Thermoplastic Sizing of Carbon Fibres in High Temperature Polyimide Composites |
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Authors: | S D Jenkins G T Emmerson P T McGrail R M Robinson |
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Affiliation: |
a ICI Materials, Wilton Research Centre, Middlesbrough, Cleveland, UK |
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Abstract: | Thermoplastic sizing of various carbon fibres has been evaluated as a means of controlling the microcracking resistance, transflexural strength (TFS), and thermo-oxidative stability (TOS) of PMR-15 matrix composites. Four different fibre/thermoplastic size combinations were selected for this study, based on their higher TOS than appropriate controls. Data are presented for the transverse microcrack (TVM) density/inch, and the subsequent delamination of 0,90]4s laminates induced by thermal cycling (-196 to 350°C for 20 cycles). Results for composite TFS, conditioned TFS (after heating in air at 350°C), and TOS (350°C and 316°C) are also reported. One fibre/thermoplastic size combination gave both good microcracking resistance, and significantly improved TOS, in composite when compared with current commercially-available material. |
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Keywords: | thermoplastic sizing carbon fibre PMR-15 composite microcracking thermo-oxidative stability transflexural strength delamination resistance thermal cycling fibre-matrix interface transverse microcrack density |
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