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Electrical and Rheological Percolation in Polystyrene/MWCNT Nanocomposites
- Source :
- Macromolecules. 40:7400-7406
- Publication Year :
- 2007
- Publisher :
- American Chemical Society (ACS), 2007.
-
Abstract
- A systematic electrical and rheological characterization of percolation in commercial polydisperse polystyrene (PS) nanocomposites containing multiwall carbon nanotubes (MWCNTs) is presented. The MWCNTs confer appreciable electrical conductivities (up to ca. 1 S/m) to these nanocomposites at a concentration of 8 vol %. In addition to enhancing the electrical properties, even at small concentrations (ca. 2 vol %), MWCNTs significantly enhance the rheological properties of PS melts. At concentrations exceeding 2 vol %, a plateau appears in the storage modulus G‘ at low frequencies, indicating the formation of a percolated MWCNT network that responds elastically over long timescales. Network formation, in turn, implies a diverging complex viscosity vs complex modulus curve. A focus of this study is on the correlation between electrical and rheological properties at the onset of percolation. The experimental results indicate that the elastic load transfer and electrical conductivity are far more sensitive to ...
- Subjects :
- Materials science
Nanocomposite
Polymers and Plastics
Rheometry
Organic Chemistry
Concentration effect
Carbon nanotube
Dynamic mechanical analysis
law.invention
Condensed Matter::Soft Condensed Matter
Inorganic Chemistry
chemistry.chemical_compound
chemistry
Electrical resistivity and conductivity
law
Percolation
Polymer chemistry
Materials Chemistry
Polystyrene
Composite material
Subjects
Details
- ISSN :
- 15205835 and 00249297
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Macromolecules
- Accession number :
- edsair.doi...........a13f1179647a4302a30f4dbd23261a22