Institute of Nanomaterials and Nanotechnologies NANOTECH

Rabat, Morocco

Institute of Nanomaterials and Nanotechnologies NANOTECH

Rabat, Morocco

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El Achaby M.,Institute of Nanomaterials and Nanotechnologies NANOTECH | El Achaby M.,Mohammed V University | Arrakhiz F.Z.,Institute of Nanomaterials and Nanotechnologies NANOTECH | Arrakhiz F.Z.,Mohammed V University | And 6 more authors.
Journal of Applied Polymer Science | Year: 2013

Nanocomposites of poly(vinylidene fluoride) (PVDF) with chemically reduced graphene nanosheets (GNs) were prepared by melt mixing method and their structure and morphology characterized by SEM analysis. The addition of GNs in the PVDF matrix resulted in changes of the crystallization and melting behaviors. Furthermore, increasing GNs content led to improved thermal stability of the PVDF nanocomposites in air and nitrogen, as well as significant increase in tensile and flexural properties. The nanocomposites' rheological behavior is also affected by the GNs' content. Using oscillatory rheology to monitor the GNs' dispersion, it was found that as the GNs loading increase, the Newtonian behavior disappears at low frequency. This suggests a viscoelastic behavior transition from liquid-like to solid-like, with greater GNs content and more homogeneous dispersion resulting in a stronger solid-like and nonterminal behavior. By using the melt mixing method to disperse GNs, the properties of PVDF are enhanced due to the better dispersion and distribution of GNs throughout the matrix. This improvement could broaden the applications for PVDF nanocomposites. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 Copyright © 2012 Wiley Periodicals, Inc.


El Achaby M.,Institute of Nanomaterials and Nanotechnologies NANOTECH | El Achaby M.,Mohammed V University | Arrakhiz F.Z.,Institute of Nanomaterials and Nanotechnologies NANOTECH | Arrakhiz F.Z.,Mohammed V University | And 5 more authors.
Applied Surface Science | Year: 2012

Graphene oxide nanosheets (GOn)/PVDF nanocomposite films were prepared by solution casting method with various GOn contents. GOn were obtained via sonication of bulk graphite oxide in dimethylformamide (DMF). Due to the strong and specific interaction between carbonyl group (CO) in GOn surface and fluorine group (CF 2) in PVDF, the GOn were homogeneously dispersed and distributed within the matrix. The chosen approach for preparation and the high compatibility between GOn and PVDF result in the formation of purely piezoelectric β-polymorph at only 0.1 wt.% GOn content. Below that content a mixture of β and α-polymorph is observed. The Young's modulus and tensile strength of PVDF were respectively increased by 192% and 92% with the addition of 2 wt.% GOn. The thermal stability of PVDF polymer was also significantly increased with increasing of GOn loading. The as-obtained flexible nanocomposite films with such low GOn content can be used as active materials in the field of piezoelectric applications. © 2012 Elsevier B.V. All rights reserved.


El Achaby M.,Institute of Nanomaterials and Nanotechnologies NANOTECH | El Achaby M.,Mohammed V University | Essassi E.M.,Institute of Nanomaterials and Nanotechnologies NANOTECH | Essassi E.M.,Mohammed V University | El Kacem Qaiss A.,Institute of Nanomaterials and Nanotechnologies NANOTECH
Key Engineering Materials | Year: 2013

The aim of this work is to prepare, by extrusion, blends of polypropylene (PP)/styrene-ethylene-butadiene-styrene-g-maleic anhydride (SEBS-g-MA) at the ratios of 100/0, 95/5, 90/10, 85/15 80/20. Then, a amount of 10 wt% of calcium carbonate (CaCO3) was added to each polymer blend to prepare (PP/SEBS-g-MA)/CaCO3 composites with effective ratios of (100/0)/10 (95/5)/10, (90/10)/10, (85/15)/15 and (80/20)/10. Morphological and tensile properties of PP/SEBS-g-MA, PP/CaCO3 and (PP/SEBS-g-MA)/CaCO 3 were evaluated and compared. It was found that the presence of SEBS-g-MA improves the particle dispersion and interfacial adhesion. The tensile properties of PP polymer were affected by addition of SEBS-g-MA and/or CaCO3. Indeed, the addition of only SEBS-g-MA the young's modulus and tensile strength of PP were remarkably decreased and the elongation at break was significantly increased. In contrast, the PP/CaCO3 composites shows improved young's modulus and tensile strength and reduced elongation at break in regard to neat PP. A balance between these selected properties was found in (PP/SEBS-g-MA)/CaCO3 composites, while the young's, tensile strength and elongation at break were together increased. © (2013) Trans Tech Publications.


El Achaby M.,Institute of Nanomaterials and Nanotechnologies NANOTECH | El Achaby M.,Mohammed V University | Essassi E.M.,Institute of Nanomaterials and Nanotechnologies NANOTECH | Essassi E.M.,Mohammed V University | El KacemQaiss A.,Institute of Nanomaterials and Nanotechnologies NANOTECH
Key Engineering Materials | Year: 2013

PolyVinyliDene Fluoride (PVDF)/Calcium carbonate (CaCO3) composites were processed with incorporation of different weight fractions (1, 2 and 10 wt %) of CaCO3 particles into PVDF matrix using melt blending method. The influence of CaCO3 on the structural, thermal and mechanical properties of PVDF polymer was evaluated by using a variety of technique of characterization such as scanning electron microscopy (SEM), X-Ray diffraction (XRD), differential scanning calometry (DSC), thermogravitometric analysis (TGA) and uni-axial tensile test. It was found that the addition of CaCO3 particles results in an increase of thermal stability and some selected tensile properties of PVDF polymer. © (2013) Trans Tech Publications.


El Achaby M.,Institute of Nanomaterials and Nanotechnologies NANOTECH | El Achaby M.,Mohammed V University | Qaiss A.,Institute of Nanomaterials and Nanotechnologies NANOTECH
Materials and Design | Year: 2013

High density polyethylene (HDPE)/graphene nanosheets (GNs) and HDPE/Multi-Walled Carbon Nanotubes (MWCNTs) nanocomposites with 0.5%, 1% and 3% nanofiller contents were prepared using the melt mixing method. The dispersion of the nanofillers in the polymer was monitored by scanning electron microscopy and melt rheology studies. Morphological, rheological, thermal and tensile properties of nanocomposites were comparatively studied. The results were discussed in terms of the geometries of GNs and MWCNTs. It was found that the HDPE/GNs nanocomposites show better properties than HDPE/MWCNTs nanocomposites at identical filler content. The superiority of HDPE/GNs nanocomposites may be due to high specificsurface area and nanoscale 2-D flat surface of GNs which result in an enhanced mechanicalinterlocking with the polymer chains and enlarged interphase zone at filler-polymer interface. This effect is less pronounced in MWCNTs based nanocomposites because the MWCNTs have a reduced surface area and can interact with the polymer only at 1-D linear contact. © 2012 Elsevier Ltd.

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