The influence of fibre type, length and matrix-fibre interactions on the properties of carbon-fibre composites of thermoplastic matrix

Autori: O.S. Carneiro, J.M. Maia
Presentato al: Southern Europe Conference on Rheology
Anno: 1999
Volume: 1
Issue: Unico
Casa Editrice: SIR-Cuen Napoli
Lingua: English


Abstract
This work is part of a broader project aiming to assess the potentialities of submicron Vapour Grown Carbon Fibres (VGCF) as they have a low potential production cost and have not, as of yet, large scale industrial applications. The reinforcing capability of short fibres in general depends on their intrinsic mechanical properties, their aspect ratio, incorporation content, fibre/matrix interaction, processing conditions and system geometry (such as geometry of the extruder screws). It was previously shown [1] that, using a polycarbonate matrix (PC), VGCF composites could be processed using conventional technologies. However, the incorporation of these fibres resulted in poor rheological and mechanical reinforcement [1,2], which induced the selection of a new matrix, a polypropylene (PP), and the pre-treatment of the fibres.
In order to assess the real potential of VGCF, another type of carbon fibres (ex-PAN based), commercially available, was also considered. Due to their relatively high initial length, these fibres were severely shortened during extrusion. However, the screw geometry proved to have a minor influence on fibre degradation, fibre length decreasing with increasing effectiveness of the mixing capacity [3,4].
In this work the influence of fibre-matrix interactions and fibre incorporation content on the rheological properties and reinforcing capability is studied.


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