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Hakeim O.A.,Textile Research Division | Abdou L.A.W.,Textile Research Division | El-Gammal M.S.,Textile Research Division | El-Naggar A.M.,National Center for Radiation Research And Technology
Carbohydrate Polymers | Year: 2012

Accelerated electrons delivered by electron beam accelerator were used to fix vat colors, incorporated in curable formulations containing diluting monomer and an oligomer, to cellulosic fabric, cotton and polyester fabric. Tetrahydrofurfuryl acrylate, hexane dioldiacrylate, monomers and trifunctional urethane methacrylate, oligomer were used as curable base beside ethylene glycol. The fabrics were printed with these formulations and exposed to various doses of electron beam irradiation generated from the 1.5 MeV (25 kW) electron beam accelerator machine. Critical factors included the irradiation dose, formulation composition, and vat color concentration were studied. The fabrics printed with the vat colors by electron beam irradiation displayed higher color yield than those fabrics printed by the conventional curing at equal vat color ratios. The durable properties of fabrics printed by electron beam irradiation except the roughness properties are extremely better than those printed by conventional fixation method. © 2011 Elsevier Ltd. All rights reserved.


Abdou L.A.W.,Textile Research Division | Hakeim O.A.,Textile Research Division | Mahmoud M.S.,Textile Research Division | El-Naggar A.M.,National Center for Radiation Research And Technology
Chemical Engineering Journal | Year: 2011

Dyes released from industrial textile processing constitute major problems into the environment. In the present work, ionizing radiation such as electron beam irradiation was utilized in the decoloration and degradation of the remained dye waste after dyeing cotton fabrics with four different dyestuffs based on azo and anthraquinone structures. The treatment of the remained dye waste was also carried out by gamma irradiation for comparison. The influences of irradiation dose, H 2O 2 concentration, pH of the solution, and dye concentration on the percentage decoloration was studied. In addition, the chemical oxygen demand (COD) and total organic carbon contents (TOC) were described. The results showed that the higher decoloration and degradation of dyes was obtained in case of using electron beam than gamma irradiation at the same conditions. The TOC and COD reduction for all dye solution were approximately 72-91% and 71-93% respectively. © 2011 Elsevier B.V.


Hamouda T.,Textile Research Division | Kilic A.,TEMAG Labs
Polymer Composites | Year: 2015

Sandwich composites based on coir fiber nonwoven mats as core material were manufactured by Vacuum Assisted Resin Transfer Molding technique. Mechanical and physical properties of produced coir/polyester and coir-glass/polyester composites were assessed. Samples were evaluated according to their reinforcement contents, resin contents, areal density, and thickness. Tests on physical properties revealed that coir-glass/polyester sandwich structure has the lowest values of thickness swelling, water absorption and moisture contents compared with coir/polyester composite. Mechanical tests such as tensile strength, open-hole tensile strength, and flexural strength were also performed on all samples. Coir-glass/polyester sandwich structure showed significant increase in tensile strength of 70 MPa compared with 8 MPa of coir/polyester composite. Introducing two skins of fiber glass woven roving to coir/polyester increased its flexural strength from 31.8 to 131.8 MPa for coir-glass/polyester. © 2015 Society of Plastics Engineers.


Gaffer H.,Textile Research Division | Salem M.,Ain Shams University | Marzouk M.,Ain Shams University
Pigment and Resin Technology | Year: 2016

Purpose - The present study aims to focus on the possibility of developing new eco-friendly azo dyes with good colouristic application properties, exhibiting biological and pharmacological activities. Design/methodology/approach - Coupling of 4-hydroxycoumarin with a variety of aromatic diazonium salts of 2-Aminothiazole, 2-Aminobenzothiazole, 4-Aminoantipyrine, 4-Aminoacetophenone, adenine sulphate, a-naphthylamine and sulphadimidine to produce novel azo dyes. The compounds were fully characterised using spectroscopic and analytical methods. All of the compounds were tested for their antimicrobial, anticancer and antioxidant activities. The prepared dyestuffs were dyed on polyester fabrics and subsequently their dyeing properties, light, washing, perspiration, rubbing and sublimation fastness were determined. Findings - The spectroscopic data of the synthesised compounds have provided decisive evidence that such compounds exist in the solid state as the azo-dike to form C and in solution in equilibrium tautomer forms A, B and D. The prepared dyestuffs are suitable for either heat transfer printing or traditional printing on polyester and nylon 6 fabrics. The prints obtained from the dyes possess high colour strength, as well as good overall fastness properties. Also the synthesised compounds exhibit good biological and pharmacology activity. Research limitations/implications - Synthesis of these seven azo dyes for textile dyeing had never been reported previously. Practical implications - The dyestuffs derived from 4-hydroxycoumarin are reasonable azo disperse dyestuffs giving good all round fastness properties on polyester fabrics. Social implications - Production of less expensive and new eco-friendly dyes exhibit antimicrobial and anticancer activity. Originality/value - It provided a potentially simple way to synthesize novel coumarin azo-dyes exhibit good biological and pharmacology activity and also exhibit good overall fastness properties.


Hebeish A.,Textile Research Division | Ragheb A.A.,Textile Research Division | Nassar S.H.,Textile Research Division | Allam E.E.,Helwan University | El-Thalouth J.I.A.,Helwan University
Egyptian Journal of Chemistry | Year: 2011

TARA SEEDS were subjected to mechanical crushing sieving and soaking in water followed by filtration to obtain galactomannan gum. Rheological properties of this gum were investigated before and after the gum was treated with sodium hydroxide (0. 5 to 10%). Experience gained from this study was used to concurrently isolate eco-friendly galactomannan gum and safety natural dye from Tara seeds in one step process. Evaluation was made of the obtained self printing paste for printing cotton, wool and silk fabrics in presence and absence of different mordants. It was found that pastes of Tara gum treated with sodium hydroxide at a range of 0.5 to 2 % exhibit non-Newtonian pseudo plastic behavior, whereas the latter is converted at higher alkali concentrations to non- Newtonian Thixotropic behavior; similar to pastes prepared from the untreated gum. The colored printing paste, which was isolated from Tara seeds, could successfully be used in printing of silk, wool and cotton fabrics without any additives, but the shade was only confined to one color. It was also found that the K/S values of silk and wool are practically equal meanwhile they are higher than that of cotton. Mordants enhance printing and create different colors, depending upon their nature. For example the K/S of printed cotton samples displays the highest value with tannic acid and the lowest with alum and follows the order: tannic acid > copper sulphate > ferrous sulphate > potassium dichromate > alum ; an order which is also valid for wool and silk fabrics. Fabrics printed by the self printing paste acquire color fastness to rubbing, to washing, and to perspiration ranging from very good to excellent, besides, resistance of the prints to alkali treatment.


Aly A.S.,Textile Research Division | El-Sayed D.R.,Helwan University | Zahran M.K.,Helwan University
Egyptian Journal of Chemistry | Year: 2012

SILVER loaded chitosan /methoxy polyethylene glycol chloro triazine (Ag/chit-MPEGT) core/shell nano particles were synthesized as a durable finish for cotton fabrics. Ag/chit-MPEGT was firstly synthesized by reaction of silver loaded chitosan (Ag-chit) with methoxy polyethylene glycol dichlorotriazine. The latter was prepared by reaction of MPEG with 2,4,6-trichloro-s-triazine in acetone and sodium carbonate. Silver loaded chitosan(Ag/chit) nanoparticles were prepared by Ionotropic gelatin method. The resulting Ag/chit-MPEGT core/shell nano-particles were characterized by IR-spectra, 1H NMR spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and elemental spectroscopy imaging (ESI). The cotton fabric is treated with the prepared core/shell nanoparticles using the conventional and convenient pad-dry-cure techniques to impart the durable antimicrobial properties. Citric acid was used as a crosslinking agent to improve the morphology, the crease resistance and the durable press finishing of the treated fabric. The latter was tested for the fabric surface morphology, crease resistance, break tensile strength, elongation-at-break, air permeability and antimicrobial activity.


Abdel-Fattah S.H.,Textile Research Division | El-Khatib E.M.,Textile Research Division | Kantouch A.M.,Textile Research Division | El-Zawawi I.K.,National Research Center of Egypt
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2010

Wool is a suitable medium for growing bacteria and fungi under favorable temperature and humidity conditions resulting in wool degradation and skin irritation or infections. Several investigations have been applied to impart antimicrobial finish of wool fabrics based on organic chemicals, but they are not environmental friendly. The present investigation aims to study the influence of treatment with metallic ions as well as silver nanoparticles, by nanolayer condensation, on wool fabrics, for improvement of its properties. Wool treated with the aforementioned methods show antimicrobial activity, UV-protection properties and improvement in conductivity and crease recovery. The changes in surface morphologies were observed. © Sila Science.


El-Sayed A.A.,Textile Research Division | Salama M.,Textile Research Division | Dorgham S.M.,National Research Center of Egypt | Kantouch A.,Textile Research Division
Indian Journal of Fibre and Textile Research | Year: 2015

Viscose fabrics have been modified to enhance the attraction for nano metal oxides, namely aluminum oxide, zinc oxide or titanium (IV) oxide, to impart antimicrobial activity against Escherichia coli and Candida albicans. Viscose fabrics are pretreated with 3-bromoprpionic acid prior to loading with nano metal oxides. Optimization of the acid concentration is reported. The overall results show a unique ability to stop microorganisms growth on the viscose fabrics pretreated with 3-bromopropionic acid and after treatment with nano metal oxides. The ability of nano metal oxide treated viscose fabrics to reduce the microbial growth is found in the following order: zinc oxide > aluminum oxide > titanium (IV) oxide. The durability of antimicrobial activity has been tested after thirty wash cycles. © 2015 National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.


El-Naggar M.E.,Textile Research Division | El-Naggar M.E.,North Carolina State University | Abdelgawad A.M.,Textile Research Division | Abdelgawad A.M.,North Carolina State University | And 3 more authors.
Carbohydrate Polymers | Year: 2016

Curdlan (CURD) and polyethylene oxide were used to synthesize nanofibers as carriers of hydro soluble tetracycline hydrochloride (TCH). The viscosity, surface tension and conductivity of the precursor multicomponent aqueous solutions were determined and adjusted to produce defect-free fiber webs. Except for a slight increase in diameter, the addition of TCH did not affect the original morphology of the CURD/PEO nanofibers, as determined by FE-SEM imaging. However, the thermal stability of the system was enhanced (TGA and DSC). Moreover, water resistance, as measured with 24-h immersion tests, was observed upon crosslinking with glutaraldehyde. In-vitro activity measurements indicated a sustained and controlled TCH time-release pattern and excellent antibacterial activity against E. coli, as assessed by UV–vis spectroscopy and viable cell counting, respectively. Overall, we propose nanofibers based on CURD as promising platforms for scaffolds for wound dressing and drug delivery. © 2016 Elsevier Ltd

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