Reference : Supercritical CO2 and polycarbonate based nanocomposites: A critical issue for foaming
Scientific journals : Article
Engineering, computing & technology : Materials science & engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/171364
Supercritical CO2 and polycarbonate based nanocomposites: A critical issue for foaming
English
Monnereau, Laure [Karlsruhe (Germany), Institute of Organic Chemistry > > > >]
Urbanczyk, Laetitia [University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)]
Thomassin, Jean-Michel [University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)]
Alexandre, Michaël [University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)]
Jérôme, Christine mailto [University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)]
Huynen, Isabelle [Université Catholique de Louvain (UCL), Research Center in Micro and Nanoscopic Materials and Electronic Devices, CeRMiN, Belgium > > > >]
Bailly, Christian [Université Catholique de Louvain (UCL), Research Center in Micro and Nanoscopic Materials and Electronic Devices, CeRMiN, Belgium > > > >]
Detrembleur, Christophe mailto [University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)]
13-May-2014
Polymer
Elsevier Science
55
10
2422-2431
Yes (verified by ORBi)
International
0032-3861
Oxford
United Kingdom
[en] supercritical carbon dioxide ; carbon nanotube ; nanocomposite
[en] Supercritical carbon dioxide readily induced foaming of various polymers. In that context, supercritical CO2 was applied to carbon nanotubes based polycarbonate nanocomposites to ensure their foaming. Surprisingly, efficient foaming only occurs when low pressure is applied while at high pressure, no expansion of the samples was observed. This is related to the ability of supercritical carbon dioxide to induce crystallization of amorphous polycarbonate. Moreover, this behaviour is amplified by the presence of carbon nanotubes that act as nucleating agents for crystals birth. The thermal behaviour of the composites was analysed by DSC and DMA and was related to the foaming observations. The uniformity of the cellular structure was analysed by scanning electron microscopy (SEM). By saturating the polycarbonate nanocomposites reinforced with 1 wt% of MWNTs at 100 bar and 100 °C during 16 h, microcellular foams were generated, with a density of 0.62, a cell size ranging from 0.6 to 4 μm, and a cellular density of 4.1 × 1011 cells cm−3. The high ability of these polymeric foams to absorb electromagnetic radiation was demonstrated at low MWNT content as the result of the high affinity of the polycarbonate matrix for MWNTs, and therefore to the good MWNTs dispersion.
Center for Education and Research on Macromolecules (CERM)
The Région Wallonne in the frame of the “nanotechnology” program MULTIMASEC. ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers
http://hdl.handle.net/2268/171364
10.1016/j.polymer.2014.03.035

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