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Abstract / Description of output
The increased interest in carbon fibre/poly(etherketoneketone) (CF/PEKK) as an option for high-performance applications calls for a thorough understanding of the composite's crystallisation behaviour, due to the essential role that crystallinity plays in performance. In this study, differential scanning calorimetry was used with a variety of thermal cycles to evaluate the effect of thermal history on crystallinity development in unreinforced PEKK and CF/PEKK. Different isothermal holding temperatures during cooling affected the ratio between primary and secondary crystallisation, and non-isothermal cooling cycles influenced the extent of crystallisation. The inclusion of carbon fibres increased the proportion of secondary crystallisation in the matrix and slowed down crystallisation kinetics. A Velisaris-Seferis model was used to model crystallisation kinetics for the isothermal data, and adapted Nakamura models were used for the non-isothermal data. Based on this work, optimum isothermal hold temperatures during cooling for CF/PEKK are estimated to lie in the range of 220-260°C.
Original language | English |
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Article number | 106992 |
Journal | Composites Part A: Applied Science and Manufacturing |
Volume | 159 |
Early online date | 11 May 2022 |
DOIs | |
Publication status | Published - Aug 2022 |
Keywords / Materials (for Non-textual outputs)
- Polymer-matrix composites (PMCs)
- Thermoplastic resin
- Microstructures
- Thermal properties
- CF/PEKK composites
- Crystallinity
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