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Gelation, Electrical Conductivity and Elasticity of PAM- MWNT

Published online by Cambridge University Press:  28 January 2011

Gulsen A. Evingur  and
Önder Pekcan
Gulsen A. Evingur
Affiliation:
İstanbul Technical University, 34469, Maslak, İstanbul, TURKEY
Önder Pekcan
Affiliation:
Kadir Has University, 34320, Cibali, İstanbul, TURKEY
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Abstract

Polyacrylamide- Multiwalled carbonnanotube (PAM- MWNT) composites were prepared via free radical crosslinking copolymerization with different amounts of MWNT varying in the range between 0.1 and 15 wt. %. PAM- MWNT composite gels were characterized by fluorescence, dielectric spectroscopy and the tensile testing technique. A small content of doped nanotubes dramatically changed gelation time, conductivity and young modulus, respectively. The gel fraction exponent, β of PAM- MWNT composite gels were measured for various monomer and MWNT concentrations and observed that the gel fraction exponent β agrees best with the percolation theory for various amounts of PAM- MWNT. These polymer systems which are initially of an isolator character are doped with carbon nanotubes of nano dimensions and when the amount of this addition exceeds a critical value (0.3 wt. % MWNT) known as the percolation threshold, then composite gel systems with carbon nanotubes become electrically conducting structures with a critical exponent around r=2 which is close to the theoretical prediction of this value in 3D percolated system as known random resistor network. The observed elasticities are decreased above 3 wt. %MWNT with critical exponent around y=0.72 which is indicative of a transition from liquid-like to solid-like viscoelastic behavior.

Keywords

compositeelastic propertiespolymerization
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1312: Symposium HH/II/JJ – Polymer-Based Materials and Composites—Synthesis, Assembly and Applications , 2011 , mrsf10-1312-ii08-03
Copyright
Copyright © Materials Research Society 2011

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