Abstract
Short carbon fibre-reinforced polyimide composites were prepared by wet impregnating chopped short carbon fibres with PMR-type polyimide matrix resin solution followed by evaporating the solvent with strong stirring. The processing properties of the prepolymer moulding powders were investigated. The mechanical properties and thermo-oxidative stability of the fabricated composite were also studied. Experimental results demonstrate that the short fibre filled moulding powders exhibit good melt resin flowing characteristics and can be processed by a hot press moulding technique to produce small-size, complicated composite structures which are difficult to produce using continuous fibre-reinforced composite prepregs by an autoclave technique. The composites exhibit outstanding mechanical properties and excellent thermal and thermo-oxidative stabilities at temperatures as high as 320 °C.
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