Showing results 41 to 60 of 66
  Foamed nanocomposites for EMI shielding applications; ; et al in Mukherjee, Moumita (Ed.) Advanced Microwave and Milimeter Wave Technologies Semiconductor Devices Circuits and Systems (2010) Detailed reference viewed: 15 (1 ULg)Functionalized polypropylenes as efficient dispersing agents for carbon nanotubes in a polypropylene matrix; application to electromagnetic interference (EMI) absorber materialsThomassin, Jean-Michel  ; ; Jérôme, Robert et alin Polymer (2010), 51 Carbon nanotubes (CNTs) have been dispersed within polypropylene with the purpose to prepare electromagnetic interference (EMI) absorbers. In order to limit the reflectivity of the electromagnetic waves ... [more ▼] Carbon nanotubes (CNTs) have been dispersed within polypropylene with the purpose to prepare electromagnetic interference (EMI) absorbers. In order to limit the reflectivity of the electromagnetic waves at the interface of the materials while achieving good absorbing properties, the CNTs concentration must be kept low (<3 wt%) which means that a perfect dispersion must be ensured. Since CNTs do not disperse well within apolar polymer matrices such as polypropylene, two compatibilizers bearing aromatic moieties, i.e. pyrene and pyridine, able to develop π-π interactions with the CNTs have been synthesized starting from polypropylene grafted by maleic anhydride (PP-g-MA). A masterbatch is first prepared by dispersion of CNTs within the compatibilizers by melt-mixing and coprecipitation followed by further dispersion within the PP matrix. Rheological and electromagnetic characterizations of the nanocomposites have demonstrated the efficiency of these compatibilizers to promote the dispersion of CNTs in PP and the good EMI shielding effectiveness of the PP matrix at a low CNTs concentration (2 wt%). [less ▲] Detailed reference viewed: 62 (7 ULg)Polymer/carbon nanotube composites for electromagnetic interference réductionThomassin, Jean-Michel ; Jérôme, Robert ; Detrembleur, Christophe et alin Tjong, S. C.; Mai, Y.-W. (Eds.) Physical properties and applications of polymer nanocomposites (2010) Detailed reference viewed: 14 (7 ULg)Functionalized polypropylenes as efficient dispersing agents for carbon nanotubes in a polypropylene matrix; application to electromagnetic interference (EMI) absorber materialsThomassin, Jean-Michel ; Detrembleur, Christophe ; et alPoster (2009, December 14) Detailed reference viewed: 26 (8 ULg)Foams of polyurethane/MWNT nanocomposites for efficient EMI reduction; Urbanczyk, Laetitia ; Thomassin, Jean-Michel et alPoster (2009, September 16) Detailed reference viewed: 45 (11 ULg)Use of supercritical fluid technology to prepare efficient nanocomposite foams for environmental protection purposeThomassin, Jean-Michel ; Urbanczyk, Laetitia ; et alConference (2009, September 16) Detailed reference viewed: 33 (5 ULg)Polymer composite material structures comprising carbon based conductive loadsJérôme, Robert ; ; Detrembleur, Christophe et alPatent (2009) The present invention provides a polymer composite material structure comprising at least one layer of a foamed polymer composite material comprising a foamed polymer matrix and 0.1 wt% to 6 wt% carbon ... [more ▼] The present invention provides a polymer composite material structure comprising at least one layer of a foamed polymer composite material comprising a foamed polymer matrix and 0.1 wt% to 6 wt% carbon based conductive loads, such as e.g. carbon nanotubes, dispersed in the foamed polymer matrix. The polymer composite material structure according to embodiments of the present invention shows good shielding and absorbing properties notwithstanding the low amount of carbon based conductive loads. The present invention furthermore provides a method for forming a polymer composite material structure comprising carbon based conductive loads. [less ▲] Detailed reference viewed: 8 (2 ULg)Use of scCO2 for the preparation of polymer/carbon nanotube foams that are effective protective materials against electromagnetic pollutionThomassin, Jean-Michel ; Urbanczyk, Laetitia ; Alexandre, Michaël et alConference (2009, May 20) Detailed reference viewed: 23 (9 ULg)Use of the supercritical fluid technology to prepare efficient nanocomposite foams for environmental protection purposeUrbanczyk, Laetitia ; Thomassin, Jean-Michel ; et alConference (2009, May 19) This work reports on the preparation of novel nanocomposite foams that are efficient broadband microwave absorbers. Carbon nanotubes are first successfully dispersed into PCL and PMMA by melt blending ... [more ▼] This work reports on the preparation of novel nanocomposite foams that are efficient broadband microwave absorbers. Carbon nanotubes are first successfully dispersed into PCL and PMMA by melt blending. Then, foaming is promoted by supercritical CO2 by depressurization. Regular cellular structures are obtained in both cases with cells size around 10-50µm. The electromagnetic interference (EMI) shielding efficiency of these materials are then evaluated and compared to the non-foamed nanocomposites. [less ▲] Detailed reference viewed: 44 (6 ULg)Foams of polymer/MWNT nanocomposites for efficient electromagnetic interferences (EMI) reductionThomassin, Jean-Michel ; Detrembleur, Christophe ; et alPoster (2009, May 14) Detailed reference viewed: 26 (5 ULg)Foams of polycaprolactone/MWNT nanocomposites for efficient EMI shieldingThomassin, Jean-Michel ; ; et alConference (2008, September 09) Detailed reference viewed: 12 (2 ULg)Polymer composite material structures comprising carbon based conductive loadsJérôme, Robert ; ; Detrembleur, Christophe et alPatent (2008) The present invention provides a polymer composite material structure comprising at least one layer of a foamed polymer composite material comprising a foamed polymer matrix and 0.1 wt% to 6 wt% carbon ... [more ▼] The present invention provides a polymer composite material structure comprising at least one layer of a foamed polymer composite material comprising a foamed polymer matrix and 0.1 wt% to 6 wt% carbon based conductive loads, such as e.g. carbon nanotubes, dispersed in the foamed polymer matrix. The polymer composite material structure according to embodiments of the present invention shows good shielding and absorbing properties notwithstanding the low amount of carbon based conductive loads. The present invention furthermore provides a method for forming a polymer composite material structure comprising carbon based conductive loads. [less ▲] Detailed reference viewed: 7 (2 ULg)Polymer composite material structures comprising carbon based conductive loadsJérôme, Robert ; ; Detrembleur, Christophe et alPatent (2008) The present invention provides a polymer composite material structure comprising at least one layer of a foamed polymer composite material comprising a foamed polymer matrix and 0.1 to 6 wt% carbon based ... [more ▼] The present invention provides a polymer composite material structure comprising at least one layer of a foamed polymer composite material comprising a foamed polymer matrix and 0.1 to 6 wt% carbon based conductive loads, such as e.g. carbon nanotubes, dispersed in the foamed polymer matrix. The polymer composite material structure according to embodiments of the present invention shows good shielding and absorbing properties notwithstanding the low amount of carbon based conductive loads. The present invention furthermore provides a method for forming a polymer composite material structure comprising carbon based conductive loads. [less ▲] Detailed reference viewed: 11 (2 ULg)Dispersion of platinum modified carbon nanotubes within fuel cell membranesThomassin, Jean-Michel ; Caldarella, Giuseppe ; Germain, Albert et alPoster (2008, May 22) Detailed reference viewed: 11 (4 ULg)Foams of polycaprolactone/MWNT nanocomposites for efficient EMI reductionThomassin, Jean-Michel ; ; et alin Journal of Materials Chemistry (2008), 18(7), 792-796 Nanocomposites of polycaprolactone (PCL) filled with multi-walled carbon nanotubes (MWNTs) were foamed by supercritical CO2 in order to prepare materials with reduced electromagnetic interference (EMI ... [more ▼] Nanocomposites of polycaprolactone (PCL) filled with multi-walled carbon nanotubes (MWNTs) were foamed by supercritical CO2 in order to prepare materials with reduced electromagnetic interference (EMI). Two mixing techniques were used, i.e., melt blending and co-precipitation. Shielding efficiency as high as 60 to 80 dB together with a low reflectivity was observed at a very low vol% of MWNTs (0.25 vol%). The reflectivity of the nanocomposites was advantageously decreased upon foaming. The uniformity of the open-cell structure was assessed by scanning electron microscopy. These foamed PCL/MWNT nanocomposites are very promising EMI shielding materials because their performances result from absorption at low filler content and not from reflection at relatively high filler content as was previously the case. [less ▲] Detailed reference viewed: 110 (9 ULg)Beneficial effect of carbon nanotubes on the performances of Nafion membranes in fuel cell applicationsThomassin, Jean-Michel ; ; Caldarella, Giuseppe et alin Journal of Membrane Science (2007), 303(1-2), 252-257 Multi-walled carbon nanotubes (MWCNTs) were dispersed by melt-extrusion within Nafion(R) membranes in order to decrease the methanol permeability without deleterious effect on the ionic conductivity. The ... [more ▼] Multi-walled carbon nanotubes (MWCNTs) were dispersed by melt-extrusion within Nafion(R) membranes in order to decrease the methanol permeability without deleterious effect on the ionic conductivity. The risk of short-circuits was minimized by keeping the carbon nanotubes content lower than the percolation threshold. Two series of carbon nanotubes grafted by carboxylic acid groups were used, i.e., commercially available carbon nanotubes and MWCNTs home-grafted by carboxylic acid containing alkyl radicals. The second series of nanotubes were more resistant to break-up during melt-processing. Methanol permeability was decreased by approximately 60% without any decrease in the ionic conductivity. In parallel, the Young's modulus was increased by 140% and 160% as compared to pure Nafion(R) at MWCNT contents of 1 and 2 wt%, respectively. [less ▲] Detailed reference viewed: 29 (4 ULg)Polymer/carbon nanotubes nanocompositesThomassin, Jean-Michel ; Caldarella, Giuseppe ; Germain, Albert et alPoster (2007, August 31) Detailed reference viewed: 16 (2 ULg)Foams of polycaprolactone/MWNT nanocomposites for efficient EMI shieldingThomassin, Jean-Michel ; ; Caldarella, Giuseppe et alConference (2007, August 27) Detailed reference viewed: 10 (1 ULg) Multiwalled carbon nanotube/poly(epsilon-caprolactone) nanocomposites with exceptional electromagnetic interference shielding propertiesThomassin, Jean-Michel ; ; et alin Journal of Physical Chemistry C (2007), 111(30), 11186-11192 Multiwalled carbon nanotubes (MWNTs) with two different diameters were dispersed within poly(ε-caprolactone) (PCL) by melt-blending and coprecipitation, respectively, with the purpose to impart good ... [more ▼] Multiwalled carbon nanotubes (MWNTs) with two different diameters were dispersed within poly(ε-caprolactone) (PCL) by melt-blending and coprecipitation, respectively, with the purpose to impart good electromagnetic interference shielding properties to the polyester. Transmission electron microscopy showed that the MWNTs were uniformly dispersed as single nanotubes within the matrix. Because the nanotubes were broken down during melt-blending, the percolation threshold was observed at a lower filler content in the case of coprecipitation. Substitution of poly(ethylene-co-octene), poly(vinyl chloride), polypropylene, and polystyrene for PCL resulted in a much lower shielding efficiency. Finally, polycarbonate and poly(methyl methacrylate) appeared as promising substitutes for PCL, suggesting that π−π interactions between the nanotubes and constitutive carbonyl units of the polymers would be beneficial to the dispersion and ultimately to the electrical properties of the nanocomposites. [less ▲] Detailed reference viewed: 34 (15 ULg)Grafting of poly[2-(tert-butylamino)ethyl methacrylate] onto polypropylene by reactive blending and antibacterial activity of the copolymerThomassin, Jean-Michel ; Lenoir, Sandrine ; Riga, Johan et alin Biomacromolecules (2007), 8(4), 1171-1177 To combine low cost, good mechanical properties, and antibacterial activity in one material, a nonquaternized polymeric biocide, i.e., poly[2-(tert-butylamino)ethyl methacrylate] (PTBAEMA), was dispersed ... [more ▼] To combine low cost, good mechanical properties, and antibacterial activity in one material, a nonquaternized polymeric biocide, i.e., poly[2-(tert-butylamino)ethyl methacrylate] (PTBAEMA), was dispersed within a commodity plastic, i.e., polypropylene (PP). The high immiscibility of the two polymers was tackled by reactive compatibilization and thus by reaction of commercially available maleic anhydride grafted polypropylene with primary amine-end-capped PTBAEMA. This reactive polymethacrylate was synthesized by atom-transfer radical polymerization with an azide-containing initiator. The azide end group was converted into a primary amine by the Huisgen [3 + 2] cycloaddition of propargylamine. The accordingly formed PP-g-PTBAEMA copolymer was melt dispersed within neat PP and processed as fibers, whose antimicrobial properties were assessed by the viable cell counting method against Escherichia coli. The antibacterial activity was long-lasting as a result of the anchoring of the PTBAEMA chains onto PP, which prevented them from being released from the surface of the fibers. [less ▲] Detailed reference viewed: 46 (3 ULg) |
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