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Showing results 69181 to 69200 of 95205
  Polymer composite material structures comprising carbon based conductive loadsJérôme, Robert  ; ; Detrembleur, Christophe et alPatent (2010) 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: 35 (2 ULg)Polymer design by cobalt-mediated radical polymerizationDebuigne, Antoine ; Jérôme, Christine ; Detrembleur, Christophe Conference (2011, September 27) Detailed reference viewed: 19 (4 ULg)Polymer design by organometallic-mediated radical polymerizationDebuigne, Antoine ; Jérôme, Christine ; Detrembleur, Christophe Conference (2011, September 29) Detailed reference viewed: 13 (1 ULg) Polymer design by organometallic-mediated radical polymerization (OMRP)Debuigne, Antoine ; Jérôme, Christine ; Detrembleur, Christophe in Polymer Preprints of Japan (2011), 60(2), 2565-2567 Transition metal-assisted polymerization techniques have always played a crucial role in polymer synthesis. As an illustration, metallic compounds have deeply marked the field of living/controlled radical ... [more ▼] Transition metal-assisted polymerization techniques have always played a crucial role in polymer synthesis. As an illustration, metallic compounds have deeply marked the field of living/controlled radical polymerization (L/CRP) which gives access to well-defined polymers under non drastic conditions. Indeed, atom transfer radical polymerization (ATRP) is one of the most successful methods to polymerize vinyl monomers in a controlled manner. Besides this very successful system, another metal-assisted CRP technique is emerging, i.e. organometallic-mediated radical polymerization (OMRP). In contrast to ATRP, OMRP involves the reversible formation of a covalent bond between a transition metal and the polymer chains, which strongly decreases the extent of termination reactions and leads to polymers with predictable molecular weights. This lecture aims to provide a comprehensive overview of the synthetic and mechanistic aspects of OMRP as well as major achievements and remaining challenges in this field. [less ▲] Detailed reference viewed: 25 (1 ULg)Polymer dynamics In an Interface-confined space: NMR study of poly(hexyl ethacrylate)-block-poly(acrylic acid) and poly(dodercyl methacrylate)-block-poly(acrylic acid) micelles in D2O; ; et al in Macromolecules (2000), 33(11), 4108-4115 The mobility of distant methyl side groups in poly(hexyl methacrylate)-block-poly(sodium acrylate) (PHMA−PAANa) and poly(dodecyl methacrylate))-block-poly(sodium acrylate) (PLMA−PAANa) micelles, dispersed ... [more ▼] The mobility of distant methyl side groups in poly(hexyl methacrylate)-block-poly(sodium acrylate) (PHMA−PAANa) and poly(dodecyl methacrylate))-block-poly(sodium acrylate) (PLMA−PAANa) micelles, dispersed in D2O and characterized by SANS, was studied using 1H single and double quantum high-resolution and MAS NMR. Transverse and rotating-frame relaxation was studied at temperatures 320−345 K in the original micellar solutions and in the systems with their viscosity gradually increased by additions of high-molecular-weight poly(ethylene oxide) and with the micellar cores gradually swollen by chlorobenzene. The relaxation data were quantitatively evaluated using a pragmatic model based on Cohen-Addad's theory. The results obtained strongly indicate that the side groups are relatively immobilized to an even higher degree than in poly(2-ethylhexyl acrylate)-block-poly(acrylic acid) micelles at the same conditions. The most immobilized groups are at or near the interface. Possible underlying effects, including penetration resistance of the surrounding water molecules, fixation of the polymer backbone at the interface, and motional correlation between the distant side group and the backbone are discussed. [less ▲] Detailed reference viewed: 19 (2 ULg)Polymer foaming with supercritical CO2 and nanoclays: a very effective means to fine tune the desired cellular morphologyUrbanczyk, Laetitia ; Calberg, Cédric ; Alexandre, Michaël et alScientific conference (2009, September 28) Detailed reference viewed: 22 (7 ULg)Polymer functionalized multi-walled carbon nanotubes; ; et al Poster (2003, May 16) Detailed reference viewed: 21 (3 ULg)Polymer layered silicate/carbon nanotube nanocomposites : Morphological and rheological properties; Alexandre, Michaël ; et alin Macromolecular Symposia (2005), 221 Morphological and rheological properties of new ternary nanocomposites based on ethylene vinyl acetate copolymers (EVA), commercial organo-modified clays (organoclays) and purified multi-walled carbon ... [more ▼] Morphological and rheological properties of new ternary nanocomposites based on ethylene vinyl acetate copolymers (EVA), commercial organo-modified clays (organoclays) and purified multi-walled carbon nanotubes (MWNTs), prepared via direct melt blending, have been evaluated. For sake of comparison, the corresponding binary compositions, i.e., EVA filled with either organoclays or MWNTs, have been investigated as well. While extensive exfoliation can be observed for binary EVA/clay nanocomposites, the addition of MWNTs appears to limit clay exfoliation. Rheological properties show that both clay and MWNTs increase the elastic modulus of the nanocomposites, reflecting the high degree of nanoparticle interconnectivity that can be found in these materials. [less ▲] Detailed reference viewed: 56 (5 ULg)Polymer layered silicate/carbon nanotubes nanocomposites: morphological and rheological properties; Alexandre, Michaël ; et alPoster (2004, May 27) Detailed reference viewed: 11 (3 ULg)Polymer Maximum Drag Reduction: A Unique Transitional State; ; et al E-print/Working paper (2011) The upper bound of polymer drag reduction is identified as a unique transitional state between laminar and turbulent flow corresponding to the onset of the nonlinear breakdown of flow instabilities. Detailed reference viewed: 18 (4 ULg)Polymer maximum drag reduction: A unique transitional state; ; et al in Annual Research Briefs (2010) Detailed reference viewed: 18 (3 ULg)Polymer membrane by electrospinningAqil, Abdelhafid ; Grignard, Bruno ; Croisier, Florence et alPoster (2008, November 28) Detailed reference viewed: 29 (8 ULg)Polymer micelles decorated by gadolinium complexes as MRI blood contrast agents: design, synthesis and propertiesGrogna, Mathurin ; Cloots, Rudi ; Luxen, André et alin Polymer Chemistry (2010), 1 New micellar macrocontrast agents with improved contrast at high frequencies were designed by grafting a gadolinium based contrast agent onto functional stealth micelles formed by poly(ethylene oxide)-b ... [more ▼] New micellar macrocontrast agents with improved contrast at high frequencies were designed by grafting a gadolinium based contrast agent onto functional stealth micelles formed by poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) in water. As evidenced by relaxometry measurements and the hemolytic CH50 test, the new contrast agents are of interest as MRI blood pool agents. [less ▲] Detailed reference viewed: 34 (12 ULg)Polymer stretching in a turbulent flow through Brownian DynamicsTerrapon, Vincent Conference (2003, November) Detailed reference viewed: 1 (0 ULg)Polymer-layered silicate nanocomposites: preparation, properties and uses of a new class of materialsAlexandre, Michaël ; Dubois, Philippe in Materials Science & Engineering. R: Reports (2000), R28(1-2), 1-63 A review with 115 refs. This review aims at reporting on very recent developments in syntheses, properties and (future) applications of polymer-layered silicate nanocomposites. This new type of materials ... [more ▼] A review with 115 refs. This review aims at reporting on very recent developments in syntheses, properties and (future) applications of polymer-layered silicate nanocomposites. This new type of materials, based on smectite clays usually rendered hydrophobic through ionic exchange of the sodium interlayer cation with an onium cation, may be prepd. via various synthetic routes comprising exfoliation adsorption, in situ intercalative polymn. and melt intercalation. The whole range of polymer matrixes is covered, i.e., thermoplastics, thermosets and elastomers. Two types of structure may be obtained, namely intercalated nanocomposites where the polymer chains are sandwiched in between silicate layers and exfoliated nanocomposites where the sepd., individual silicate layers are more or less uniformly dispersed in the polymer matrix. This new family of materials exhibits enhanced properties at very low filler level, usually inferior to 5 wt.%, such as increased Young's modulus and storage modulus, increase in thermal stability and gas barrier properties and good flame retardancy. [on SciFinder (R)] [less ▲] Detailed reference viewed: 8 (0 ULg)Polymer-modified multi-walled carbon nanotubes for ultrathin transparent conductive coatings; ; et al in PMSE Preprints (2006), 95 Detailed reference viewed: 14 (0 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)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: 93 (8 ULg)Polymer/carbon nanotubes nanocompositesThomassin, Jean-Michel ; Caldarella, Giuseppe ; Germain, Albert et alPoster (2007, August 31) Detailed reference viewed: 16 (2 ULg)Polymer/layered silicate nanocomposites by combined intercalative polymerization and melt intercalation: a masterbatch process; ; et al in Polymer (2003), 44(7), 2033-2040 Poly(ε-caprolactone) (PCL) and poly(vinyl chloride) (PVC) layered silicate nanocomposites were prepared by combination of intercalative polymerization and melt intercalation. In a first step, high clay ... [more ▼] Poly(ε-caprolactone) (PCL) and poly(vinyl chloride) (PVC) layered silicate nanocomposites were prepared by combination of intercalative polymerization and melt intercalation. In a first step, high clay content PCL nanocomposites were prepared by in situ polymerization of -caprolactone intercalated between selected organo-modified silicate layers. The polymerization was catalyzed with dibutyltin dimethoxide in the presence of montmorillonites, the surface of which were previously exchanged with (functionalized) long alkyl chains ammonium cations. Then, these highly filled PCL nanocomposites were added as masterbatches in commercial PCL and PVC by melt blending. The intercalation of PCL chains within the silicate layers by in situ polymerization proved to be very efficient, leading to the formation of intercalated and/or exfoliated structures depending on the organo-clay. These masterbatches were readily dispersed into the molten PCL and PVC matrices yielding intercalated/exfoliated layered silicate nanocomposites which could not be obtained by melt blending the matrix directly with the same organo-modified clays. The formation of nanocomposites was assessed both by X-ray diffraction and transmission electronic microscopy. Interestingly, this so-called 'masterbatch' two-step process allowed for preparing PCL nanocomposites even with non-modified natural clay, i.e. sodium montmorillonite, which showed a material stiffness much higher than the corresponding microcomposites recovered by direct melt intercalation. The thermal stability of PCL nanocomposites as a function of clay content was investigated by thermogravimetry (TGA). [less ▲] Detailed reference viewed: 59 (2 ULg) |
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