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Carbon nanofibre reinforced PEEK compounds: Correlation of microstructur and properties

Due to their specific structure carbon nanofibres (CNF) have a potentially reinforcing as well as wear improving effect. On the other hand they are small enough to fit into membranes of polymerfoams or into polymerfibres to enhance the mechanics of such fine structures. At the present time there are no investigations on CNF as a rheological additive: semi-crystalline polymers are hard to foam due to their low melt strength. Can CNF be used to allow foaming and fibre-spinning of such polymers?

The high performance polymer PEEK (polyetheretherketone) is known for its excellent property profile. It shows high strength, toughness and chemical resistance but also a high wear resistance. As a carbonfibre reinforced compound PEEK solves many issues where other polymers already fail.

The combination of PEEK and carbonnanofibres (CNF) has not yet been in the focus of scientific work. This is hard to understand do they not only promise to combine very unique properties but are also available at a similar price range. The latter makes this compound also interesting from a commercial point of view. This thesis will investigate the processing of PEEK-CNF compounds with the target of an even fibre distribution within the compound. Shear- and elongational viscosity are under investigation as well as the effect of the CNF on cristallisation kinetics of the semi crystalline PEEK. Microscopic methods such as REM, TEM, WAXS ans SAXS allows conclusions on the microstructure and thus micromechanics. It is shown that CNF can be used to increase the melt strength of PEEK to allow fibre-spinning and foaming processes of this semicristalline polymer. Finally their wear improving as well as reinforcing effect is proven. The correlation of the processing with the microstructure and finally with the resulting materials properties give a comprehensive picture to the reader to understand the fundamental behavior of PEEK-CNF compounds.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Philipp Werner

Philipp Werner
Kunststoffe und Verbundwerkstoffe
Technische Universität Hamburg-Harburg

Information

Free keywords: Nanofibre, carbonnanofibre, carbon nanofibre, Nanofiber, carbonnanofiber, carbon nanofiber, CNF, PEEK, Polyetheretherketone, Poly (etheretherketone), highperformancepolymer, high performance polymer, highperformancecompound, high performance compound, nanocomposite, nanocompound, nanoreinforcement, polymerprocessing, compounding, extrusion, injection molding, injection moulding, micromechanic, microstructure, microscopy, fibre distribution, rheology, shear rheology, shear viscosity, elongational rheology, elongational viscosity, melt fracture, rheotens, highpressure capillary rheometer, HCR, tribology, wear, fiber spinning, fibre spinning, thermal analysis, DSC, DMA, cristallization, WAXS, SAXS
Institute / chair: Technische Universität Hamburg-Harburg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Volker Altstädt (Betreuer), Prof. Dr.-Ing. Wolfgang Bauhofer, Prof. Dr.-Ing. Karl Schulte
Publication year: 2004
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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