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Koulic C, Jérôme R. Nanostructured Polyamide by Reactive Blending. 1. Effect of the Reactive Diblock Composition. Macromolecules 2004. [DOI: 10.1021/ma035674j] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Müller R, Hrobarikova J, Calberg C, Jérôme R, Grandjean J. Structure and dynamics of cationic surfactants intercalated in synthetic clays. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:2982-2985. [PMID: 15835184 DOI: 10.1021/la0304058] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
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53
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Theunissen E, Overbergh N, Reynaers H, Antoun S, Jérôme R, Mortensen K. Silica reinforced triblock copolymer gels. POLYMER 2004. [DOI: 10.1016/j.polymer.2004.01.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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54
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Vangeyte P, Jérôme R. Amphiphilic block copolymers of high-molecular-weight poly(ethylene oxide) and either ε-caprolactone or γ-methyl-ε-caprolactone: Synthesis and characterization. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pola.11072] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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55
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Martin E, Dubois P, Jérôme R. Polymerization of ε-Caprolactone Initiated by Y Alkoxide Grafted onto Porous Silica. Macromolecules 2003. [DOI: 10.1021/ma025974l] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Maquet V, Boccaccini AR, Pravata L, Notingher I, Jérôme R. Preparation, characterization, and in vitro degradation of bioresorbable and bioactive composites based on Bioglass-filled polylactide foams. J Biomed Mater Res A 2003; 66:335-46. [PMID: 12889004 DOI: 10.1002/jbm.a.10587] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Highly porous poly(D,L-lactide)/Bioglass composites scaffolds were prepared by thermally induced phase separation process of polymer solutions and subsequent solvent sublimation. A series of composite foams with different polymer/Bioglass weight ratios was prepared to study the influence of Bioglass content on the foam characteristics such as porous structure, density, and pore volume. The pore volume was decreased from 9.5 to 5.7 cm(3)/g when the Bioglass content was increased up to 40 wt %, but the overall pore morphology was not affected very much by changing the polymer/glass composition ratio. The composites foams were then incubated in phosphate-buffered saline at 37 degrees C to study the in vitro degradation of the polymer and to detect hydroxyapatite (HA) formation as an indication of their bioactivity. The addition of Bioglass to polymer foams increased the water absorption and weight loss as compared with pure polymer foams. However, the polymer molecular weight, determined by size exclusion chromatography, was found to decrease more rapidly and to a larger extent in absence of Bioglass. This delayed degradation rate in the composite foams was probably caused by the dissolution of alkaline ions from the Bioglass, resulting in a buffering effect of the incubation medium. After incubation for 7 days, HA was detected by X-ray diffractometry and Raman spectroscopy and confirmed by environmental scanning electron microscopy and energy-dispersive X-ray analysis. The porous composites developed here are promising materials for bone regeneration applications because the formation of HA on the surface of the pore walls should provide good environment for the adhesion and proliferation of osteoblasts and osteoprogenitor cells.
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Martin E, Dubois P, Jérôme R. “In Situ” Formation of Yttrium Alkoxides: A Versatile and Efficient Catalyst for the ROP of ε-Caprolactone. Macromolecules 2003. [DOI: 10.1021/ma034236+] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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58
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Yin Z, Koulic C, Pagnoulle C, Jérôme R. Dependence of the interfacial reaction and morphology development on the functionality of the reactive precursors in reactive blending. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/masy.200350817] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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59
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Maquet V, Blacher S, Pirard R, Pirard JP, Vyakarnam MN, Jérôme R. Preparation of macroporous biodegradable poly(L-lactide-co-epsilon-caprolactone) foams and characterization by mercury intrusion porosimetry, image analysis, and impedance spectroscopy. J Biomed Mater Res A 2003; 66:199-213. [PMID: 12888989 DOI: 10.1002/jbm.a.10523] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Two poly(L-lactide-co-epsilon-caprolactone) random copolymers containing 5 and 40 mol % of epsilon-CL, namely P(LA-co-CL(5)) and P(LA-co-CL(40)), respectively, have been made macroporous by freeze-drying solutions in dimethylcarbonate. Most of the freeze-dried foams, prepared by varying polymer concentration and cooling rate, exhibited two main pore populations: (1). longitudinally oriented tube-like macropores with diameters >or=100 microm, and (2). interconnected micropores (10-100 microm). Pore characteristics, including macropore density, mean diameter, and interdistance, as well as micropore density, area, and shape, were determined by image analysis of scanning electron micrographs in order to study the influence of processing and formulation parameters on foam structure and properties. The pore orientation and the 3-D texture also were studied by image analysis and impedance spectroscopy. In the case of the P(LA-co-CL(5)), the macropore diameter increased with the cooling rate while the micropore diameter decreased. The micropores also became more circular when the cooling rate was increased. The pore size and morphology of the P(LA-co-CL(40)) were quite unchanged by varying the cooling rate. All the other conditions being the same, the P(LA-co-CL(5)) foams were better organized than the P(LA-co-CL(40)) foams, and pore orientation was improved at the higher cooling rate. Pore size and morphology also can be controlled by changing the polymer concentration (Cp), as we showed by studying P(LA-co-CL(5)) foams prepared by freeze-drying solutions in the 1-10 w/v % Cp range. Macropore density, average diameter, and interdistance of P(LA-co-CL(5)) foams increased with Cp, but the micropore characteristics remained almost unchanged no matter the Cp. The reliability of the characterization methods has been discussed, with special attention to mercury intrusion porosimetry, which is used primarily for measurement of pore volume and pore size distribution. However, this technique is reported here as a destructive and unreliable method for the characterization of fragile P(LA-co-CL(40)) foams. This study shows that image analysis and impedance spectroscopy can give reliable information relative to the pore morphology and anisotropy of freeze-dried foams.
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Claes M, Voccia S, Detrembleur C, Jérôme C, Gilbert B, Leclère P, Geskin VM, Gouttebaron R, Hecq M, Lazzaroni R, Jérôme R. Polymer Coating of Steel by a Combination of Electrografting and Atom-Transfer Radical Polymerization. Macromolecules 2003. [DOI: 10.1021/ma0217130] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Boccaccini AR, Notingher I, Maquet V, Jérôme R. Bioresorbable and bioactive composite materials based on polylactide foams filled with and coated by Bioglass particles for tissue engineering applications. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2003; 14:443-450. [PMID: 15348448 DOI: 10.1023/a:1023266902662] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Poly(DL-lactide) (PDLLA) foams and bioactive glass (Bioglass) particles were used to form bioresorbable and bioactive composite scaffolds for applications in bone tissue engineering. A thermally induced phase separation process was applied to prepare highly porous PDLLA foams filled with 10 wt % Bioglass particles. Stable and homogeneous layers of Bioglass particles on the surface of the PDLLA/Bioglass composite foams as well as infiltration of Bioglass particles throughout the porous network were achieved using a slurry-dipping technique. The quality of the bioactive glass coatings was reproducible in terms of thickness and microstructure. In vitro studies in simulated body fluid (SBF) were performed to study the formation of hydroxyapatite (HA) on the surface of the PDLLA/Bioglass composites, as an indication of the bioactivity of the materials. Formation of the HA layer after immersion in SBF was confirmed by X-ray diffraction and Raman spectroscopy measurements. The rate of HA formation in Bioglass-coated samples was higher than that observed in non-coated samples. SEM analysis showed that the HA layer thickness rapidly increased with increasing time in SBF in the Bioglass-coated samples. The high bioactivity of the developed composites suggests that the materials are attractive for use as bioactive, resorbable scaffolds in bone tissue engineering.
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Blacher S, Maquet V, Schils F, Martin D, Schoenen J, Moonen G, Jérôme R, Pirard JP. Image analysis of the axonal ingrowth into poly(D,L-lactide) porous scaffolds in relation to the 3-D porous structure. Biomaterials 2003; 24:1033-40. [PMID: 12504525 DOI: 10.1016/s0142-9612(02)00423-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Porous polymer scaffolds are promising materials for neural tissue engineering because they offer valuable three-dimensional (3-D) supports for the in vitro and in vivo axonal growth and tissue expansion. At the time being, how the in vivo neuronal cell development depends on the scaffold 3-D architecture is unknown. Therefore, scanning electron micrographs of longitudinal sections of porous polylactide scaffolds and immunohistological sections of these scaffolds after implantation and neurofilament staining have been studied by image analysis. Pore orientation and axonal ingrowth have been investigated by spectral analysis on gray level SEM images. Binary image processing has been carried out and the binary images have been studied by spectral analysis in order to estimate the possible effect of the image noise on the real pattern. In addition to axonal orientation, density and length distribution of the regenerated axons into the polymer scaffold have been measured. Dependence of the axonal ingrowth on the 3D-polymer scaffold has been discussed on the basis of the collected data.
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63
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Leroy D, Martinot L, Mignonsin P, Strivay D, Weber G, Jérôme C, Jérôme R. Complexation of uranyl ions by polypyrrole doped by sulfonated and phosphonated polyethyleneimine. J Appl Polym Sci 2003. [DOI: 10.1002/app.12028] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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64
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Rharbi Y, Zhang JX, Spiro JG, Chen L, Winnik MA, Vavasour JD, Whitmore MD, Jérôme R. An Energy Transfer Study of Homopolymer Localization in Block Copolymers. Macromolecules 2003. [DOI: 10.1021/ma020962l] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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65
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Jérôme C, Gabriel S, Voccia S, Detrembleur C, Ignatova M, Gouttebaron R, Jérôme R. Preparation of reactive surfaces by electrografting. Chem Commun (Camb) 2003:2500-1. [PMID: 14587751 DOI: 10.1039/b307728d] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrografting process has been applied to a new monomer in order to induce reactivity to the surface of various conducting substrates which are then appropriate for the anchoring of a large variety of molecules (catalysts, proteins, amino-polymers etc.).
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66
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67
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Harrats C, Fayt R, Jérôme R, Blacher S. Stabilization of a cocontinuous phase morphology by a tapered diblock or triblock copolymer in polystyrene-rich low-density polyethylene/polystyrene blends. ACTA ACUST UNITED AC 2002. [DOI: 10.1002/polb.10370] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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68
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Roether JA, Gough JE, Boccaccini AR, Hench LL, Maquet V, Jérôme R. Novel bioresorbable and bioactive composites based on bioactive glass and polylactide foams for bone tissue engineering. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2002; 13:1207-1214. [PMID: 15348667 DOI: 10.1023/a:1021166726914] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Bioresorbable and bioactive tissue engineering scaffolds based on bioactive glass (45S5 Bioglass(R)) particles and macroporous poly(DL-lactide) (PDLLA) foams were fabricated. A slurry dipping technique in conjunction with pretreatment in ethanol was used to achieve reproducible and well adhering bioactive glass coatings of uniform thickness on the internal and external surfaces of the foams. In vitro studies in simulated body fluid (SBF) demonstrated rapid hydroxyapatite (HA) formation on the surface of the composites, indicating their bioactivity. For comparison, composite foams containing Bioglass(R) particles as filler for the polymer matrix (in concentration of up to 40 wt %) were prepared by freeze-drying, enabling homogenous glass particle distribution in the polymer matrix. The formation of HA on the composite surfaces after immersion in phosphate buffer saline (PBS) was investigated to confirm the bioactivity of the composites. Human osteoblasts (HOBs) were seeded onto as-fabricated PDLLA foams and onto PDLLA foams coated with Bioglass(R) particles to determine early cell attachment and spreading. Cells were observed to attach and spread on all surfaces after the first 90 min in culture. The results of this study indicate that the fabricated composite materials have potential as scaffolds for guided bone regeneration.
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69
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Yin Z, Koulic C, Jeon HK, Pagnoulle C, Macosko CW, Jérôme R. Effect of Molecular Weight of the Reactive Precursors in Melt Reactive Blending. Macromolecules 2002. [DOI: 10.1021/ma0206366] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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70
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Yin Z, Koulic C, Pagnoulle C, Jérôme R. Controlled synthesis of anthracene-labeled -amine polystyrene to be used as a probe for interfacial reaction with mutually reactive PMMA. MACROMOL CHEM PHYS 2002. [DOI: 10.1002/1521-3935(200210)203:14<2021::aid-macp2021>3.0.co;2-a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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71
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Harrats C, Fayt R, Jérôme R. Synthesis and compatibilization ability of hydrogenated polybutadiene-b-polyamide 6 diblock copolymer in low density polyethylene and polyamide 6 blends. POLYMER 2002. [DOI: 10.1016/s0032-3861(02)00363-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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72
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Detrembleur C, Sciannamea V, Koulic C, Claes M, Hoebeke M, Jérôme R. Controlled Nitroxide-Mediated Radical Polymerization of Styrene, Styrene/Acrylonitrile Mixtures, and Dienes Using a Nitrone. Macromolecules 2002. [DOI: 10.1021/ma0201835] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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73
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Hamitou A, Jérôme R, Hubert AJ, Teyssié P. A New Catalyst for the Living Polymerization of Lactones to Polyesters. Macromolecules 2002. [DOI: 10.1021/ma60034a035] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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74
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Broze G, Lefèbvre PM, Jérôme R, Teyssiè P. Block Copolymerization of 3,3-Dimethyl-2-oxetanone. 1. About the Mechanism of α,α-Disubstituted β-Propiolactones Block Copolymerization. Macromolecules 2002. [DOI: 10.1021/ma60072a006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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75
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Detrembleur C, Teyssié P, Jérôme R. Control of the Radical Polymerization of tert-Butyl Methacrylate in Water by a Novel Combination of Sodium Nitrite and Iron(II) Sulfate. Macromolecules 2002. [DOI: 10.1021/ma011368z] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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