A surfactant dispersed SWCNT-polystyrene composite characterized for electrical and mechanical properties |
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| Authors: | Daniel OO Ayewah Daniel C Davis Ramanan Krishnamoorti Dimitris C Lagoudas Hung-Jue Sue Maximilian Willson |
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| Affiliation: | 1. Department of Aerospace Engineering, Texas A&M University, College Station, TX 77843, USA;2. Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77004, USA;3. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA;1. Institut de Physique et Chimie des Matériaux de Strasbourg (CNRS/Université de Strasbourg, UMR 7504), 23 rue du L?ss BP 43, F-67034 Strasbourg Cedex 2, France;2. Institut Charles Sadron (CNRS, UPR 22), 23 rue du L?ss, BP 84047, F-67034 Strasbourg Cedex 2, France;1. Materials Science and Engineering Area, University Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles, Madrid, Spain;2. Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, Universidad de Sevilla, Avda. Camino de los Descubrimientos, s/n, 41092 Sevilla, Spain;1. Department of Mechanical Engineering, United Arab Emirates University, Al Ain, United Arab Emirates;2. National Water and Energy Center, United Arab Emirates University, Al Ain 15551, United Arab Emirates;3. On leave from Mechanical Design Department, Faculty of Engineering, Helwan University, Cairo 11718, Egypt |
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| Abstract: | Single wall carbon nanotubes (SWCNTs) were dispersed in polystyrene (PS) at 0.1, 0.2, 0.3 and 1.0 wt.% (weight percent) concentrations using a surfactant assisted method. The resulting nanocomposites were characterized for their electrical conductivity, mechanical strength and fracture toughness properties. Results show a significant improvement in electrical conductivity with electrical percolation occurring by 0.2 wt.% SWCNT loading and the SWCNT-PS nanocomposite fully conductive at 1.0 wt.%. Three-point bend tests showed a decline in flexural strength and break strain with the addition of 0.1 wt.% SWCNTs. Improvements in the flexural modulus, strength and break strain with increasing SWCNT wt.% content followed The fracture toughness of the SWCNT-PS nanocomposites, in terms of the critical stress-intensity factor KIC, was reduced relative to the neat material. From optical and high resolution scanning electron microscopy the presence of the carbon nanotubes is shown to have an adverse effect on the crazing mechanism in this PS material, resulting in a deterioration of the mechanical properties that depend on this mechanism. |
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