On the manufacturing and electrical and mechanical properties of ultra-high wt.% fraction aligned MWCNT and randomly oriented CNT epoxy composites |
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| Affiliation: | 1. Hamburg University of Technology, Institute of Polymers and Composites, Denickestraße 15, 21073 Hamburg, Germany;2. Hamburg University of Technology, Institute of Optical and Electronic Materials, Eißendorfer Straße 38, 21073 Hamburg, Germany;3. Tokyo Institute of Technology, Department of Mechanical Science and Engineering, 2-12-3l-6, Ookayama, Meguro-ku 152-8552, Japan;1. Department of Chemistry, College of Science, Shanghai University, Shanghai, 200444, China;2. Division of Advanced Nano-Materials, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China;3. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China;4. Department of Physics, College of Science, Shanghai University, Shanghai, 200444, China;1. University of A Coruña, EPS, Avda. Mendizábal s/n, 15403, Ferrol, Spain;2. TA Instruments-Waters Cromatografía, Ronda Can Fatjó, Cerdanyola del Vallés, 08290, Spain |
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| Abstract: | The effect of CNT orientation on electrical and mechanical properties is presented on the example of an ultra-high filler loaded multi-walled carbon nanotube (68 wt.% MWCNTs) epoxy-based nanocomposite. A novel manufacturing method based on hot-press infiltration through a semi-permeable membrane allows to obtain both, nanocomposites with aligned and randomly oriented CNTs (APNCs and RPNCs) over a broad filler loading range of ≈10–68 wt.%. APNCs are based on low-defected, mm-long aligned MWCNT arrays grown in chemical vapour deposition (CVD) process. Electrical conductivity and mechanical properties were measured parallel and perpendicular to the direction of CNTs. RPNCs are based on both, aligned mm-long MWCNTs and randomly oriented commercial μm-long and entangled MWCNTs (Baytube C150P, and exemplarily Arkema Graphistrength C100). The piezoresistive strain sensing capability of these high-wt.% APNCs and RPNCs had been investigated towards the influence of CNT orientations. For the highest CNT fraction of 68 wt.% of unidirectional aligned CNTs a Young’s modulus of E|| ≈ 36 GPa and maximum electrical conductivity of σ|| ≈ 37·104 S/m were achieved. |
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