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See detailPolymeric Micelles Induced by Interpolymer Complexation
Lefèvre, Nathalie ULg; Fustin, Charles-André; Gohy, Jean-François

in Macromolecular Rapid Communications (2009), 30(22), 1871-88

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See detailPolymeric microparticles with immobilized peptides. Preparation and application.
Stashevskaya, K; Markvicheva, E; Grandfils, Christian ULg et al

Poster (2005, February 07)

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See detailPolymeric nanomaterials – synthesis, functionalization and applications in diagnosis and therapy
Rieger, Jutta ULg; Jérôme, Christine ULg; Jérôme, Robert ULg et al

in Kumar, Challa (Ed.) Nanomaterials for Medical Diagnosis and Therapy (2007)

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See detailPolymerisation of inverse microemulsion : application to enzyme immobilization
Lebon, F; Grandfils, Christian ULg; Jérôme, Robert ULg

Conference (2001, July 15)

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See detailPolymérisation radicalaire contrôlée par des complexes de cobalt (CMRP) : Mécanismes et ingénierie macromoléculaire.
Debuigne, Antoine ULg

Scientific conference (2010, May 12)

De nos jours, les avancées dans de nombreux domaines technologiques sont conditionnées par le développement de matériaux polymères possédant des structures et propriétés bien définies. Dans ce contexte ... [more ▼]

De nos jours, les avancées dans de nombreux domaines technologiques sont conditionnées par le développement de matériaux polymères possédant des structures et propriétés bien définies. Dans ce contexte, nous développons une méthode de polymérisation radicalaire contrôlée assistée par des complexes de cobalt(II) (CMRP) et basée sur la désactivation temporaire des chaînes radicalaires par le métal. Outre le mécanisme de la CMRP, nous aborderons son potentiel en ingénierie macromoléculaire, notamment pour la synthèse de copolymères séquencés et la fonctionnalisation des polymères en tirant profit de la réactivité spécifique des composés organométalliques qui coiffent les chaînes. Les résultats obtenus à l’aide de complexes de cobalt seront mis en perspective avec des études mettant en jeu d’autres métaux (Ti, V, Cr). [less ▲]

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See detailPolymerization in Inverse Microemulsion: An Effective Tool to Produce Biodegradable and non Biodegradable Nanoparticles
Lebon, F; Grandfils, Christian ULg; Jérôme, Robert ULg et al

in Proceedings of Material Research Society (MRS) (2002)

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See detailPolymerization method of polymer compound by in situ polymerization of monoethylenically unsaturated monomer and secondary amine
Detrembleur, Christophe ULg; Gross, Thomas; Meyer, Rolf-Volker

Patent (2004)

Provided is a method for preparing a polymer compound selected from the group consisting of an oligomer, a cooligomer, a polymer and a copolymer without using an additional free radical initiator ... [more ▼]

Provided is a method for preparing a polymer compound selected from the group consisting of an oligomer, a cooligomer, a polymer and a copolymer without using an additional free radical initiator. CONSTITUTION: The method comprises the steps of mixing at least one monoethylenically unsaturated monomer represented by HR1C=CR2R3, at least one oxidant and at least one secondary amine represented by the formula 2; and heating the mixture at a polymerization temperature of 0-220 deg.C, wherein R1, R2 and R3 are independently H, a C1-C20 alkyl group, a C1-C20 cycloalkyl group, a C6-C24 aryl group, a halogen atom, a cyano group, a C1-C20 alkyl ester group, a C1-C20 cycloalkyl ester group, a C1-C20 alkylamide group, a C1-C20 cycloalkylamide group, a C6-C24 aryl ester group or a C6-C24 arylamide group; R4 and R5 are independently a C1-C18 alkyl group, a C2-C18 alkenyl group, a C2-C18 alkynyl group, a C3-C12 cycloalkyl group, a C3-C12 hetero cycloalkyl group, a C6-C24 aryl group or a C4-C12 alkanol group; and R4 and R5 can form a C2-C13 hetero cycloalkyl residue containing O, S or N together with a nitrogen atom connecting them, or a polycyclic ring-based or polycyclic heterocycloaliphatic ring-based residue containing O, S or N, and in the each case the carbon atom of the radical next to the nitrogen atom is substituted with two or three additional organic substituents. [less ▲]

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See detailPolymerization of (L,L)-lactide and copolymerization with epsilon-caprolactone initiated by dibutyltin dimethoxide in supercritical carbon dioxide
Stassin, Fabrice; Jérôme, Robert ULg

in Journal of Polymer Science. Part A, Polymer Chemistry (2005), 43(13), 2777-2789

Ring-opening polymerization (ROP) of (L,L)-lactide (LA) has been initiated by dibutyltin dimethoxide in supercritical carbon dioxide (SC CO2). Polymerization is controlled and proceeds at quasi the same ... [more ▼]

Ring-opening polymerization (ROP) of (L,L)-lactide (LA) has been initiated by dibutyltin dimethoxide in supercritical carbon dioxide (SC CO2). Polymerization is controlled and proceeds at quasi the same rate as in toluene, which indicates that the reactivity of the propagating species is not impaired by parasitic carbonation reaction. Random copolymerization of LA with P-caprolactone (CL) has also been studied in sc CO2, and the reactivity ratios have been determined as 5.8 +/- 0.5 for LA and 0.7 +/- 0.25 for CL. These values have to be compared to 0.7 +/- 0.25 for LA and 0.15 +/- 0.05 for CL in toluene. Good control on ROP of CL and LA in SC CO2 has been confirmed by the successful synthesis of diblock copolymers by sequential polymerization of CL and LA. [less ▲]

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See detailPolymerization of epsilon-caprolactone initiated by Y alkoxide grafted onto porous silica
Martin, Eric; Dubois, Philippe ULg; Jérôme, Robert ULg

in Macromolecules (2003), 36(19), 7094-7099

Ring-opening polymerization of c-caprolactone has been initiated by Y isopropoxide grafted onto silica, in the presence of 2-propanol, in toluene at 40degreesC. The degree of polymerization is controlled ... [more ▼]

Ring-opening polymerization of c-caprolactone has been initiated by Y isopropoxide grafted onto silica, in the presence of 2-propanol, in toluene at 40degreesC. The degree of polymerization is controlled by the initial monomer/(alcohol + alkoxide) molar ratio. Deactivation of the chains by an alcohol is essential for them to be detached from the support and to be collected totally free of metal and silica residues. The alkoxide is also regenerated at the surface of the support, which allows for recycling the catalyst. [less ▲]

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See detailPolymerization of ortho-Substituted Phenylacetylenes with Well-Defined Ruthenium-Alkylidene Catalysts and Related Metathesis Initiators
Katsumata, T.; Shiotsuki, M.; Sanda, F. et al

in Macromolecular Chemistry And Physics (2009), 210(22), 1891-1902

The polymerization of (2-isopropoxyphenyl)acetylene was investigated using a wide range of well-defined ruthenium-alkylidene complexes and related olefin metathesis initiators. In view of its superior ... [more ▼]

The polymerization of (2-isopropoxyphenyl)acetylene was investigated using a wide range of well-defined ruthenium-alkylidene complexes and related olefin metathesis initiators. In view of its superior activity, the second generation Hoveyda-Grubbs catalyst was singled out for further studies. Only phenylacetylenes ortho-substituted with alkoxy, ester, fluoro, and silyl groups afforded polymers with moderate molecular weights. They were characterized by various analytical techniques, and their properties were pared with those of samples prepared using Rh and W initiators. The Ru-based polymers possessed high trans contents and took a helical conformation with predominantly one-handed screw sense when chiral side-chains were present. [less ▲]

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See detailPolymerization of β-butyrolactone initiated with Al(OiPr)3
Kurcok, Piotr; Dubois, Philippe ULg; Jérôme, Robert ULg

in Polymer International (1996), 41(4), 479-485

Polymerization of gamma-butyrolactone has been studied in toluene with Al(OiPr)3 as an initiator. The ring-opening polyaddition proceeds through a coordination-insertion mechanism at a very low rate. Well ... [more ▼]

Polymerization of gamma-butyrolactone has been studied in toluene with Al(OiPr)3 as an initiator. The ring-opening polyaddition proceeds through a coordination-insertion mechanism at a very low rate. Well defined -isopropylester, -hydroxy poly(-butyrolactone)s (PBL) are formed with a narrow molecular weight distribution at low monomer-to-initiator molar ratios, When this ratio is higher (ca. 170), a competition occurs between propagation and side reactions, i.e. elimination, inter- and intra-molecular transesterifications and thermal degradation, which is responsible for a loss of control of the PBL molecular charcteristics. The addition of a Lewis base (1 equivalent of nicotine/Al) to the Al-alkoxide initiator has no significant effect on the polymerization rate, although the chain microstructure is deeply affected since predominantly syndiotactic PBL chains are formed (63% syndio-diads) in contrast to a completely atactic polymer in the absence of nicotine. [less ▲]

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See detailPolymerization-filled composites and nanocomposites by coordination catalysis
Dubois, Philippe ULg; Alexandre, Michaël ULg; Jérôme, Robert ULg

in Macromolecular Symposia (2003), 194

Polyolefinic microcomposites and layered silicate nanocomposites were prepared by the in-situ polymerization of ethylene (and alpha-olefin) via the so-called polymerization-filling technique. Various ... [more ▼]

Polyolefinic microcomposites and layered silicate nanocomposites were prepared by the in-situ polymerization of ethylene (and alpha-olefin) via the so-called polymerization-filling technique. Various tillers with either basic, acidic, metallic or carbonaceous surface, as well as non-modified clays such as montmorillonite and hectorite, were first treated by trimethylaluminum-depleted methylaluminoxane before being contacted by a titanium or zirconium-based metallocene catalyst. The (nano)composite was formed by addition and polymerization of ethylene (and alpha-olefin). This technique makes possible the complete encapsulation of every filler particle within the (co)polyolefinic matrix ranging from thermoplastics to elastomers. The so-obtained (nano)composites, often coined as "homogeneous" (nano)composites, exhibit improved mechanical properties; as compared to more conventional melt blends for a same filler content. [less ▲]

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See detailPolymerization-filled composites prepared with highly active filler-supported Al/Ti/Mg catalysts. I. Synthesis of homogeneous polyethylene-based composites
Hindryckx, François; Dubois, Philippe; Jérôme, Robert ULg et al

in Journal of Applied Polymer Science (1997), 64(3), 423-438

When it is attached onto the surface of an inorganic filler (kaolin, barite), the (BuO)4Ti/BuMgOct/EtAlCl2/Et3Al system is a highly efficient and very promising catalyst for the production of high ... [more ▼]

When it is attached onto the surface of an inorganic filler (kaolin, barite), the (BuO)4Ti/BuMgOct/EtAlCl2/Et3Al system is a highly efficient and very promising catalyst for the production of high-performance polyethylene-based composites. The surface concentration of the hydroxyl groups, the Al/Ti/Mg ratio, and the purity of the reagents have a major effect on the catalyst efficiency and molecular weight, crystallinity, and physico-mechanical properties of the final composite. Under ca. 4 bar partial pressure of ethylene in heptane at 60°C, the optimum Al/Ti/Mg catalyst composition is 120/0.75/10, the efficiency of which is as high as 300 kgPE/(gTi × h) in the presence of kaolin particles (Satintone W/W). The effect of transfer agents, such as hydrogen and 1-octene, and purity of the -olefin has been investigated. Actually, the catalyst efficiency is increased in the presence of both hydrogen and octene. Scanning Electron Microscopy (SEM) has shown that the ethylene was polymerized from the filler surface. Special attention has also been paid to the effect of size, density, and surface acidity of the filler particles. The surface of basic filler has to be treated in order to become an efficient catalyst carrier. [less ▲]

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See detailPolymerization-filled composites prepared with highly active filler-supported Al/Ti/Mg catalysts. II. Properties of homogeneous polyethylene-based
Hindryckx, François; Dubois, Philippe; Jérôme, Robert ULg et al

in Journal of Applied Polymer Science (1997), 64(3), 439-454

Polyethylene-based composites have been prepared by ethylene polymerization with a Al/Ti/Mg catalyst previously deposited on the surface of kaolin (Satintone W/W and Satintone 5) or barite.(1) Molecular ... [more ▼]

Polyethylene-based composites have been prepared by ethylene polymerization with a Al/Ti/Mg catalyst previously deposited on the surface of kaolin (Satintone W/W and Satintone 5) or barite.(1) Molecular weight (M(w)) of the polyethylene matrix has been estimated from melt viscosity under steady shear flow and compared to the value measured by size exclusion chromatography. Tensile stress and strain, Young modulus, and impact energy have been measured in relation to the matrix molecular weight and the filler content. The effect of the main polymerization parameters, such as the Al/Ti/Mg composition, the addition of a transfer agent, e.g., an alpha-olefin or hydrogen, have also been investigated. These tensile and impact properties have been compared to composites of the same composition but prepared by melt blending of the filler and the preformed polyolefin. As a rule, the polymerization-filled composites have an improved mechanical strength compared to the analogues prepared by melt blending. [less ▲]

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See detailPolymerization-filling technique: an efficient way to improve the mechanical properties of polyethylene composites
Alexandre, Michaël ULg; Martin, Eric; Dubois, Philippe ULg et al

in Chemistry of Materials (2001), 13(2), 236-237

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See detailPolymers in modern ophthalmic implants—Historical background and recent advances
Bozukova, Dimitriya; Pagnoulle, Christophe; Jérôme, Robert ULg et al

in Materials Science & Engineering : R (2010), 69(6), 63-83

Cataract surgery is the most frequently performed surgical intervention, pursued by replacement of the opacified natural lens by a polymeric intraocular lens (IOL). This paper, based on an exhaustive ... [more ▼]

Cataract surgery is the most frequently performed surgical intervention, pursued by replacement of the opacified natural lens by a polymeric intraocular lens (IOL). This paper, based on an exhaustive number of scientific references, provides a brief simplified discussion of the surgical advances for cataract treatment, and is mainly focused on the process of IOL discovery, engineering and development. The performances of the polymer materials, used for the IOLs fabrication are discussed in a comparative way, and their properties, such as handling during surgery, biocompatibility, rate of some post-surgical complications (e.g. Posterior Capsular Opacification) and optical properties, are considered. Special attention is paid on the basic scientific approaches for engineering and modification of the IOL surface and bulk properties. Polymer coating techniques like ‘grafting onto’ and ‘grafting from’ are discussed and exemplified by a variety of coating compositions and performances. In another part of the review, modification techniques concerning optimization of the bulk properties of the polymer lens are also discussed and synthetic approaches such as copolymerization and nanocomposite formation are considered. A perspective aspect of this discussion concerns improvement of the performance of the main polymer by the incorporation of in situ formed or preformed nanoparticles. The most attractive perspectives concerning the improvement of the IOL properties by chemical modification approaches are described. [less ▲]

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