Browsing by Author "Haddadou, Imane"

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Characterization of cellulose prepared from some Algerian lignocellulosic materials (zeen oak wood, Aleppo pine wood and date palm rachis)
(Springer, 2015) Haddadou, Imane; Aliouche, Djamel; Brosse, Nicolas; Amirou, Siham
Effects of corona discharge treatment on the mechanical properties of biocomposites from polylactic acid and Algerian date palm fibres
(2013) Amirou, Siham; Zerizer, A.; Haddadou, Imane; Merlin, A.
In this paper, biocomposites materials based on date palm fibres (untreated or treated with corona discharge) as reinforcing elements and polylactic acid matrices were prepared and characterized. The objective of this study was to evaluate the mechanical properties of these biocomposites by modification of date palm fiber by using corona discharge treatment which results in a surface oxidation. The morphology of processed biocomposites was studied by scanning electron microscopy. It was found that treated fibers of the reinforced composite showed superior mechanical properties as compared with untreated fiber reinforced composites due to the enhanced adhesion between the treated date palm fiber and the polylactic acid matrix. Changes in the surface chemistry were investigated with Fourier Transform infrared spectroscopy. Moreover, morphological studies by scanning electron microscopy demonstrated that better adhesion between the treated fiber and the matrix was achieved. Such studies are of great interest in the development of environmentally friendly composites from biodegradable polymers
Etude des propriétés des membranes cellulosiques issues de différentes espèces de bois algériens
(2015) Haddadou, Imane
Dans le cadre de la valorisation de plusieurs espèces de bois algériens, la cellulose est extraite par deux différents procédés : Kraft et organosolv. Après caractérisation des différentes celluloses obtenues, les fibres ont été solubilisées en vue de préparer des membranes biopolymères destinées au traitement des effluents des industries manufacturières (colorants). La dissolution de la cellulose fibreuse est un processus difficile et compliqué, du fait de la faible interaction de ce polysaccharide avec de nombreux solvants connus actuellement. De ce fait le procédé le plus abouti semble l'utilisation de produits tensioactifs qui ont fait l'objet du présent travail. Deux types de liquides ioniques ont été utilisés : le chlorure de 1-butyl-3méthylimidazolium et l'acétate de 1-éthyl-3-méthylimidazolium. Enfin afin de valider l'efficacité des membranes, de déterminer leur capacité à retenir les différents colorants considérés (le bleu de méthylène et le rouge de Congo) et de mieux comprendre leur mécanisme d'adsorption sur la surface des membranes, une modélisation des cinétiques et des isothermes d'adsorption a été réalisée. Ainsi il a été constaté que les membranes élaborées ont parfaitement retenu les deux colorants utilisés
Particleboards production from date palm biomass
(Springer Berlin Heidelberg, 2013) Amirou, Siham; Zerizer, A.; Pizzi, A.; Haddadou, Imane; Zhou, X.
Date palm biomass is a renewable natural resource that has not widely been utilized in industry. The objective of this study was to examine some chemical properties of date palm trunk and rachis (holocellulose, cellulose, lignin and extractives) and to evaluate their suitability to produce composite panels. Particleboards were produced using trunk and rachis as an alternative raw material for forest products industry in the presence of two types of polycondensation resins (phenol–formaldehyde and melamine urea–formaldehyde) which were selected as binding agents. The panels were tested for their physical (water absorption and thickness swelling) and mechanical (modulus of rupture, modulus of elasticity and internal bond strength) properties. The internal bond strength of date palm trunk and date palm rachis based boards met the requirements of the general purpose product standards (EN 312) at 0.70 g/cm3 density. The panels made with phenol–formaldehyde resin showed better performance with respect to the panels made with melamine urea–formaldehyde. In addition, the particleboard made with date palm trunk particles had better quality compared to the particleboard made from date palm rachis particles. Based on preliminary results of this work, raw materials from date palm trunks and rachis can have a promising potential in the manufacture of particleboards and as a substitute for wood in board production
Thermal behaviour of five different date palm residues of algeria by thermogravimetric analysis
(PRO LIGNO, 2013) Amirou, Siham; Haddadou, Imane; Zerizer, A.
Renewable energy has become more important globally especially with the current fuel and economic crisis. Date palm biomasses are highly potential materials for energy resources. The fact that they are renewable and abundantly available are amongst the attractive reasons of employing them as the major source for renewable energy. The purpose of this research was to investigate the thermal behavior of date palm biomass in order to evaluate their usefulness for energy production. In microparticular scale, the thermogravimetric analysis (TGA) is one of the techniques used to determine the thermal properties of five different date palm residues that were studied: (date palm rachis (DPR), date palm trunk (DPT), leaf base (Petiole) (LB), fruitstalk prunings (FP) and liff (LP)). The TGA technique consists to record the lost weight during the increase in temperature from 20°C until 600°C with a 10°C/min heating rate. The thermograms presented a departure phase of free water (from room temperature to 110°C) before the degradation process of the lignocellulosic constituents. The lignin and hemicellulose play an important role on the degradation of lignocellulosic materials at the temperature under 250°C. The degradation of cellulose begins at 250°C and overlaps to that of lignin until 450°C