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Preparation and mechanical characterization of laser ablated single-walled carbon-nanotubes/polyurethane nanocomposite microbeams

Louis Laberge Lebel, Brahim Aïssa, My Ali El Khakani and Daniel Therriault

Article (2010)

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We report on the preparation of nanocomposites consisting of laser synthesized single-walled carbon nanotubes (C-SWNTs) reinforcing a polyurethane. Prior to their incorporation into the polymer matrix, the C-SWNTs were purified, and characterized by means of various techniques. The purification in nitric acid added carboxylic groups to the C-SWNTs. A procedure to properly disperse the nanomaterials in the polymer was developed involving high shear mixing using a three-roll mill and a non-covalent functionalization of the nanotubes by zinc protoporphyrin IX molecule. The incorporation of the C-SWNTs into the resin led to an increase of the viscosity and the apparition of a slight shear-thinning behavior. A further increase of the shear-thinning behavior using fumed silica particles enabled the direct-write fabrication of microbeams. Mechanical characterization revealed significant increase in both strength (by ∼64%) and modulus (by more than 15 times). These mechanical enhancements are believed to be a consequence of the successful covalent and the non-covalent functionalizations of the nanotubes.

Uncontrolled Keywords

A. Nano composites; A. Carbon nanotubes; E. Extrusion; D.Rheology; B. Mechanical properties

Subjects: 2000 Materials science and technology > 2001 Materials structure, properties and testing
2000 Materials science and technology > 2002 Materials processing/fabrication
Department: Department of Mechanical Engineering
Research Center: CREPEC - Center for Applied Research on Polymers and Composites
Funders: Fonds Québécois de la Recherche sur la Nature et les Technologies, CRSNG/NSERC
PolyPublie URL: https://publications.polymtl.ca/10379/
Journal Title: Composites Science and Technology (vol. 70, no. 3)
Publisher: Elsevier
DOI: 10.1016/j.compscitech.2009.12.004
Official URL: https://doi.org/10.1016/j.compscitech.2009.12.004
Date Deposited: 06 Jul 2022 14:30
Last Modified: 06 Apr 2024 18:41
Cite in APA 7: Laberge Lebel, L., Aïssa, B., El Khakani, M. A., & Therriault, D. (2010). Preparation and mechanical characterization of laser ablated single-walled carbon-nanotubes/polyurethane nanocomposite microbeams. Composites Science and Technology, 70(3), 518-524. https://doi.org/10.1016/j.compscitech.2009.12.004


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