behaviour is crucial for improving the strength and the ductility at the same time. Particularly, as the dispersion of the clays into single platelets approaches the molecular level, completely new interactions arise at the interface, which influence the respective matrix morphology and therefore the resulting solid-state properties. In comparison to the compact polymer nanocomposites nanoclays not only influence the resulting properties of the polystyrene foam but also have significant impacts on the processing behaviour and, subsequently, on the evolution of the cellular morphology. In this work, the effect of the dispersion of the nanoclays on the morphology and the mechanical behaviour of such polystyrene nanocomposite foams will be presented. In addition, the results will show that the improved mechanical properties can be ascribed to the presence of the nanoclays in the remaining polymer volume. Moreover, the influence of the nanoclays on the subsequent foaming behaviour and expansion ratio of extruded polymer nanocomposite foams will be demonstrated.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Siljana  Lietz

Siljana Lietz
Lehrstuhl für Polymere Werkstoffe
Universität Bayreuth

Information

Free keywords: nanocomposite, clay, polystyrene, poly(styrene-b-butadiene-b-Styrene) triblock copolymer, foam
Institute / chair: Fakultät für Angewandte Naturwissenschaften der Universität Bayreuth
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Prof. Dr. rer. nat. Georg Michler
Publication year: 2011
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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