Institute of Nanomaterials and Nanotechnology NANOTECH

Rabat, Morocco

Institute of Nanomaterials and Nanotechnology NANOTECH

Rabat, Morocco
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PubMed | Polytechnic University of Valencia, Institute of Nanomaterials and Nanotechnology NANOTECH, Euro-Mediterranean University and Cadi Ayyad University
Type: | Journal: Carbohydrate polymers | Year: 2016

Three natural clay-based microstructures, namely layered montmorillonite (MMT), nanotubular halloysite (HNT) and micro-fibrillar sepiolite (SP) were used for the synthesis of hybrid chitosan-clay thin films and porous aerogel microspheres. At a first glance, a decrease in the viscosity of the three gel-forming solutions was noticed as a result of breaking the mutual polymeric chains interaction by the clay microstructure. Upon casting, chitosan-clay films displayed enhanced hydrophilicity in the order CS


Essabir H.,Institute of Nanomaterials and Nanotechnology NANOTECH | Essabir H.,University Ibn Zohr | Bensalah M.O.,Mohammed V University | Bouhfid R.,Institute of Nanomaterials and Nanotechnology NANOTECH | Qaiss A.,Institute of Nanomaterials and Nanotechnology NANOTECH
Journal of Biobased Materials and Bioenergy | Year: 2014

Talc is widely used as a fine powder in several industrial products to improve the mechanical characteristics of the compound enhancing the nucleation of the polymer and the dimensional stability of the end product. However the polymer composite materials with vegetable fillers were an attractive field for many industries and researchers. The Talc and Apricot shells (AS) particles were compounded in high density polyethylene (HDPE) matrix at various contents and extruded as continuous strands. This work evaluates the structural, thermal, mechanical and rheological properties of Talc and Apricot shells (AS) particles reinforced HDPE. Young's modulus results shows a gain of 45% in HDPE/Talc composites and 33% in HDPE/AS composites compared to neat polymer at 30 wt.% fillers loading. The presence of the particles improved also the rheological properties, which was represented by the complex modulus and loss factor. The thermal analysis shows an increase in the initial thermal decomposition temperatures with addition of talc, 436.9 °C at 30 wt.% filler content. However, results show that the use of AS particles reduces the degradation temperature of composites (352 °C at 30 wt.% filler content), which is normal with the addition of a low degradation temperature charge. Copyright © 2014 American Scientific Publishers


PubMed | Mohammed V University, Institute of Nanomaterials and Nanotechnology NANOTECH and Laval University
Type: | Journal: Carbohydrate polymers | Year: 2016

This study aimed at developing a biocomposite using polypropylene (PP) as the matrix and Argan nut shell (ANS) as reinforcement. Also, styrene-(ethylene-butene)-styrene triblock copolymer grafted with maleic anhydride (SEBS-g-MA) was used as a coupling agent. The samples were prepared by using extrusion compounding followed by injection molding to determine the effect of filler and coupling agent content on the morphological, thermal, mechanical, and hygroscopic properties of the biocomposites. SEM micrographs revealed that good ANS dispersion/distribution into PP was achieved with an important reduction of fiber pull-out, micro-spaces, and voids with coupling agent addition. This led to substantial improvement intension, torsion, and water absorption reduction due to improved interfacial adhesion. Although ANS particles did not significantly modify the thermal stability of PP, the use of a coupling agent increased it. The experimental data were compared with several theoretical models such Voigt, Reuss, Hirsch, and Tsai-Pagano to characterize the interfacial adhesion quality and to determine the elastic modulus of a single ANS particle. Finally, all the results show that Argan waste to produce PP biocomposites is an interesting avenue to effectively deal with agricultural wastes and develop valuable industrial and practical applications.


Essabir H.,Institute of Nanomaterials and Nanotechnology NANOTECH | Essabir H.,Laboratory Mechanics | Elkhaoulani A.,Arabishe Deutsch Akademie fur Wissertschaft und Technology | Benmoussa K.,Institute of Nanomaterials and Nanotechnology NANOTECH | And 3 more authors.
Materials and Design | Year: 2013

Doum palm fibers are an environmentally friendly reinforcement in polymer composites. Their mechanical properties and abundance allow its use as an innovative material composite. In this paper doum fibers were alkali treated to clean their surface and enhance polymer fibers interaction. Tensile and rheological properties were investigated to see the effect of fibers content on the composites properties. Also, comparative composites were processed to assure a good wettability between fibers and the polymer with the use of a coupling agent as styrene-(ethylene-butene)-styrene three-block copolymer grafted with maleic anhydride (SEBS-g-MA). Results shows that tensile properties was enhanced when fiber were added to the polymer and has enhanced more with the use of coupling agent. A gain of 70% and 77% in the Young's modulus at 30. wt.% fibers content for the binary and ternary composites, respectively. And a gain of 18% in tensile strength at 10. wt.% fibers content for the ternary composites. Moreover, dynamic mechanical thermal analyses were carried out in order to compare the changes of the properties with frequency, fibers loading, temperature and compatibilizer. © 2013 Elsevier Ltd.


Essabir H.,Institute of Nanomaterials and Nanotechnology NANOTECH | Essabir H.,Laboratory Mechanics | Nekhlaoui S.,Mohammed V University | Malha M.,Mohammed V University | And 4 more authors.
Materials and Design | Year: 2013

In this work, Almond Shells (ASs) particles are used as reinforcement in a thermoplastic matrix as polypropylene (PP). Composites containing Almond Shells (ASs) particles with and without compatibilizer (maleic anhydride grafted polypropylene; SEBS-g-MA) for various particle content (5, 10, 15, 20, 25, 30. wt.%) was investigated by means of studying their mechanical, thermal and rheological properties. The composites were prepared in a twin-screw extruder and assessed by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), tensile testing and Dynamic Mechanical Analysis (DMA). Results show a clear improvement in mechanical and rheological properties from the use of Almond Shells particles in the matrix without and with maleic anhydride compatibilizer, corresponding to a gain in Young's modulus of 56.2% and 35% respectively, at 30. wt.% particle loading. Thermal analysis revealed that incorporation of particle in the composites resulted in increase in the initial thermal decomposition temperatures. © 2013 Elsevier Ltd.


Arrakhiz F.Z.,Institute of Nanomaterials and Nanotechnology NANOTECH | Arrakhiz F.Z.,Mohammed V University | El Achaby M.,Institute of Nanomaterials and Nanotechnology NANOTECH | El Achaby M.,Mohammed V University | And 5 more authors.
Materials and Design | Year: 2012

Pine cone fibers are a cellulosic material readily available and can be used as reinforcement in a thermoplastic-based composite. A solid knowledge of their fibrillar morphology and structure is required to evaluate their usefulness as a substitute to other abundant natural fibers. Pine cone fibers were alkali treated prior usage to remove waxes and non cellulosic surface component. Fiber-matrix adhesion was assured by both a styrene-(ethylene-butene)-styrene triblock copolymer grafted with maleic anhydride (SEBS-g-MA) and a linear block copolymer based on styrene and butadiene compatibilizer. Scanning Electron Microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction, Thermogravimetric analysis (TGA), tensile and torsional tests were employed for Pine cone polypropylene composite and compatibilized composite at different fiber content. Results show a clear improvement in mechanical properties from the use of both alkali treated Pine cone and Pine cone compatibilized with maleic anhydride, a gain of 43% and 49% respectively in the Young's modulus, as a results of improved adhesion between fibers and matrix at the interface. © 2012 Elsevier Ltd.


Arrakhiz F.Z.,Institute of Nanomaterials and Nanotechnology Nanotech | Malha M.,Mohammed V University | Bouhfid R.,Institute of Nanomaterials and Nanotechnology Nanotech | Benmoussa K.,Institute of Nanomaterials and Nanotechnology Nanotech | Qaiss A.,Institute of Nanomaterials and Nanotechnology Nanotech
Composites Part B: Engineering | Year: 2013

Mechanical properties of alfa, coir and bagasse fibers reinforced polypropylene (PP) composites have been investigated. In order to improve the composite's mechanical properties, fibers were alkali treated before compounding to remove natural waxes and other non cellulosic compounds. The mechanical properties of the composites obtained with these three fibers were found to be superior to those of the neat polymer. Addition of various amount of reinforcement fibers yielded noticeable increases in both tensile and flexural modulus as well as the torsion parameter. 56-75% increases in tensile modulus were observed by the use of alfa, coir and bagasse while the flexural modulus increased by 30-47% when compared to neat PP. An increase in torsion modulus is also observed when the fiber content exceeds a threshold level. A power law model was developed using an experimental data to calculate the torsion modulus of fiber-reinforced composites at various fiber loading and frequencies. © 2012 Elsevier Ltd. All rights reserved.


Elkhaoulani A.,Arabishe Deutsch Akademie fur Wissertschaft und Technology | Arrakhiz F.Z.,Institute of Nanomaterials and Nanotechnology NANOTECH | Benmoussa K.,Institute of Nanomaterials and Nanotechnology NANOTECH | Bouhfid R.,Institute of Nanomaterials and Nanotechnology NANOTECH | Qaiss A.,Institute of Nanomaterials and Nanotechnology NANOTECH
Materials and Design | Year: 2013

Moroccan hemp is a cellulosic fiber obtained from the north of Morocco. Their use as reinforcement in thermoplastic matrix composite requires a knowledge of their morphology and structure. In this paper the Moroccan hemp fiber was alkali treated to remove waxes and noncellulosic surface components. Fiber/matrix adhesion was assured by the use of a styrene-(ethylene-butene)-styrene three-block copolymer grafted with maleic anhydride (SEBS-g-MA) as a compatibilizer. Scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), tensile and torsional tests were carried out for hemp fibers polypropylene composite and the compatibilized composite at different fiber content. Thus, the binary composite PP/hemp fibers (Alk) and ternary system with maleic anhydride indicate clearly an improved adhesion of the fiber to the matrix as results of the good interaction at the interface. A gain of 50% on the Young's modulus of PP/hemp 25. wt.% without coupling agent and 74% on the PP/hemp 20. wt.% composite with the coupling agent were found. Tensile strength curve shows a remarkable stabilization when the coupling agent was used. © 2013 Elsevier Ltd.


Arrakhiz F.Z.,Institute of Nanomaterials and Nanotechnology NANOTECH | Benmoussa K.,Institute of Nanomaterials and Nanotechnology NANOTECH | Bouhfid R.,Institute of Nanomaterials and Nanotechnology NANOTECH | Qaiss A.,Institute of Nanomaterials and Nanotechnology NANOTECH
Materials and Design | Year: 2013

This paper deals with the mechanical and thermal properties of clay and pine cone fibers reinforced polypropylene hybrid composite at a total weight percent of 30. To enhance charges wettability within the polymer, a coupling agent was added and a mercerization treatment was carried out to the fibers. Tensile, torsional, hardness tests were conducted for these composites to evaluate the impact of hybrid charges. The tensile properties results indicate that the Young's modulus has increased for whole systems reaching a gain of 80%, while tensile strength remained stable with the use of both charges. For torsional and hardness characterizations of such hybrid composite, an increase in the torsional resistance is noted with clay addition when hardness properties were in decrease at high clay loading. Thermal degradation decreases with the addition of fibers which is normal with the addition of a low degradation temperature charge. © 2013 Elsevier Ltd.


Bouhfid R.,Institute of Nanomaterials and Nanotechnology NANOTECH | Arrakhiz F.Z.,Institute of Nanomaterials and Nanotechnology NANOTECH | Qaiss A.,Institute of Nanomaterials and Nanotechnology NANOTECH
Polymer Composites | Year: 2016

Polyamide 6 (PA6) and acrylonitrile butadiene styrene blend reinforced by graphene nanosheets (GNs) nanocomposites were prepared by batch system followed by hot compression to get samples for different tests. A low amounts of graphene were used (1, 2, 3, 4 wt%), with this selected loading range, the mechanical properties (Young's modulus) have increased linearly with GNs contents. However, it is observed stability in the tensile strength. The electrical and rheological properties are well characterized and have shown that the evolution of the properties runs through a threshold loading charge. The results are related to the blends morphology, and SEM images showed selective preferential localization in the polyamide 6 phase. Moreover, the presence of GNs in the blends has reduced the surface tension between the two polymers. © 2014 Society of Plastics Engineers.

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