Abstract
Surface treatment bath conductivity (8 and 16 µS/cm) and sizings (epoxy compatible and polyamide compatible) were altered for the production of carbon fibers. Four sets of fibers were fed into a twin-screw extruder as continuous fibers and incorporated into PA6. The manufactured composite filament was pelletised (2 mm) composed of short fibers (typically ≤400 µm) and 13.5 wt% carbon fiber. The pellets were hot pressed into a plate from which tensile and flexural test bars were obtained. Determination of the tensile properties showed that the best performing set were the epoxy sized fibers surface treated at low conductivity, while tensile strength was unaffected by either sizing or surface treatment. The flexural modulus and strength was significantly improved for both polyamide and epoxy sized fibers surface treated at low conductivity. This process is an operationally simple means of generating high quality thermoplastic composites for interrogation of surface treatment and sizing effects.
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