Enhancing the fracture toughness of hierarchical composites through amino‒functionalised carbon nanotube webs
[EN] The introduction of carbon nanotubes (CNTs) in structuralfibre-reinforced polymers, to imbue the compositewith multifunctional properties (e.g. enhancing electrical/thermal conductivity, structural health monitoring),has received much attention in recent years. Maintaining, and preferably enhan...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/212706 |
| Acceso en línea: | http://hdl.handle.net/10261/212706 |
| Access Level: | acceso abierto |
| Palabra clave: | Carbon nanotubes Functional composites Surface treatments Fracture toughness Interface |
| Sumario: | [EN] The introduction of carbon nanotubes (CNTs) in structuralfibre-reinforced polymers, to imbue the compositewith multifunctional properties (e.g. enhancing electrical/thermal conductivity, structural health monitoring),has received much attention in recent years. Maintaining, and preferably enhancing, the structural integrity ofthe composite is imperative. Consequently, strong interfacial bonding between the CNTs and the polymer matrixis sought. If the sought multifunctionality is dependent on specific CNT alignment or orientation, achievedthrough fragile CNT assemblies, gas‒phase chemical functionalisation of the CNT assembly is a viable approachin order to chemically modify the CNT surface without damaging the CNT assembly. This study reports on thegas‒phase amino‒functionalisation of CNT webs (CNTw) and further explores its influence on thein situelec-trical conductivity. The placement of an ethylenediamine-functionalised multilayer CNTw (0.2 g m−2) betweenCF plies resulted in a 13% enhancement in the interlaminar Mode I fracture toughness, while providing anelectrical conductivity of 103Sm−1in the direction of the CNTs within the interleaved CNTw. The effectivenessof the amino‒functionalised CNTw in enhancing the mechanical properties of an epoxy composite is related toan epoxy opening reaction, as demonstrated by Differential Scanning Calorimetry (DSC). Raman and X-rayphotoelectron spectroscopies are used to confirm that gas‒phase amino‒functionalisation does not damage thegraphene-based structure and its structural dependent properties. |
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