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Micro- and nanostructured polymer blends – Processing, properties and foaming behaviour

Tailoring the structure of polymers - from macro over micro to nano - allows to deriving materials with superior or even novel properties. In this regard, polymeric systems such as blends and foams are promising candidates, as nano-effects potentially offer significant enhancements in toughness, strength as well as thermal insulation behaviour.

In order to verify the approach, the present thesis focuses on developing micro- and nanostructured polymer blends via melt-processing, in order to exploit their multiphase characteristics for establishing blends with enhanced solid-state properties and for deriving novel cellular materials.

Based on immiscible blend systems, nanostructure formation was initiated via melt-compatibilisation with triblock terpolymers, while selective blending was used for adjusting the microstructure. Combining both concepts allowed to controlling the morphology over several length scales and the access to excellent properties, in particular regarding the toughness and the thermal stability.

Foaming of such multiphase blends provides novel chances to tailoring cellular materials, e.g. allowing high cell densities and nanostructured cell walls. Using carbon dioxide as a blowing agent, the main parameters on the foaming behaviour of such blends, including the influence of compatibilisation and selective blending, are therefore systematically analysed. The resulting fundamental relationships are not only valid for this particular blend system, but can help to elucidate the foaming behaviour of micro- and nanostructured, multiphase polymer blends in general and provide guidelines for an appropriate material selection.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Holger Ruckdäschel

Holger Ruckdäschel
Lehrstuhl für Polymere Werkstoffe
Universität Bayreuth

Information

Free keywords: Blend, Foam, Toughening, Block copolymers, Compatibilisation, Structure-property relationship, Structure-processing relationship, Multiphase materials, Nanostructured blends, Rheology, Fracture mechanics
Institute / chair: Fakultät für Angewandte Naturwissenschaften der Universität Bayreuth
Language: English
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Prof. Dr. Axel Müller
Publication year: 2008
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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