Higher Institute of Technological Studies of Ksar Hellal

of Ksar Hellal, Tunisia

Higher Institute of Technological Studies of Ksar Hellal

of Ksar Hellal, Tunisia
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Khiari R.,Higher Institute of Technological Studies of Ksar Hellal | Khiari R.,University of Monastir | Khiari R.,Grenoble Institute of Technology
International Journal of Polymer Science | Year: 2017

This paper reports the isolation of cellulose nanofbrils (CNFs) from almond stems, available as agricultural residues. Te CNF suspensions were prepared by the combination of chemical and mechanical treatment: the microscopic fbres were frstly isolated by the delignifcation-bleaching process, followed by TEMPO-mediated oxidation to facilitate the further nanofbrillation using highpressure homogenization process at 600 bar for 10 passes as a mechanical treatment. Te ensuing CNFs were characterized by several methods, such as transmission electron microscopy (TEM), degree of fbrillation, and carboxyl content. Di?erent nanocomposites were prepared by casting-evaporation method from the mixture of CNF suspension in the commercial acrylic latex as a matrix. Te e?ect of CNF loading on mechanical and thermal properties of the composites was then studied. Te considerable enhancement of both Young's modulus and tensile strength was observed, which clearly indicates that the nanocomposites reinforced with the nanofbrils from Prunus amygdalus have promising mechanical properties. © 2017 Ramzi Khiari.


Naili H.,Tunis el Manar University | Jelidi A.,Tunis el Manar University | Limam O.,Tunis el Manar University | Khiari R.,University of Monastir | And 2 more authors.
Industrial Crops and Products | Year: 2017

In the context of the development of green building materials using plant fibers, this research has focused on the characterization of natural fibers extracted from Juncus plant, commonly called Juncus. A well-known chemical extraction method was applied here for the first time at our knowledge to the Juncus plant, in order to obtain better mechanical characteristics (tensile strength and elastic modulus) and better surface morphology. Therefore, a chemical treatment with alkalization through various factors such as temperature, NaOH concentration (alkalizing agent), presence or not of sodium dithionite Na2S2O4 (for reducing lignin) and sodium hypochlorite NaOCl (chlorine bleach delignification agent) was performed. This study aims to determine the effects of different chemical treatments applied to the fiber extraction of Juncus stem, on the change in fiber diameter, surface state morphology, density, tensile strength and elastic modulus. As one of the Juncus fiber treatments considered in this work, the cold alkali-treatment did not give good results in terms of delignification of the Juncus fibers (There is always non-cellulosic products on the treated fiber) and low values of tensile stress and modulus of elasticity. The treatment with a solution of 8% NaOH, sodium hypochlorite and sodium dithionite at hot temperature present the best result due to the effective delignification of the fibers which has allowed reaching highest tensile strength and highest elastic modulus. © 2017 Elsevier B.V.


Guesmi A.,Higher Institute of Technological Studies of Ksar Hellal | Ladhari N.,Higher Institute of Technological Studies of Ksar Hellal | Hamadi N.B.,Laboratory of Synthesis Heterocyclic and Natural Substances | Sakli F.,Higher Institute of Technological Studies of Ksar Hellal
Industrial Crops and Products | Year: 2012

Mature red fruits of Opuntia ficus-indica contain two soluble pigment, betanin and indicaxanthin. The optimal conditions for dye extraction were to mix 50g of juice from cactus pears with 100mL of acidified water as solvent for dye extraction. Two main dyes were purified from the pigment extract by chromatography and identified by UV-vis, HPLC and LC-MS techniques as indicaxanthin (15mg per 100g) and betanin (280mg per 100g). The effect of dye bath pH, salt concentration, dyeing time and temperature was studied. The optimal conditions for dyeing modified acrylic fabrics with betanin dye were carried out at 50°C for 45min at pH 5. Un-mordanted samples have good properties of water and washing fastness. Mordant CoSO 4 was found to give good light fastness (rating 5). © 2011 Elsevier B.V.


Guesmi A.,Higher Institute of Technological Studies of Ksar Hellal | Hamadi N.B.,Laboratory of Synthesis Heterocyclic and Natural Substances | Ladhari N.,Higher Institute of Technological Studies of Ksar Hellal | Sakli F.,Higher Institute of Technological Studies of Ksar Hellal
Industrial Crops and Products | Year: 2012

This research work involves the dyeing of wool with indicaxanthin, a natural dye extracted from fruits of Opuntia ficus-indica. The optimal conditions for dye extraction were to mix 50g of Juice from cactus pears with 100mL of 80% aqueous ethanol as solvent for dye extraction. Liquid chromatography was applied for the separation. Two main dyes were obtained, which were identified as indicaxanthin (75mg per 50g) and betanin (5mg per 50g). The effect of dye bath pH, salt concentration, dyeing time and temperature were studied. The optimal conditions for wool dyeing with indicaxanthin dye were carried out at 70°C for 90min with the pre-treatment of various metal salts as mordant. The colour yields of the dye on the wool were found to be highly dependent of the pH, optimum results being obtained at pH 4. The K/S of wool increased in the order of the dyeing using KAl (SO 4) 2>MnSO 4>CoSO 4>FeSO 4>none>ZnSO 4>CuSO 4. Un-mordanted samples have good properties of water and washing fastness. Mordants KAl (SO 4) 2 and CoSO 4 were found to give good light fastness (rating 5). © 2011 Elsevier B.V.


Guesmi A.,Higher Institute of Technological Studies of Ksar Hellal | Ben hamadi N.,Laboratory of Synthesis Heterocyclic and Natural Substances | Ladhari N.,Higher Institute of Technological Studies of Ksar Hellal | Sakli F.,Higher Institute of Technological Studies of Ksar Hellal
Industrial Crops and Products | Year: 2013

The dyeing of modified acrylic fabrics using indicaxanthin as a natural dye isolated from fruits of Opuntia ficus-indica has been studied in both conventional and ultrasonic techniques. Factors affecting the dyeing properties such as pH values, salt concentration, temperature, duration of dyeing bath, and ultrasonic power were studied. The optimal conditions for dyeing with indicaxanthin dye were carried out at 80 °C for 30. min at pH 3. Sonicator dyeing showed marked improvement in dye uptake. The results of fastness properties of the dyed fabrics were fair to good. Dyeing kinetics using conventional and ultrasonic conditions was compared. Color strength values obtained were found to be higher with ultrasonic than with conventional heating. Dyeing kinetics of modified acrylic fiber with indicaxanthin dye using conventional and ultrasonic conditions were compared. The values of dyeing rate constant, half-time of dyeing and standard affinity and ultrasonic efficiency have been calculated and discussed. © 2012 Elsevier B.V.


Moussa A.,University of Monastir | Marzoug I.B.,University of Monastir | Marzoug I.B.,Higher Institute of Technological Studies of Ksar Hellal | Bouchereb H.,University of Monastir | And 2 more authors.
Journal of Industrial Textiles | Year: 2015

This work reports waterproof breathable coated double-sided knitting consisting of cotton and polyester fibres. Two kinds of fabrics (F1 and F2) were tested in this study. They were treated with water-repellent chemicals finishing carried out on the polyester side. The main goal of this paper is to study the application and behaviour of double-sided knitting and the finishing with new chemical product to improve comfort. Optimisation of waterproof breathable property of samples was investigated using factorial experimental design. The combined effects of parameters which can affect treatment on water repellency, air permeability and porosity were then studied and the optimum conditions were determined. Waterproof breathable double-sided knitting was able to be generated. These fabrics are supposed to be used as the shoes lining. © 2015, © The Author(s) 2015.

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