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See detailL'université entre hasard et nécessité
Hanzen, Christian ULg

Speech/Talk (2009)

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See detailProceeding of IMPROVE EU Project (FP6 n°031382) Workshop
Rigo, Philippe ULg; Zanic, V.

Book published by University of Zagreb - V Zanic - Coord. Ph Rigo; Editor V. Zanic; Publ. Univ. of Zagreb (2009)

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See detailSynthesis of novel block copolymers by cobalt-mediated radical polymerization (CMRP) and isoprene-assisted radical coupling reaction (I-ARC)
Debuigne, Antoine ULg; Jérôme, Christine ULg; Detrembleur, Christophe ULg

Conference (2009, September 17)

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and ... [more ▼]

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and well-defined molecular parameters. In this context, we designed an innovative and very promising tool for macromolecular engineering. This technique, called Isoprene-Assisted Radical Coupling (I-ARC), allows to couple quantitatively polymer chains preformed by Cobalt-Mediated Radical Polymerization (CMRP), an efficient controlled radical polymerization system for vinyl acetate (VAc) and acrylonitrile (AN). Typically, addition of isoprene to well-defined polymers prepared by CMRP invariably leads to the quantitative coupling reaction of the chains, as assessed by the perfect doubling of the molar mass of the polymer. Importantly, the I-ARC reaction is not limited to macromolecules with low molar masses and homopolymers, contrary to the previously reported radical chains coupling methods. Indeed, when applied to diblock copolymers, I-ARC constitutes a straightforward approach for the synthesis of telechelic symmetrical ABA triblock copolymers, as illustrated by the preparation of poly(vinyl acetate)-b-poly(acrylonitrile)-b-poly(vinyl acetate) triblock copolymers and their derivatives. [less ▲]

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See detailIn situ formation of stabilizers for the implementation of dispersion nitroxide mediated polymerization of MMA in supercritical carbon dioxide
Grignard, Bruno ULg; Gigmes, Didier; Jérôme, Christine ULg et al

Poster (2009, September 17)

Controlled dispersion Nitroxide Mediated Polymerization (NMP) of methyl methacrylate (MMA) was successfully carried out for the first time in supercritical carbon dioxide (scCO2) in the presence of CO2 ... [more ▼]

Controlled dispersion Nitroxide Mediated Polymerization (NMP) of methyl methacrylate (MMA) was successfully carried out for the first time in supercritical carbon dioxide (scCO2) in the presence of CO2-philic perfluorinated surfactant that was generated “in situ”. The control of the MMA polymerization relies on the strategy developed by Charleux et al. that consists of using a SG1-based alkoxyamine, i.e. the block-builder, in the presence of small amount of styrene. In a first step, CO2 soluble polyheptadecafluorodecylacrylate was prepared in scCO2 using block-builder as an alkoxyamine. In a second step, nitroxide SG1 mediated dispersion polymerization of MMA was conducted at 70°C and 300 bar in the presence of 5 w% of SG1 terminated surfactant compared to the monomer. Different monomer to alkoxyamine molar ratios were investigated in order to target different molecular weights. In each case, the monomer conversion was high (>90 %), the experimental molecular weight was in good agreement with the theoretical value and the polydispersity was narrow (Mw/Mn ~1.2). Moreover, after depressurisation of the cell, PMMA was collected as a free flowing powder consisting of small sized microspheres. [less ▲]

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See detailNew perfulorinated macroligand for the implementation of dispersion atom transfer radical polymerization in sc CO2
Grignard, Bruno ULg; Calberg, Cédric ULg; Jérôme, Christine ULg et al

Poster (2009, September 17)

Due to an increasing need for polymers with well-defined architecture (diblock-, graft-, star-shaped copolymers), molecular weight and/or functional end-groups, the use of controlled radical ... [more ▼]

Due to an increasing need for polymers with well-defined architecture (diblock-, graft-, star-shaped copolymers), molecular weight and/or functional end-groups, the use of controlled radical polymerization (CRP) in scCO2 has started to gain attention. Among all the controlled processes, Atom Transfer Radical Polymerization has emerged as a robust tool for the preparation of polymers with well-defined molecular weight, architecture and chain-end functionality. In a very recent paper, we reported the first efficient dispersion ATRP of methyl methacrylate (MMA) in scCO2 using a fluorinated polymeric ligand that had a dual role, i.e., the complexation of the copper salt and the stabilization of PMMA growing particles. In this contribution, we extended this new system to the dispersion ATRP of styrene2, to the synthesis of diblock copolymers beads2 or to the preparation of PMMA particles by AGET ATRP. Because both ATRP and alkyne-azide Huisgen’s 1,3-dipolar cycloaddition relies on the use of a Cu(I) catalyst, synthesis of pyrene end-functionalized polymers by simultaneous dispersion ATRP and click reaction was also investigated in supercritical carbon dioxide. Finally, the immobilization of these new macroligands onto an inorganic support leads to the formation of pseudo-homogeneous catalyst that were successfully used to prepare CO2-soluble perfluorinated methacrylate and depending on the molecular weight and TEDETA composition of the macroligand, results obtained by supported ATRP without addition of Cu(II) as deactivator are identical to those obtained by homogeneous ATRP. [less ▲]

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See detailCobalt-mediated radical polymerization of vinyl monomers: investigation of cobalt-coordination
Debuigne, Antoine ULg; Piette, Yasmine ULg; Poli, Rinaldo et al

Poster (2009, September 17)

Controlled Radical Polymerization techniques have been developed to obtain well-defined architectures and to control polymer parameters. Among these systems is Cobalt-Mediated Radical Polymerization (CMRP ... [more ▼]

Controlled Radical Polymerization techniques have been developed to obtain well-defined architectures and to control polymer parameters. Among these systems is Cobalt-Mediated Radical Polymerization (CMRP), which is based on the reversible deactivation of the growing radical chains with a cobalt complex, the cobalt (II) bis(acetylacetonate). The interest of this system is not only due to its ability to control the polymerization of very reactive monomers such as vinyl acetate (VAc) and N-vinylpyrrolidone (NVP), but also its peculiar mechanism which exhibits two pathways depending on the polymerization conditions; a reversible termination process and a degenerative chain transfer mechanism. Furthermore, it has been showed that the Co-C bond strength and thus the polymerization are strongly influenced by the use of some additives, such as water, dimethylformamide, dimethylsulfoxide and pyridine, which coordinate the cobalt free site. In this presentation we report the use of a preformed alkyl-cobalt(III) adduct as initiator for the polymerization of various vinyl monomers of different reactivity (VAc, acrylonitrile,…) and on the effect of several ligands on their polymerization control. The preparation of novel block copolymers by CMRP will finally be presented. As a conclusion, cobalt-coordination appears today as a unique opportunity to adjust the Co-C bond strength and to push back the bounds of possibilities in terms of macromolecular engineering assisted by CMRP. [less ▲]

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See detailCobalt mediated radical polymerization (CMRP) using bis(acetylacetonato)cobalt(II): a unique tool for controlling the radical polymerization of conjugated and unconjugated vinyl monomers
Hurtgen, Marie ULg; Debuigne, Antoine ULg; Jérôme, Christine ULg et al

Poster (2009, September 17)

Cobalt-Mediated Radical Polymerization (CMRP) imparts a high level of control on the polymerization of acrylic and vinylic esters, acrylic acid and acrylonitrile. However, each class of monomers appears ... [more ▼]

Cobalt-Mediated Radical Polymerization (CMRP) imparts a high level of control on the polymerization of acrylic and vinylic esters, acrylic acid and acrylonitrile. However, each class of monomers appears to be controlled by one class of cobalt complexes. For example, the polymerization of acrylates and acrylic acid is mediated by cobalt porphyrin complexes while vinyl acetate (VAc) and acrylonitrile are efficiently controlled by bis(acetylacetonato)cobalt(II) (Co(acac)2). Therefore, a challenging issue in CMRP remains to broaden the range of monomers that can be controlled by the same cobalt complex. Recently, the controlled random copolymerization of butyl acrylate (BuA) with VAc was performed using the conventional V-70/Co(acac)2 CMRP system, but the homopolymerization of BuA remained uncontrolled. In this work, we used a new alkylcobalt(III) adduct to initiate and control the copolymerization of BuA with VAc. This achievement resulted in a significant improvement over the V-70/Co(acac)2 pair regarding the molecular weight control and the polydispersity indexes. Moreover, for the first time, the alkylcobalt(III) adduct was also efficient in controlling the homopolymerization of BuA and yielded low polydispersity PBuA even in the absence of VAc. These results indicate that Co(acac)2 is a versatile mediator for the CMRP of both unconjugated vinyl monomers (VAc, N-vinylpyrrolidone) and conjugated monomers such as acrylates. It gives access to copolymers that cannot be prepared by other controlled radical polymerization techniques. [less ▲]

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See detailα-chloro-ε-caprolactone, a versatile precursor for grafting of aliphatic polyesters
Riva, Raphaël ULg; Lenoir, Sandrine ULg; Lecomte, Philippe ULg et al

Poster (2009, September 17)

Macromolecular engineering is one of the most powerful tool to synthesise many polymers of various architectures and with tailored properties. This contribution aims at reporting on a novel strategy for ... [more ▼]

Macromolecular engineering is one of the most powerful tool to synthesise many polymers of various architectures and with tailored properties. This contribution aims at reporting on a novel strategy for the macromolecular engineering of poly-ε-caprolactone (PCL) which is based on the use of a dual monomer / initiator compound, α-chloro-ε-caprolactone (αClεCL). Indeed, αClεCL is not only polymerizable by ring opening initiated by metal alkoxides, but it is also an initiator for the atom transfer radical polymerization (ATRP) of vinyl monomers, so leading easily to the synthesis of macromonomers. Polystyrene macromonomer has been prepared by this method and successfully copolymerized with ε-caprolactone (εCL) with formation of the corresponding grafted PCL. αClεCL is also a precursor of copolyesters with εCL that bear pendant chlorides. These (co)polyesters have been used as macroinitiators for the ATRP of methyl methacrylate in order to synthesise the corresponding graft copolymer. On the other hand, the pendant chlorides of poly(αClεCL-co-εCL) copolyesters were easily converted into azide with formation of the corresponding azide bearing copolyester. This copolyester was then reacted with an alkyne bearing an ATRP initiator by “Click chemistry”. The conversion of chlorides into more efficient ATRP initiators led to the improvement of the initiation efficiency of the macroinitiator. [less ▲]

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Peer Reviewed
See detailIMPROVE - Design of Innovative Ship Concepts using an Integrated Decision Support System for Ship Production and Operation
Rigo, Philippe ULg

in IMPROVE Workshop (EU Project FP6 n°031382), DUBROVNIK 17-18 Sept. 2009, Croatia, Editor V. Zanic – Univ. of Zagreb (2009, September 17)

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See detailHerstellung von neuen strahlenhärtenden bindemitteln
Detrembleur, Christophe ULg; Weikard, Jan; Greszta-Franz, Dorota et al

Patent (2009)

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung neuartiger Bindemittel, die unter Einwirkung aktinischer Strahlung mit ethylenisch ungesättigten Verbindungen unter Polymerisation ... [more ▼]

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung neuartiger Bindemittel, die unter Einwirkung aktinischer Strahlung mit ethylenisch ungesättigten Verbindungen unter Polymerisation reagierende Gruppen und gegebenenfalls auch gegenüber Isocyanaten reaktive Gruppen aufweisen, sowie deren Verwendung in Beschichtungsmitteln. [less ▲]

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See detailDéveloppement durable: Moins, mieux, autrement
Ozer, Pierre ULg

Conference given outside the academic context (2009)

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See detailFoams of polyurethane/MWNT nanocomposites for efficient EMI reduction
Chen, Y. Y.; Urbanczyk, Laetitia ULg; Thomassin, Jean-Michel ULg et al

Poster (2009, September 16)

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See detailIntroduction au droit commercial
Thirion, Nicolas ULg; Delvaux, Thierry; Benoit-Moury, Anne

Learning material (2009)

Le cours d'introduction au droit commercial, destiné à des non-juristes, a pour objet de décrire, dans ses grandes lignes, le régime juridique applicable à l'organisation et au fonctionnement de l ... [more ▼]

Le cours d'introduction au droit commercial, destiné à des non-juristes, a pour objet de décrire, dans ses grandes lignes, le régime juridique applicable à l'organisation et au fonctionnement de l'économie. Les liens avec des disciplines autres que le droit, notamment l'économie et l'histoire, seront privilégiés, afin d'adapter la matière aux besoins et centres d'intérêts d'étudiants en sciences humaines. Après une introduction générale, le cours s'articule autour de la trilogie fondamentale d'un système d'économie libérale tel qu'il existe aujourd'hui en Belgique et, plus largement, dans l'Union européenne: l'entreprise ; le marché et le risque. Le cours envisagera en effet les diverses modalités suivant lesquelles ces concepts sont traduits et utilisés dans le droit des affaires. D'abord, l'entreprise a reçu une première traduction juridique à travers la notion de commerçant, laquelle déclenche déjà l'application d'un grand nombre de règles (compétence des tribunaux de commerce ; modes de preuve particuliers ; droit de la faillite) ; cette traduction juridique s'est ultérieurement étendue à toutes les entités exerçant une activité économique. Parmi celles-ci, les sociétés commerciales retiendront tout particulièrement l'attention. Ensuite, l'organisation et le fonctionnement du marché font l'objet d'une deuxième partie : principe de la liberté du commerce et de l'industrie, droit de la concurrence, pratiques du commerce, ainsi qu'une introduction à l'organisation des marchés financiers et au fonctionnement des établissements financiers. Enfin, dans une troisième partie, le droit du concordat judiciaire et de la faillite sera analysé, en tant qu'instrument juridique de la sanction des défaillances des agents économiques et symbole du risque encouru par ceux qui font acte d'entreprendre. [less ▲]

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See detailThéories du droit
Thirion, Nicolas ULg

Learning material (2009)

L'enseignement de théorie du droit a pour objet de réaliser une approche du phénomène juridique s'appuyant sur un ensemble de concepts et de constructions puisés dans l'oeuvre foisonnante d'un des plus ... [more ▼]

L'enseignement de théorie du droit a pour objet de réaliser une approche du phénomène juridique s'appuyant sur un ensemble de concepts et de constructions puisés dans l'oeuvre foisonnante d'un des plus importants philosophes du vingtième siècle : Michel FOUCAULT. Il ne s'agit pas, bien entendu, de limiter le propos aux travaux de ce dernier, mais de s'en inspirer afin de fixer le cadre général d'une réflexion originale sur le droit. Dans une première partie, il conviendra de synthétiser l'appareillage intellectuel foucaldien pour en faire ensuite usage, dans la seconde partie - quantitativement la plus importante -, à propos de l'objet spécifique du cours : le phénomène juridique. Celle-ci vise en effet à appliquer les hypothèses présentées dans la première partie, en dissociant le droit comme pouvoir, d'une part, et le droit comme savoir, d'autre part. [less ▲]

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See detailDroit de l'entreprise
Thirion, Nicolas ULg; Pasteger, David ULg; Delvaux, Thierry et al

Learning material (2009)

Support écrit du cours de "droit de l'entreprise" à destination des étudiants de la troisième année du grade de bachelier en droit

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See detailMulti-aperture imaging of extrasolar planetary systems (invited review)
Absil, Olivier ULg

Scientific conference (2009, September 14)

Space‐based nulling interferometry has been identified since 1978 as a promising technique to detect and characterize extrasolar Earth‐like planets. In this talk, I will review the evolution of the ... [more ▼]

Space‐based nulling interferometry has been identified since 1978 as a promising technique to detect and characterize extrasolar Earth‐like planets. In this talk, I will review the evolution of the multi‐aperture concepts dedicated to Earth‐like planet imaging during the last 30 years, and discuss the future prospects in this field. In particular, I will describe the proposed architecture for the Darwin/TPF‐I mission, which has resulted from a common optimization effort by ESA and NASA and from various industrial studies during the past decade. The main scientific and technical hard points will be critically discussed. This talk will also review the precursor instruments (present and future) that could enable future flagship interferometric missions similar to Darwin/TPF‐I. [less ▲]

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See detailLa fiscalité locale : décennie d'évolutions
Bortolotti, Aurélien ULg

Scientific conference (2009, September 11)

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See detailFroment 2009: de bons rendements mais une piètre qualité boulangère
Sinnaeve, Georges; Gofflot, Sébastien; Chandelier, Anne et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2009, September 10)

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