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

Louis Laberge Lebel, Brahim Aissa, My Ali El Khakani, Daniel Therriault

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31 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)518-524
Number of pages7
JournalComposites Science and Technology
Volume70
Issue number3
DOIs
Publication statusPublished - Mar 2010
Externally publishedYes

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Keywords

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

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

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