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See detailPolylactide macroporous biodegradable foams by solid-liquid and liquid-liquid phase separation
Maquet, V; Schugens, C; Grandfils, Christian ULg et al

Conference (1995, May 22)

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See detailPolylactide Macroporous Biodegradable Implants for Cell Transplantation. Ii. Preparation of Polylactide Foams by Liquid-Liquid Phase Separation
Schugens, C.; Maquet, Véronique; Grandfils, Christian ULg et al

in Journal of Biomedical Materials Research (1996), 30(4), 449-61

Potential of thermally induced phase separation as a porogen technique has been studied in an effort to produce a surgical implant suitable for cell transplantation. Emphasis has been placed on the liquid ... [more ▼]

Potential of thermally induced phase separation as a porogen technique has been studied in an effort to produce a surgical implant suitable for cell transplantation. Emphasis has been placed on the liquid-liquid phase separation of solutions of amorphous poly DL-lactide and semicrystalline poly L-lactide in an 87/13 dioxane/water mixture. The related temperature/composition phase diagrams have been set up by turbidimetry, and the possible occurrence of a gel has been discussed. Freeze-drying of some phase-separated polylactide solutions can produce flexible and tough foams with an isotropic morphology. Interconnected pores of 1-10 microns in diameter are expected to result from the spinodal decomposition of the polylactide solutions with formation of co-continuous phases. Thermodynamics of the polymer/solvent pair has a decisive effect on the final macroporous foams, as shown by the dependence of their porosity, density, porous morphology, and mechanical behavior on molecular weight and crystallinity of polylactide and concentration of the original solutions. On the basis of the foam characteristics, potential of the liquid-liquid phase separation (spinodal decomposition) has been compared with the solid/liquid phase separation (solvent crystallization) as a porogen technique. [less ▲]

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See detailPolylactide microparticles prepared by double emulsion-evaporation 2 : Effect of the poly(lactide-co-glycolide) composition on the stability of the primary and secondary emulsions
Nihant, Nicole; Schugens, Chantal; Grandfils, Christian ULg et al

in Journal of Colloid and Interface Science (1995), 173(1), 55-65

Polylactide and copolymers with glycolide have been used as coating polymers in the microencapsulation technique based on the W1/o/w2 double emulsion-evaporation method. Stability of the primary emulsion ... [more ▼]

Polylactide and copolymers with glycolide have been used as coating polymers in the microencapsulation technique based on the W1/o/w2 double emulsion-evaporation method. Stability of the primary emulsion is of critical importance and clearly predetermines the internal morphology of the microspheres, in agreement with the very fast hardening of the oil phase (CH2Cl2) as soon as the primary emulsion is dispersed in water. When the peptide or' protein to be encapsulated is able to interact with the coating polymer and possibly with the surfactant, the stabilization mechanism of the primary emulsion is very complex. It has been shown that the interaction of BSA (bovine serum albumin) with the polyester is as strong as the glycolide content is high, which results in the formation of a solid film at the w1/o interface and in a high emulsion stability. Addition of a surfactant, such as poloxamer 188, in the oil phase has a deleterious effect on both the emulsion stability and the internal structure of the microspheres. Use of a dye tracer in the internal aqueous phase was not useful in probing the double emulsion stability and the encapsulation efficiency, because of specific interactions between the dye (indigocarmine) and the coating polyester. [less ▲]

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See detailPolylactide Microparticules Prepared by Double Emulsion/Evaporation Technique. I. Effect of Primary Emulsion Stability
Nihant; Schugens, Chantal; Grandfils, Christian ULg et al

in Pharmaceutical Research (1994), 11(10), 1479-1484

The process of microencapsulation of proteins by double emulsion-evaporation in a matrix of polylactide (PLA) can be divided into three successive steps: first, an aqueous solution of the active compound ... [more ▼]

The process of microencapsulation of proteins by double emulsion-evaporation in a matrix of polylactide (PLA) can be divided into three successive steps: first, an aqueous solution of the active compound is emulsified into an organic solution of the hydrophobic coating polymer; second, this primary water-in-oil (w/o) is dispersed in water with formation of a double water-oil-water emulsion (w/o/w), third, the organic solvent is removed with formation of solid microparticles. This paper focuses of the effect of primary emulsion stability on the morphology and properties of polylactide microparticles loaded with bovine serum albumin (BSA) used as model drug. [less ▲]

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See detailPolylactone based Biomedical Materials : Chemistry and Breakthrough Applications
Dubois, Philippe ULg; Barakat, I; Degée, P et al

Poster (1992, November 22)

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See detailPolymer (PE) synthesis - scaling up to industrial scale
Detrembleur, Christophe ULg

Conference (2007, September 30)

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See detailPolymer based intraocular lens adsorbome: a bottom up proteomics study
Bertrand, Virginie ULg; Huang, Yi-Shiang ULg; Mazzucchelli, Gabriel ULg et al

Conference (2013, September 08)

In the present work an optimized sample preparation protocol to identify and quantify the “adsorbomes” of hydrophilic and hydrophobic materials for IOLs known to have a higher or a lower incidence of PCO ... [more ▼]

In the present work an optimized sample preparation protocol to identify and quantify the “adsorbomes” of hydrophilic and hydrophobic materials for IOLs known to have a higher or a lower incidence of PCO, respectively was obtained. [less ▲]

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See detailPolymer blending: a convenient technique for the preparation of new antimicrobial polymeric mateirals
Lenoir, Sandrine; Pagnoulle, Christophe; Petru, Stiube et al

Poster (2003, May 16)

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See detailPolymer coating of steel by a combination of electrografting and atom-transfer radical polymerization
Claes, Michaël; Voccia, Samuel; Detrembleur, Christophe ULg et al

in Macromolecules (2003), 36(16), 5926-5933

Cathodic electrografting of poly(2-chloropropionate ethyl acrylate) (poly[cPEA]) onto steel followed by the styrene grafting-from by atom transfer radical polymerization (ATRP) is an efficient strategy to ... [more ▼]

Cathodic electrografting of poly(2-chloropropionate ethyl acrylate) (poly[cPEA]) onto steel followed by the styrene grafting-from by atom transfer radical polymerization (ATRP) is an efficient strategy to impart strong adhesion to polystyrene films onto the electrically conductive substrate. Electrografting of poly(cPEA) chains at an appropriate potential and persistence of the activated chloride in the grafted chains were confirmed by XPS. Polystyrene deposition by ATRP with a ruthenium-based catalyst was analyzed by scanning electron microscopy and Raman spectroscopy. Adhesion of the polystyrene layer to the substrate is so strong that it cannot be detached by standard Scotch brand tapes. Moreover, local thermal analysis showed a loss of mobility for the PS chains tethered at the surface. [less ▲]

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See detailPolymer composite material structures comprising carbon based conductive loads
Jérôme, Robert ULg; Pagnoulle, Christophe; Detrembleur, Christophe ULg et al

Patent (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 ▲]

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See detailPolymer composite material structures comprising carbon based conductive loads
Jérôme, Robert ULg; Pagnoulle, Christophe; Detrembleur, Christophe ULg et al

Patent (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 ▲]

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See detailPolymer composite material structures comprising carbon based conductive loads
Jérôme, Robert ULg; Pagnoulle, Christophe; Detrembleur, Christophe ULg et al

Patent (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 ▲]

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See detailPolymer composite material structures comprising carbon based conductive loads
Jérôme, Robert ULg; Pagnoulle, Christophe; Detrembleur, Christophe ULg et al

Patent (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 ▲]

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See detailPolymer database for encapsulation
Grandfils, Christian ULg

Conference (2002, November 29)

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See detailPolymer design by organometallic-mediated radical polymerization (OMRP)
Debuigne, Antoine ULg; Jérôme, Christine ULg; Detrembleur, Christophe ULg

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 ▲]

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See detailPolymer 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
Kritz, J.; Brus, J.; Plestil, J. 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 ▲]

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See detailPolymer functionalized multi-walled carbon nanotubes
Petrov, Petar; Pagnoulle, Christophe; Stassin, Fabrice et al

Poster (2003, May 16)

Detailed reference viewed: 27 (3 ULg)