References of "Calberg, Cédric"
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See detailUse of supercritical carbon dioxide for polym/clay nanocomposites preparation and foaming
Urbanczyk, Laetitia ULg; Stassin, Fabrice; Calberg, Cédric ULg et al

Poster (2007, August 31)

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See detailSynthesis of PCL/clay masterbatches and their redispersion in poly(styrene-co-acrylonitrile)
Urbanczyk, Laetitia ULg; Stassin, Fabrice; Calberg, Cédric ULg et al

Poster (2007, August 27)

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See detailStructure and properties of a semifluorinated diblock copolymer modified epoxy blend
Ocando, Connie; Serrano, Elena; Tercjak, Agnieszka et al

in Macromolecules (2007), 40(11), 4068-4074

Novel nanostructured thermosetting materials have been prepared by modification of an epoxy resin with a semifluorinated diblock copolymer, poly(heptadecafluorodecyl acrylate)-b-poly(caprolactone), PaF-b ... [more ▼]

Novel nanostructured thermosetting materials have been prepared by modification of an epoxy resin with a semifluorinated diblock copolymer, poly(heptadecafluorodecyl acrylate)-b-poly(caprolactone), PaF-b-PCL. In a first step, the phase behavior and linear viscoelasticity of PaF-b-PCL were investigated. According to the segregation regime, no order-order transitions were detected, being the order-disorder transition temperature beyond the degradation temperature. Atomic force microscopy (AFM) images of the block copolymer after different thermal treatments revealed that self-assembly takes place into spherical nanodomains, which is consistent with the copolymer composition. This block copolymer was further used to prepare a nanostructured thermoset blend with an epoxy resin. DSC and DMA analysis reveals microphase separation of PaF block from the epoxy-rich phase after curing. The PaF block self-assembled into wormlike and spherical micelles in the thermoset system. This nanostructured blend presented unique surface properties showing high hydrophobicity (upsilon = 109 degrees) and low surface energy (17 mN/m). [less ▲]

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See detailControlled synthesis of carboxylic acid end-capped poly(heptadecafluorodecyl acrylate) and copolymers with 2-hydroxyethyl acrylate
Grignard, Bruno ULg; Jérôme, Christine ULg; Calberg, Cédric ULg et al

in Journal of Polymer Science. Part A, Polymer Chemistry (2007), 45(8), 1499-1506

1H,1H,2H,2H-Heptadecafluorodecyl acrylate (AC8) was polymerized by reversible addition-fragmentation chain transfer and copolymerized with 2-hydroxyethyl acrylate with the formation of random and block ... [more ▼]

1H,1H,2H,2H-Heptadecafluorodecyl acrylate (AC8) was polymerized by reversible addition-fragmentation chain transfer and copolymerized with 2-hydroxyethyl acrylate with the formation of random and block copolymers, respectively. The kinetics of the (co)polymerization was monitored with H-1 NMR spectroscopy and showed that the homopolymerization and random copolymerization of AC8 were under control. As a result of this control and the use of S-1-dodecyl-S-(alpha,alpha'-dimethyl-alpha"-acetic acid)trithiocarbonate as a chain-transfer agent, the copolymer chains were end-capped by an a-carboxylic acid group. Moreover, the controlled polymerization of AC8 was confirmed by the successful synthesis of poly(1H,1H,2H,2H-heptadecafluorodecyl acrylate)-b-poly(2hydroxyethyl acrylate) diblock copolymers, which were typically amphiphilic compounds. [less ▲]

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See detailEffects of incorporation of modified silica nanoparticles on the mechanical and thermal properties of PMMA
Etienne, Stéphanie; Becker, Claude; Ruch, David et al

in Journal of Thermal Analysis and Calorimetry (2007), 87(1), 101-104

Silica nanoparticles of various sizes have been incorporated by melt compounding in a poly(methyl methacrylate) (PMMA) matrix to enhance its thermal and mechanical properties. In order to improve ... [more ▼]

Silica nanoparticles of various sizes have been incorporated by melt compounding in a poly(methyl methacrylate) (PMMA) matrix to enhance its thermal and mechanical properties. In order to improve nanoparticles dispersion, PMMA grafted particles have been prepared by atom transfer radical polymerization (ATRP) from well-defined silica nanoparticles. This strategy was expected to ensure compatibility between both components of the PMMA nanocomposites. TEM analysis have been performed to evaluate the nanosilica dispersion whereas modified and non-modified silica/PMMA nanocomposites thermal stability and mechanical properties have been investigated by both thermogravimetric and dynamical mechanical analysis. [less ▲]

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See detailMotional heterogeneity of intercalated species in modified clays and poly(epsilon-caprolactone)/clay nanocomposites
Urbanczyk, Laetitia ULg; Hrobarikova, Jana; Calberg, Cédric ULg et al

in Langmuir (2006), 22(10), 4818-4824

Modified laponites and synthetic saponites are used as precursors for the preparation of poly(epsilon-caprolactone) (PCL)/clay nanocomposites. The structure and dynamics of species intercalated in the ... [more ▼]

Modified laponites and synthetic saponites are used as precursors for the preparation of poly(epsilon-caprolactone) (PCL)/clay nanocomposites. The structure and dynamics of species intercalated in the modified clays and the corresponding nanocomposites are characterized by X-ray diffraction and magic-angle spinning NMR. The influence of the headgroup, the hydrocarbon chain length, and the loading of the surfactant on the nanocomposite formation are discussed. The yield of PCL intercalation is related to the probability of direct polymer-clay interactions and to the size of the clay platelets. Relaxation times in the laboratory and rotating frames that allow characterization of fast and slow molecular dynamics in these systems are discussed, showing a motional heterogeneity of the intercalated species. [less ▲]

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See detailCaractérisation de matériaux poreux par analyse d'images 3D
Blacher, Silvia ULg; Gommes, Cédric ULg; Léonard, Angélique ULg et al

Conference (2006, February)

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See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO2 as foaming agent
Blacher, Silvia ULg; Calberg, Cédric ULg; Kerckhofs, Greet ULg et al

in Studies in Surface Science and Catalysis (2006), 160

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See detailThe porous structure of biodegradable scaffolds obtained with supercritical CO(2) as foaming agent
Blacher, Silvia ULg; Calberg, Cédric ULg; Kerckhofs, Greet ULg et al

in Studies in Surface Science and Catalysis (2006), 160

Poly(epsilon-caprolactone) foams were prepared, via a batch process, by using supercritical CO(2) as foaming agent. Their porous structure was characterized through helium and mercury pycnometry, scanning ... [more ▼]

Poly(epsilon-caprolactone) foams were prepared, via a batch process, by using supercritical CO(2) as foaming agent. Their porous structure was characterized through helium and mercury pycnometry, scanning electron microscopy (SEM) and X-ray microtomography observations coupled with image analysis. The pore size distributions obtained by these two latter techniques show that the pore structure is more homogeneous when the foaming process is performed under a high CO(2) saturation pressure (higher than 250 bars). [less ▲]

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See detailSynthesis of polymer nanocomposites and microspheres in supercritical carbon CO2
Urbanczyk, Laetitia ULg; Grignard, Bruno ULg; Stassin, Fabrice et al

Poster (2005, June 01)

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See detailSynthesis and foaming of polymer nanocomposites and microspheres in supercritical CO2
Urbanczyk, Laetitia ULg; Grignard, Bruno ULg; Stassin, Fabrice et al

Poster (2005, June 01)

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See detailSolid-state NMR study of intercalated species in poly(epsilon-caprolactone)/clay nanocomposites
Hrobarikova, J.; Robert, J. L.; Calberg, Cédric ULg et al

in Langmuir (2004), 20(22), 9828-9833

The structure and dynamics of surfactant and polymer chains in intercalated poly(epsilon-caprolactone)/clay nanocomposites are characterized by (31)P magic-angle spinning (MAS) and (13)C cross ... [more ▼]

The structure and dynamics of surfactant and polymer chains in intercalated poly(epsilon-caprolactone)/clay nanocomposites are characterized by (31)P magic-angle spinning (MAS) and (13)C cross-polarization MAS NMR techniques. To obtain hybrid materials with the low polymer content required for this study, in situ intercalative polymerization was performed by adapting a published procedure. After nanocomposite formation, the chain motion of the surfactant is enhanced in the saponite-based materials but reduced in the Laponite ones. Compared to the starting clay, the trans conformer population of the surfactant hydrocarbon chain in the nanocomposite decreases for the saponite systems. Mobility of the polymer chain is higher in the nanocomposites than in the bulk phase. The charge of the modified saponite does not significantly influence chain mobility in the nanocomposites. [less ▲]

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See detailFunctionalization of multi-walled carbon nanotubes by electrografting of polyacrylonitrile
Petrov, Petar; Lou, Xudong; Pagnoulle, Christophe et al

in Macromolecular Rapid Communications (2004), 25(10), 987-990

As a result of their unique architecture and remarkable mechanical and electrical properties[1,2] carbon nanotubes (CNTs)[3] have great potential that remains, however, un-exploited because of poor ... [more ▼]

As a result of their unique architecture and remarkable mechanical and electrical properties[1,2] carbon nanotubes (CNTs)[3] have great potential that remains, however, un-exploited because of poor dispersibility in liquids and problems of processability, Major efforts have, therefore, been devoted towards any modification of the CNTs that could improve their handling[4,5] Typically, chemical modification of CNTs is based on severe oxidation processes that often damage the tubes[5] Mild and single-step electrochemical modification of CNTs is a valuable alternative to the oxidative treatment. There are several reports in the scientific literature on the electrochemical functionalization of CNTs by electroreduction of diazonium salts,[6-8] and on the halogenation of MWNTs by electrolysis However, the grafting of polymers instead of low-molecular-weight compounds onto CNTs by an electrochemical process is a possible strategy for dispersing CNTs in polymer matrices and improving the mechanical properties of CNT-based nanocomposites.. For the past few years, we have been interested in the electiografting of insulating polymer films onto cathodic surfaces, for example, nickel and glassy carbon, provided that the potential and solvent are properly selected.[10-15] These films are designated as "grafted films", because they have the unique property of remaining attached to the electrode surface even when they are prepared and kept in a solvent in which the polymer is highly soluble. The extension of this technique to CNTs has been explored with acrylonitrile as monomer. This communication aims at reporting the functionaliza-tion of multi-walled carbon nanotubes (MWNTs) by the electropolymerization of acrylonitrile. [less ▲]

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See detailStructure and dynamics of cationic surfactants intercalated in synthetic clays
Müller, Robert; Hrobarikova, Jana; Calberg, Cédric ULg et al

in Langmuir (2004), 20(7), 2982-2985

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See detailSolid-state NMR study of poly(epsilon-caprolactone)/clay nanocomposites
Calberg, Cédric ULg; Jérôme, Robert ULg; Grandjean, Jean ULg

in Langmuir (2004), 20(5), 2039-2041

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