Showing results 81 to 100 of 440
  Polymer/carbon nanotube foamed by supercritical CO2 and freez-drying methodTran, Minh Phuong  ; Thomassin, Jean-Michel ; Alexandre, Michaël et alPoster (2011, May 12) Detailed reference viewed: 92 (8 ULg) Sustainable and bio-inspired chemistry for robust antibacterial activity of stainless steelFaure, Emilie ; Lecomte, Philippe ; et alin Journal of Materials Chemistry (2011), 21(22), 7901-7904 We report on the original synthesis of a poly(methacrylamide) bearing (oxidized) 3,4-dihydroxyphenylalanine specially designed to (i) insure film growth by covalent coupling, (ii) covalently bind an ... [more ▼] We report on the original synthesis of a poly(methacrylamide) bearing (oxidized) 3,4-dihydroxyphenylalanine specially designed to (i) insure film growth by covalent coupling, (ii) covalently bind an antibacterial peptide and (iii) contribute to the film cross-linking that is essential for the durability of the properties. [less ▲] Detailed reference viewed: 66 (25 ULg)Multifunctional hybrids for electromagnetic absorption; ; et al in Acta Materialia (2011), 59(8), 3255-3266 Electromagnetic (EM) interferences are ubiquitous in modern technologies and impact on the reliability of electronic devices and on living cells. Shielding by EM absorption, which is preferable over ... [more ▼] Electromagnetic (EM) interferences are ubiquitous in modern technologies and impact on the reliability of electronic devices and on living cells. Shielding by EM absorption, which is preferable over reflection in certain instances, requires combining a low dielectric constant with high electrical conductivity, which are antagonist properties in the world of materials. A novel class of hybrid materials for EM absorption in the gigahertz range has been developed based on a hierarchical architecture involving a metallic honeycomb filled with a carbon nanotube-reinforced polymer foam. The waveguide characteristics of the honeycomb combined with the performance of the foam lead to unexpectedly large EM power absorption over a wide frequency range, superior to any known material. The peak absorption frequency can be tuned by varying the shape of the honeycomb unit cell. A closed form model of the EM reflection and absorption provides a tool for the optimization of the hybrid. This designed material sets the stage for a new class of sandwich panels combining high EM absorption with mass efficiency, stiffness and thermal management. [less ▲] Detailed reference viewed: 32 (4 ULg)Preparation and characterization of thermoresponsive gold nanohybridsLiu, Ji ; Hurtgen, Marie ; Detrembleur, Christophe et alPoster (2011, April 29) Detailed reference viewed: 32 (8 ULg)A green bio-inspired strategy to impart antibacterial activity to stainless steelFaure, Emilie ; Lecomte, Philippe ; Vreuls, Christelle et alPoster (2011, April 29) Detailed reference viewed: 27 (5 ULg)Progress in understanding the crosslinking reaction of nanocomposite hydrogels (NCH)Herwats, Stéphane ; Alexandre, Michaël ; Jérôme, Christine et alPoster (2011, April 29) Detailed reference viewed: 19 (6 ULg)Supercritical carbon dioxide as a green foaming agent: application for the purpose of polymer/carbon nanotube foamsTran, Minh Phuong ; Thomassin, Jean-Michel ; Alexandre, Michaël et alPoster (2011, April 29) Detailed reference viewed: 43 (10 ULg)Cobalt-mediated radical copolymerization of conjugated and non-conjugated monomersHurtgen, Marie ; Debuigne, Antoine ; Jérôme, Christine et alPoster (2011, April 29) Detailed reference viewed: 15 (3 ULg)Insight into organometallic-mediated radical polymerizationHurtgen, Marie ; Detrembleur, Christophe ; Jérôme, Christine et alin Polymer Reviews (2011), 51(2), 188-213 This review focuses on an emerging class of controlled radical polymerization named Organometallic-Mediated Radical Polymerization (OMRP). The latter is based on the temporary deactivation of the growing ... [more ▼] This review focuses on an emerging class of controlled radical polymerization named Organometallic-Mediated Radical Polymerization (OMRP). The latter is based on the temporary deactivation of the growing radical species by a transition metal complex and the reversible formation of a carbon-metal covalent bond. Initially developed with cobalt complexes, OMRP has extended to several metals today. As highlighted here, the choice of the metal, the structure of ligands, temperature, and additives deeply affect the course of the polymerization and its mechanism. Macromolecular engineering opportunities offered by OMRP are also described, as well as practical applications sustained by the resulting polymer materials. [less ▲] Detailed reference viewed: 21 (3 ULg)Functionalization of carbon nanotubes by polymers using grafting to methodsThomassin, Jean-Michel ; Jérôme, Robert ; Jérôme, Christine et alin Mittal, Vikas (Ed.) Surface modification of nanotube fillers (2011) The huge research effort devoted to the chemical modification of CNTs by grafted macromolecules is driven by the need to enhance their affinity for a variety of environments, a necessary step for ... [more ▼] The huge research effort devoted to the chemical modification of CNTs by grafted macromolecules is driven by the need to enhance their affinity for a variety of environments, a necessary step for designing advanced nanomaterials. This chapter aims at reviewing the until now investigated “grafting to” methods used for the surface modification of carbon nanotubes (CNTs) by polymers of various functionalities. Two major strategies are emphasized on the basis of the number of needed modification steps. The first technique consists in functionalizing the CNTs surface to promote in a second step the covalent anchoring of polymer chains bearing complementary reactive groups either at one chain-end or along the chain. The second approach is straightforward as result of the ability of the selected polymer to add directly onto the sp2 carbons of the CNTs surface. The major advantage of the “grafting onto” techniques is that the molecular characteristics (molecular weight, polydispersity, functionality,…) of the polymers can be tailored prior to the grafting reaction. Moreover, when using the proper controlled or living polymerization techniques and grafting conditions, polymers of well-defined architecture, functionality and properties can be easily anchored to the CNTs surface, which makes the “on-demand” tuning of the chemical properties of CNTs possible. [less ▲] Detailed reference viewed: 48 (3 ULg)Methodology for the characterization of the microstructure of nanocomposite polymeric foams using X-ray microtomographyPlougonven, Erwan ; Marchot, Pierre ; Detrembleur, Christophe et alin Micro-CT User Meeting Abstract Book (2011, April 13) Polymeric foams used in electromagnetic shielding applications are characterized using X-ray microtomography. These foams contain a conductive nanometric reinforcement, carbon nanotubes, but the scale of ... [more ▼] Polymeric foams used in electromagnetic shielding applications are characterized using X-ray microtomography. These foams contain a conductive nanometric reinforcement, carbon nanotubes, but the scale of characterization described here is that of the microscopic cells. Although nanotube dispersion is important for the final properties of the material, the structure and distribution of the porosity also play a role in terms of dielectric constant and conductivity. Unfortunately, cell wall thinness and limited resolution of laboratory microtomographs makes poper cell identification difficult. Therefore we present a new statistical method based on the 3D autocorrelation function, that allows to some extent to measure mean cell size and structure anisotropy. [less ▲] Detailed reference viewed: 66 (29 ULg)Recent Advances in Macromolecular Design via Cobalt-Mediated Radical PolymerizationDebuigne, Antoine ; Hurtgen, Marie ; Piette, Yasmine et alConference (2011, April 13) This communication will focuse on recent progress in the field of cobalt-mediated radical polymerization (CMRP). For example, the beneficial impact of cobalt complexes on the course of acrylate and vinyl ... [more ▼] This communication will focuse on recent progress in the field of cobalt-mediated radical polymerization (CMRP). For example, the beneficial impact of cobalt complexes on the course of acrylate and vinyl chloride (VC) polymerizations will be discussed. The addition of conjugated unsaturated derivatives, like dienes, fullerenes and carbon nanotubes, onto (co)polymers preformed by CMRP has also been investigated. Similarities and differences between these radical addition processes will be presented as well as the potential applications of the resulting copolymers and carbon based materials for photodynamic therapy (PDT) and electromagnetic interferences (EMI) shielding. [less ▲] Detailed reference viewed: 15 (1 ULg)Multifunctional coatingsVan de Weerdt, Cécile ; Detrembleur, Christophe ; et alPatent (2011) New polyelectrolyte copolymer, composite material, multilayer film and substrate carrying such polyelectrolyte copolymer, composite and multilayer film wherein the polyelectrolyte copolymer comprises a) a ... [more ▼] New polyelectrolyte copolymer, composite material, multilayer film and substrate carrying such polyelectrolyte copolymer, composite and multilayer film wherein the polyelectrolyte copolymer comprises a) a first type of identical or different units (A) each comprising one or more dihydroxyphenyl groups such that sidechains are present along the backbone of the polyelectrolyte copolymer which contain at least one dihydroxyphenyl group each; and (b1) a second type of identical or different units (B1) each comprising a cationic moiety, or (b2) a second type of identical or different units (B2) each comprising an anionic moiety. [less ▲] Detailed reference viewed: 21 (3 ULg)Magnetic hybrid materials for triggered drug delivery and optical properties of intraocular lensLiu, Ji ; Jérôme, Christine ; Detrembleur, Christophe et alConference (2011, March 15) Detailed reference viewed: 36 (7 ULg)Low viscosity allophanates containing actinically curable groups; Detrembleur, Christophe ; et alPatent (2011) The present invention relates to a process for preparing radiation-curing binders containing allophanate groups by reacting at temperatures of !<=130 DEG C. A) one or more compounds containing uretdione ... [more ▼] The present invention relates to a process for preparing radiation-curing binders containing allophanate groups by reacting at temperatures of !<=130 DEG C. A) one or more compounds containing uretdione groups with B) one or more OH-functional compounds which contain groups which react, with polymerization, with ethylenically unsaturated compounds on exposure to actinic radiation (radiation-curing groups), C) optionally NCO-reactive compounds other than B), in the presence of D) a catalyst containing at least one zinc compound, to form allophanate groups by opening the uretdione ring. [less ▲] Detailed reference viewed: 12 (4 ULg)An efficient biphasic synthesis of polymer-grafted reduced graphite oxide based nanocompositesVuluga, Daniela ; Thomassin, Jean-Michel ; et alPoster (2011, March 03) Detailed reference viewed: 15 (4 ULg)Multifunctional coatingsVan de Weerdt, Cécile ; Detrembleur, Christophe ; et alPatent (2011) New polyelectrolyte copolymer, composite material, multilayer film and substrate carrying such polyelectrolyte copolymer, composite and multilayer film wherein the polyelectrolyte copolymer comprises a) a ... [more ▼] New polyelectrolyte copolymer, composite material, multilayer film and substrate carrying such polyelectrolyte copolymer, composite and multilayer film wherein the polyelectrolyte copolymer comprises a) a first type of identical or different units (A) each comprising one or more dihydroxyphenyl groups such that sidechains are present along the backbone of the polyelectrolyte copolymer which contain at least one dihydroxyphenyl group each; and (b1) a second type of identical or different units (B1) each comprising a cationic moiety, or (b2) a second type of identical or different units (B2) each comprising an anionic moiety. [less ▲] Detailed reference viewed: 17 (2 ULg)Organomodification of montmorillonite in supercritical carbon dioxideNaveau, Elodie ; Calberg, Cédric ; Detrembleur, Christophe et alin Applied Clay Science (2011), 51(4), 467-772 The use of organo-montmorillonite as nanofiller for the preparation of polymer nanocomposites still attracts a lot of attention both on experimental and industrial scale. In order to enlarge the range of ... [more ▼] The use of organo-montmorillonite as nanofiller for the preparation of polymer nanocomposites still attracts a lot of attention both on experimental and industrial scale. In order to enlarge the range of organo-montmorillonites available for this application, supercritical carbon dioxide (scCO2) was used as a medium for the organomodification process. This environmentally friendly solvent showed a great potential to obtain ready-to-use organo-montmorillonite powders. Intercalation with high degrees of exchange was obtained when the surfactants (alkyl ammonium, phosphonium, and imidazolium salts) were in the liquid state at the reaction temperature. The addition of a small quantity of co-solvent enabled the intercalation of solid surfactants, such as those bearing hydroxyl or carboxyl groups. Basal spacings of montmorillonite modified in scCO2 corresponded to those measured for organo-montmorillonite prepared in the wet process. A detailed investigation of the reaction conditions was finally performed in order to up-scale the process. [less ▲] Detailed reference viewed: 22 (4 ULg)Novel graft copolymers by organometallic-mediated radical polymerization of a conjugated with a non-conjugated monomerHurtgen, Marie ; Debuigne, Antoine ; et alScientific conference (2011, February 24) Detailed reference viewed: 11 (2 ULg)Nanostructured polymer blends: from core/shell nanoobjects to continuous three-phase morphologies; Detrembleur, Christophe ; et alin Macromolecular Materials and Engineering (2011), 296(2), 122-130 A PS-b-PIP-b-PMMA copolymer has been melt-blended with homo-PMMA with a similar molecular weight as the PMMA block. For a 50:50 wt.-% mixture, the components form 3D bicontinuous lamellae. Upon annealing ... [more ▼] A PS-b-PIP-b-PMMA copolymer has been melt-blended with homo-PMMA with a similar molecular weight as the PMMA block. For a 50:50 wt.-% mixture, the components form 3D bicontinuous lamellae. Upon annealing at 190 °C, a more regular network is observed, which consists of PMMA and 55 nm-thick bilayered lamellae of triblock copolymer, both being continuous. This co-continuity persists even when of the homo-PMMA is twice that of the PMMA block in the copolymer. For 30:70 and 20:80 wt.-% copolymer/homopolymer pair, the copolymer forms cylindrical and spherical phases, respectively. Blends have also been prepared by solvent casting. Large domains of copolymer interconnected by few lamellae are observed in the 50:50 blend that reorganize into a bicontinuous network upon annealing. [less ▲] Detailed reference viewed: 8 (4 ULg) |
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