Journal
POLYMER
Volume 54, Issue 13, Pages 3261-3270Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2013.03.053
Keywords
Carbon nanotubes; Foams; Supercritical CO2
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Funding
- National Fund for Scientific Research, Region Wallonia, Belgian Science Policy Office in the frame of the Interuniversity Attraction Pole Program [PAI VI/27]
- ARC project Bridging
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Polymer/multi-walled carbon nanotubes (PMMA/MWNTs) nanocomposites foams are widely investigated during the last decade thanks to their potential applications as electromagnetic interferences shielding (EMI) materials. Electrical conductivity of the nanocomposite is a key parameter for these applications. In the frame of this work, we aim at establishing relationships between the foams morphology and their electrical conductivity. We therefore first design nanocomposite foams of various morphologies using supercritical carbon dioxide (scCO(2)) as physical foaming agent. The nanocomposites based on poly(methyl methacrylate) (PMMA) and different carbon nanotubes loadings are prepared by melt-mixing and foamed by scCO(2) in various conditions of pressure, temperature and soaking time. The influence of these foaming conditions on the morphology of the foams (volume expansion, pore size, cell density, cell-wall thickness) is discussed. After measuring the electrical conductivity of the foams, we establish structure/properties relationships that are essential for further optimizations of the materials for the targeted application. (C) 2013 Elsevier Ltd. All rights reserved.
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