A5021314576- biodegradable polymer synthesis and properties
- Advanced Polymer Synthesis and Characterization
- Carbon dioxide utilization in catalysis
- Silicone and Siloxane Chemistry
- Polymer Surface Interaction Studies
- Polymer Nanocomposites and Properties
- Polymer crystallization and properties
- Organometallic Complex Synthesis and Catalysis
- Synthetic Organic Chemistry Methods
- Microplastics and Plastic Pollution
- Organometallic Compounds Synthesis and Characterization
- Nanocomposite Films for Food Packaging
- Polymer composites and self-healing
- Conducting polymers and applications
- Electrospun Nanofibers in Biomedical Applications
- Biopolymer Synthesis and Applications
- Natural Fiber Reinforced Composites
- Fuel Cells and Related Materials
- Chemical Synthesis and Analysis
- Click Chemistry and Applications
- Photopolymerization techniques and applications
- Chemical Synthesis and Reactions
- Marine Biology and Environmental Chemistry
- Radioactive element chemistry and processing
- Innovative Microfluidic and Catalytic Techniques Innovation
University of Mons
2002-2011
Materia Nova
2006-2008
Vrije Universiteit Brussel
2008
Centre National de la Recherche Scientifique
2000-2005
Laboratoire de Chimie Organique
2005
GTx (United States)
2005
Polish Academy of Sciences
2003
University of Liège
1988-2003
École Polytechnique Fédérale de Lausanne
2002
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2002
Thermogravimetric analysis (TGA) simultaneously coupled with mass spectrometry (MS) and Fourier transform infrared (FTIR) was developed as an original technique to study the thermal modification/degradation of poly(ε-caprolactone) (PCL) through in depth evolved gas. Perfectly well-defined PCL samples controlled end groups, predictable molecular weight, narrow weight distribution were synthesized by living "coordination−insertion" ring-opening polymerization ε-caprolactone initiated aluminum...
Abstract Poly(lactide) (PLA), a biodegradable aliphatic polyester with excellent properties for different polymer applications, has been used mostly in the biomedical field, mainly because of its high price, resulting from expensive polymerization and purification techniques. Although this can play major role future markets polymers, current price to be reduced significantly at least $4 US/kg. Therefore, paper aims partially review techniques traditionally PLA synthesis propose new...
This article reports on the preparation and partial characterisation of silicone-based coatings filled with low levels either synthetic multiwall carbon nanotubes (MWCNTs) or natural sepiolite (NS). The antifouling fouling-release properties these were explored through laboratory assays involving representative soft-fouling (Ulva) hard-fouling (Balanus) organisms. bulk mechanical appeared unchanged by addition amounts filler, in contrast to surface properties, which modified exposure water....
The crystallization behavior of three double crystalline diblock copolymers containing poly(ε-caprolactone) and poly(p-dioxanone) has been studied via differential scanning calorimetry (DSC), polarized optical microscopy (POM), wide-angle X-ray scattering (WAXS). Crystallization melting temperatures enthalpies are compared among to those the corresponding homopolymers. Only one exotherm was observed for diblocks. DSC WAXS indicated that during isothermal PPDX crystallized first, followed by...
Abstract Poly( L ‐lactide)/layered aluminosilicate nanocomposites were synthesized in bulk by ring‐opening polymerization the presence of two organo‐modified montmorillonites. When organo‐modifier consisted an ammonium cation bearing primary hydroxyl groups, was initiated alcohol functions after adequate activation. The growing polymer chains directly “grafted” onto clay surface through hydroxyl‐functionalized cations yielding exfoliated with enhanced thermal stability. TEM image a fully...
The crystallization kinetics of each constituent poly(p-dioxanone)-b-poly(ε-caprolactone) diblock copolymers (PPDX-b-PCL) has been determined in a wide composition range by differential scanning calorimetry and compared to that the equivalent homopolymers. Spherulitic growth rates were also measured polarized optical microscopy while atomic force was employed reveal morphology one selected copolymer. It found drives structure formation both components form lamellae within mixed spherulitic...
The preparation and the characterization of nanotubes-reinforced poly(dimethyl)siloxane nanocomposites is reported. Surprisingly use "self pure" multiwall carbon nanotubes, that is, without any surface functionalization or specific treatment, turns out to be most efficient approach impart new key-properties silicone matrix.
The coordination−insertion ring-opening polymerization of ε-caprolactone was initiated from amine or hydroxyl groups spread over the surface silica (ca. 30 nm) cadmium sulfide 1.5 nanoparticles, respectively. initiation selectively occurred functional after activation into aluminum alkoxides species. covalent grafting polyester chains confirmed by solubilization nanoparticles in organic solvents, e.g., CHCl3 and THF for toluene CdS at least when surface-grafted PCL were long enough. In case...
Abstract Summary: Both intercalated and exfoliated poly( L , ‐lactide) (P( ‐LA)/organomodified montmorillonite nanocomposites were synthesized by in situ ring‐opening polymerization of ‐lactide, bulk, directly the presence nanofiller. Intercalation polyester chains was found to appear even for natural unmodified montmorillonite‐Na + while exfoliation occurred when aluminosilicate layers modified ammonium cations bearing primary hydroxyl groups. Clay delamination effectively triggered...
Abstract An experimental study was carried out to design polylactide (PLA)‐clay nanocomposites for developing fibers. PLA and 1–10 wt % of a selected organomodified bentonite (Bentone® 104‐B104) were melt mixed examine the effect processing conditions (temperature, shear, residence time) on morphology performed polymer (PNC). Because good compatibility with matrix, dispersion B104 occurred under different without difficulty, similar obtained. The results obtained showed that at low...
The combination of bioresorbable and biodegradable hydrophilic polysaccharides with hydrophobic polyester chains to form totally biodegradable, nonionic brushlike amphiphilic graft copolymers useful as surfactants has been investigated. In fact, a controlled original three-step procedure is described which gives access wide range poly(ε-caprolactone)-grafted dextran copolymer compositions. It consists the reversible protection hydroxyl groups polysaccharide backbone by silylation, followed...
Abstract The ring‐opening polymerization of lactides has been studied in bulk using either 2‐ethylhexanoic acid tin(II) salt, Sn(Oct) 2 , or aluminum triisopropoxide, Al(OiPr) 3 as the initiator over a wide range temperature and monomer‐to‐initiator molar ratio. A high increase rate observed when was added with an equimolar amount Lewis base, such triphenylphosphine (P(φ) ) 4‐picoline (C 6 H 7 N) to respectively. Melt stable polylactides molecular weight reasonably narrow distribution have...
Abstract Well‐defined amphiphilic PCL‐ b ‐PDMAEMA block copolymers were successfully synthesized by a combination of ATRP and “click” chemistry following either commutative two‐step procedure or straightforward one‐pot process using CuBr · 3Bpy as the sole catalyst. Compared to traditional coupling method, combining click even in “one‐pot” allows preparation diblock characterized narrow molecular weight distribution quantitative conversion azides alkynes into triazole functions. Moreover,...
Abstract The abiotic UV‐degradation behavior of oxodegradable LDPE was investigated in the presence thermoplastic pea starch (TPPS) this study. Oxodegradable first melt‐blended with using an internal mixing chamber to enhance oxidative degradation LDPE. Because their different affinity, maleated polyethylene added as compatibilizer. Tensile properties, thermal and morphology resulting melt‐blends were determined at content TPPS. High TPPS (40 wt %) could be readily without affecting tensile...
The ring-opening polymerization of L,L-lactide has been studied in bulk using 2-ethylhexanoic acid tin (II) salt, Sn(Oct)2, as a catalyst over wide range temperature and monomer to Sn(Oct)2 molar ratio. Although was known initiate fast polymerization, it is reported now that some Lewis bases, particularly triphenylphosphine (P(ϕ)3), can increase further the rate, without any detrimental effect on polylactide thermal stability. In order optimize balance between propagation competing...
Abstract Coupling atom transfer radical polymerization (ATRP) and coordination‐insertion ring‐opening (ROP) provided a controlled two‐step access to polymethacrylate‐ graft ‐polyaliphatic ester copolymers. In the first step, copolymerization of methyl methacrylate (MMA) 2‐hydroxyethyl (HEMA) was carried out at 80 °C high MMA concentration by using ethyl 2‐bromoisobutyrate [NiBr 2 (PPh 3 ) ] as initiator catalyst, respectively. Kinetic molar masses measurements, well 1 H NMR spectra analysis...