Polymer-stabilized graphene dispersions at high concentrations in organic solvents for nanocomposite production

By Ahmed S. Wajid, Sriya Das, Fahmida Irin, H. S. Ahmed, John L. Shelburne, D. Parviz, Robert J. Fullerton, A. Jankowski, Ronald C Hedden, Micah J. Green. 2011

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We demonstrate a simple and effective technique for dispersing pristine (unfunctionalized) graphene at high concentrations in a wide range of organic solvents by use of a stabilizing polymer (polyvinylpyrrolidone, PVP). These polymer-stabilized graphene dispersions are shown to be highly stable and readily redispersible even after freeze-drying. This technique yields significantly higher graphene concentrations as compared to prior studies. Excellent enhancement in thermal conductivity of the fluid by addition of pristine graphene is also demonstrated. These well-dispersed pristine graphene sheets were then used as a strong and conductive nano-filler for polymer nanocomposites. PVP/graphene nanocomposites were produced via bulk polymerization of N-vinylpyrrolidone loaded with dispersed graphene, resulting in excellent load transfer and improved mechanical and electrical properties.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/bc0c47366e82dc5a54f0b01cf7d8e59247384206

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In Materials Chemistry

Citations in the corpus

Production and processing of graphene and related materials (2020, background): “Epoxy composites prepared with this functionalized graphene materials have shown better interaction to the matrix in SEM micrographs and improved mechanical behavior at very low loadings [1294, 1300, 1306, 1307].”
Ultrasonic exfoliation of graphene in water: A key parameter study (2020, background): “A few reported studies on water-based LPE still used surfactants, polymer stabilizers or some specialized ingredients as an exfoliation medium [26-35], which are considered to be necessary to disperse the graphene flakes in water.”
Graphene materials with different structures prepared from the same graphite by the Hummers and Brodie methods (2013, background): “Moreover, when large amounts of sample are demanded and the graphene materials need to have a good thermal conductivity, as in the preparation of polymer-based composites with good heat dissipation properties [19], the thermal exfoliation/reduction of graphite oxide is an excellent alternative [18].”