Laboratoire Of Chimie Macromoleculaire

Bordj el Kiffan, Algeria

Laboratoire Of Chimie Macromoleculaire

Bordj el Kiffan, Algeria

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Sakhri A.,University of Science and Technology Houari Boumediene | Perrin F.X.,University of Toulon | Aragon E.,University of Toulon | Lamouric S.,Laboratoire Of Chimie Macromoleculaire | Benaboura A.,University of Science and Technology Houari Boumediene
Corrosion Science | Year: 2010

The anticorrosion performance of plasticized chlorinated rubber coated mild steel sheets incorporating polyaniline emeraldine salt or zinc phosphate as active pigments were compared using salt spray and immersion in 3.5% NaCl solution. The results obtained by different electrochemical methods indicate the superiority of polyaniline in comparison with zinc phosphate in terms of corrosion protection. The time of the emergence of the first rust spot in 3.5% NaCl solution for the film containing 1.5 wt% polyaniline reach 960 h, which is six times higher than that of the film without polyaniline. The protective mechanism by zinc phosphate and polyaniline pigments were discussed. © 2009 Elsevier Ltd. All rights reserved.


Sayhi M.,University of Science and Technology Houari Boumediene | Haine N.,University of Science and Technology Houari Boumediene | Belaabed B.,Ecole Superieure des Techniques de lAeronautique | Lamouri S.,Laboratoire Of Chimie Macromoleculaire | Vigneras V.,French National Center for Scientific Research
Journal of Macromolecular Science, Part B: Physics | Year: 2015

Conducting polymer blends were prepared using polyaniline doped with para- toluene sulfonic acid (PTSA-PANI) and a polyester polyol-based polyurethane (PU). The morphological, thermal and dielectric properties of the PTSA-PANI/PU blends in the frequency range of 1-5 GHz (S band) were investigated. It was found that the morphology of the samples was affected by the PTSA-PANI loading, resulting in the formation of agglomerates and pathways when above 10 wt%. The thermal stability of the composites was improved with increased PTSA-PANI loading. The electrical conductivity percolation threshold was obtained at 2.5% of PTSA-PANI loading and the electrical conductivity reached the value of 0.13 S/m at a PTSA-PANI loading of 30 wt%. The obtained results for the PTSA-PANI/PU blends prepared indicate a high potential for their successful use in electrical and electromagnetic applications. © 2015 Copyright © Taylor and Francis Group, LLC.


Belaabed B.,Laboratoire Of Chimie Macromoleculaire | Wojkiewicz J.L.,University of Lille Nord de France | Wojkiewicz J.L.,Ecole Des Mines de Douai | Lamouri S.,Laboratoire Of Chimie Macromoleculaire | And 3 more authors.
Journal of Alloys and Compounds | Year: 2012

Hybrid organic/inorganic electromagnetic absorbing materials (EMAMs) based on polyaniline (PANI) and magnetite (Fe 3O 4) fillers dispersed in epoxy resin matrix were successfully prepared for electromagnetic applications. The effects of PANI and Fe 3O 4 loading on permittivity, permeability and microwave absorption properties were studied. The structure and the morphology of the elaborated composites were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Electromagnetic properties and absorbing behaviors were performed over frequency range of 12.4-18 GHz (Ku-band). The results show that synthesis parameters such as amount and particle size of PANI and used Fe 3O 4 affect significantly the morphology, the conductivity, and the microwave absorption properties of the final materials. It was revealed that the electromagnetic parameters were higher in hybrid PANI/magnetite/epoxy resin than in dielectric PANI/epoxy resin composites. The permittivity and the permeability parameters increased to high values with the rate of fillers in the composite and remained constant with the frequency. A minimum reflection coefficient (RC) of -42 dB was observed at 16.3 GHz with a thickness around 1 mm for composites containing 15% of PANI and 10% of Fe 3O 4 (ε′ = 10) and -37.4 dB at 14.85 GHz for the composite of 15% of PANI and 25% of Fe 3O 4 (ε′ = 17) . However, a composite made with only 20% of PANI (ε′ = 8.5) showed a minimum reflection coefficient of -11 dB at 18 GHz with the same thickness. The possibility to modulate the electromagnetic properties of the composite materials is of a great interest to fabricate microwave absorbing and electromagnetic shielding materials with high performances. © 2011 Elsevier Ltd. All rights reserved.


Belaabed B.,Laboratoire Of Chimie Macromoleculaire | Wojkiewicz J.L.,University of Lille Nord de France | Wojkiewicz J.L.,Ecole Des Mines de Douai | Lamouri S.,Laboratoire Of Chimie Macromoleculaire | And 4 more authors.
Polymers for Advanced Technologies | Year: 2012

Composites based on conductive organic/inorganic fillers dispersed in insulating matrix have been widely investigated because of their widespread applications such as electromagnetic shielding, electrostatic discharge, and sensors. In this context, novel composite materials based on epoxy resin matrix charged with polyaniline (PANI)-doped para-toluene sulfonic acid were elaborated. Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy were used to check the structure and the morphology of the samples. Viscoelastic behavior and thermal stability of the composites were explored by dynamic mechanical thermal analysis and thermogravimetric analysis. It was shown that the PANI particles exhibited a partial crystalline structure and were homogeneously dispersed in epoxy matrix. Consequently, this structure affected the thermal stability and viscoelastic properties of the composites. Furthermore, the dielectric and electrical properties were investigated up to 1MHz. Measurements of dielectric properties revealed that with loading fillers in matrix, the dielectric parameters increased to high values at low frequency then decreased at values around 40 and 32 of real and imaginary parts, respectively, at 1MHz with 15% of PANI content. © 2011 John Wiley & Sons, Ltd.


Kherroub D.E.,Oran University of Science and Technology - Mohamed Boudiaf | Belbachir M.,Oran University of Science and Technology - Mohamed Boudiaf | Lamouri S.,Laboratoire Of Chimie Macromoleculaire
Oriental Journal of Chemistry | Year: 2014

The aim of this work is to obtain an organophilic montmorillonite with Algerian modified clay (termed 12-maghnite). The organic surfactant used in this preparation is 12-aminolauric acid. The functionalization of the organophilic clay was confirmed by infrared spectroscopy (IR). The obtained organoclay was characterized by X-ray diffraction (XRD) which shows a remarkable increase of the basal distance that reaches up to 17.62 Å. The transmission electron microscopy analysis (TEM) supports fully the result obtained by XRD analysis. The novelty of this work is the exploitation of local clay that is widely available, inexpensive and has excellent properties and high quality features, which make it the subject of continuing research. These results will be a starting point and an essential reference for a comparative study, with the results of future works concerning the synthesis of Polymer/12-Maghnite nanocomposites. © 2014, Oriental Scientific Publishing Company. All rights reserved.


Kherroub D.E.,Oran University of Science and Technology - Mohamed Boudiaf | Belbachir M.,Oran University of Science and Technology - Mohamed Boudiaf | Lamouri S.,Laboratoire Of Chimie Macromoleculaire
Research on Chemical Intermediates | Year: 2015

Nylon 6/clay nanocomposites [1, 3, 5, and 10 % (w/w) 12-maghnite based on the ε-caprolactam content] were synthesized by in situ polymerization. 12-maghnite is a montmorillonite silicate sheet clay was prepared through a straightforward exchange process, using a green natural clay from Maghnia (west of Algeria). Fourier transform infrared spectroscopy confirmed the formation of nylon 6. X-ray diffraction and transmission electron microscopy revealed that the modified montmorillonite layers were uniformly dispersed and exfoliated in the nylon 6 matrix for low levels of clay, while intercalated structures and immiscible regions were detected for high levels. Thermogravimetric analysis revealed that the thermal properties of nylon 6/clay nanocomposites were enhanced with increasing 12-maghnite levels (>500°C). Additionally, the nanocomposites showed a remarkable improvement in their mechanical properties compared to pure polymer. © 2014 Springer Science+Business Media.


Zeghina S.,Laboratoire Of Chimie Macromoleculaire | Wojkiewicz J.-L.,University of Lille Nord de France | Wojkiewicz J.-L.,Sage | Lamouri S.,Laboratoire Of Chimie Macromoleculaire | And 3 more authors.
Journal of Applied Polymer Science | Year: 2014

Polymer blends based on nanostructured polyaniline (PANI) doped with hydrochloric acid (HCl) and para-toluene sulfonic acid (PTSA) introduced into aliphatic polyurethane matrix (PU) are synthesized to produce flexible thin composite films for microwave absorbers. The effects of dopant type, PANI content and film thickness on morphologies, dielectric and microwave absorption properties in the X-band are studied. It reveals that real and imaginary parts of the complex permittivity are proportional to filler concentrations and type of doped PANI. The PANI-PTSA/PU films show higher permittivity and better microwave absorbing properties than PANI-HCl/PU for the same weight fraction of PANI. The minimum reflection loss RL(dB) values for the PANI-PTSA/PU are -37 dB at (20% PANI and 11.6 GHz) and -30 dB at (15% PANI and 11.3 GHz) for thicknesses of 1.2 and 1.6 mm, respectively. These high values of reflection losses make the obtained lightweight and flexible composites promising radar absorbing materials (RAM). © 2014 Wiley Periodicals, Inc.


Kherroub D.E.,Université Ibn Tofail | Belbachir M.,Université Ibn Tofail | Lamouri S.,Laboratoire Of Chimie Macromoleculaire
Bulletin of Chemical Reaction Engineering and Catalysis | Year: 2014

The ring opening bulk polymerization of e-caprolactam catalyzed by Maghnite-H+ was reported. Ma-ghnite-H+ is a montmorillonite silicate sheet clay was prepared through a straight forward proton ex-change process. The effect of the amount of catalyst, and temperature was studied. Increasing Magh-nite-H+ proportion and temperature produced the increase in ε-caprolactam conversion. The kinetics indicated that the polymerization rate is first order with respect to monomer concentration. Mecha-nism studies showed that monomer inserted into the growing chains with the acyl-oxygen bond scis-sion rather than the break of alkyl-nitrogen bond. © 2014 BCREC UNDIP.


Kherroub D.E.,Université Ibn Tofail | Belbachir M.,Université Ibn Tofail | Lamouri S.,Laboratoire Of Chimie Macromoleculaire | Bouhadjar L.,Université Ibn Tofail | Chikh K.,Université Ibn Tofail
Oriental Journal of Chemistry | Year: 2013

The purpose of this study was to obtain polyamide-6 nanocomposites with national organically modified clay (termed 12-montmorillonite). The formation of polyamide-6 was confirmed by infrared spectroscopy (IR), the prepared nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The evolution of mechanical properties was also studied. The obtained results confirm the intercalation of molecules of salt in the clay layers, and a good interaction with the polymer, showing the formation of intercalated and/or partially exfoliated structures. The nanocomposites showed higher thermal stability compared to pure polymer, and the mechanical properties presented interesting and promising results.

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