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J., Hank T.
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document
Interlaminar Reinforcement of High Glass Transition Temperature Laminated Composites Via Vertically Aligned Carbon Nanotubes
Abstract
Interest has been growing in the development and use of composite laminates based on polymer matrices with glass transition temperatures (Tg) beyond traditional epoxies, which are more suitable for high-temperature applications, such as propulsion components. However, these high-Tg composites generally present relatively poor interlaminar strength and toughness and are, therefore, prone to delamination. Here, a strategic reinforcement of the interlaminar region in high Tg (375ºC) carbon fibre reinforced polyimide (CFRP) unidirectional-ply laminates is investigated. We show for the first time that vertically aligned carbon nanotubes (VA-CNT) can be used to reinforce the interlaminar region of polyimide-based CFRP laminates to delay delamination initiation. A 20 µm VA-CNT morphology (termed nanostitch) is investigated resulting in statistically significant improvements of 7% on the static interlaminar shear strength. These results provide a strong foundation for continued research to mature and scale the technique so that it can be applied to real composite propulsion components such as stator vanes and fan ducts.