Preparation and mechanical characterization of laser ablated single-walled carbon-nanotubes/polyurethane nanocomposite microbeams |
| |
Authors: | Louis Laberge Lebel Brahim Aissa My Ali El Khakani Daniel Therriault |
| |
Affiliation: | 1. Center for Applied Research on Polymers and Composites (CREPEC), Mechanical Engineering Department, École Polytechnique of Montréal, C.P. 6079, Succ. Centre-Ville, Montreal (Qc), Canada H3C 3A7;2. Institut National de la Recherche Scientifique, INRS-Énergie, Matériaux et Télécommunications, 1650 Blvd. Lionel-Boulet, Varennes (Qc), Canada J3X 1S2 |
| |
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. |
| |
Keywords: | A. Nano composites A. Carbon nanotubes E. Extrusion D. Rheology B. Mechanical properties |
本文献已被 ScienceDirect 等数据库收录! |
|