Abstract:The role of certain cations as homopolymer inhibitors in the direct radiation grafting of acrylic acid to nylon-6 fabric was investigated. The grafting solution was methanol and water at a ratio of 30 : 70 ~01%. The maximum graft yield was obtained at 0.08 wt% when using Fez+ and at 0.7% for Fe3+. In addition, the graft yield obtained with the latter ion was higher than that for the former. Moreover, the presence of Na+ and K' salts in concentrations as low as 0.1 wt% caused an increase in the graft yield. The… Show more
“…Polethylene‐coated polypropylene nonwoven fabric was placed in contact with the grafting solution containing different concentrations of aqueous solution of acrylamide monomer (5, 7, 10, 15%) (vol %) in a glass tube. Ferric chloride aqueous solution of 0.7 wt % as inhibitor was added to the grafting solution 11. The glass tubes were then exposed to γ‐irradiation at the required doses and at different dose rates, namely 1 kGy/h and 4 kGy/h, in the Co‐60 γ‐source under atmospheric air.…”
The graft copolymerization of acrylamide (AAm) monomer onto polyethylene-coated polypropylene (PE-co-PP) nonwoven fabric was carried out by the mutual irradiation method. The general peculiarities of the grafting have been studied by gravimetric, scanning electron microscope (SEM), mechanical properties, and Fourier transform infrared (FTIR) methods. The influence of absorbed dose, dose rate, as well as the monomer concentration on the degree of grafting has been determined. Metal ions uptake of Cu 2þ , Co 2þ , Ni 2þ by the grafted fabrics was evaluated.
“…Polethylene‐coated polypropylene nonwoven fabric was placed in contact with the grafting solution containing different concentrations of aqueous solution of acrylamide monomer (5, 7, 10, 15%) (vol %) in a glass tube. Ferric chloride aqueous solution of 0.7 wt % as inhibitor was added to the grafting solution 11. The glass tubes were then exposed to γ‐irradiation at the required doses and at different dose rates, namely 1 kGy/h and 4 kGy/h, in the Co‐60 γ‐source under atmospheric air.…”
The graft copolymerization of acrylamide (AAm) monomer onto polyethylene-coated polypropylene (PE-co-PP) nonwoven fabric was carried out by the mutual irradiation method. The general peculiarities of the grafting have been studied by gravimetric, scanning electron microscope (SEM), mechanical properties, and Fourier transform infrared (FTIR) methods. The influence of absorbed dose, dose rate, as well as the monomer concentration on the degree of grafting has been determined. Metal ions uptake of Cu 2þ , Co 2þ , Ni 2þ by the grafted fabrics was evaluated.
“…(8)(9)(10)(11) Despite that analogous substances are utilized, applying different treatment methods may create particular properties on the modified surfaces. For examples, a direct graft copolymerization with a functional monomer on an untreated fabric is probable using an appropriate dose of γ -ray irradiation, (12,13) whereas a subsequent grafting procedure is usually applied on a surface-activated fabric. (14)(15)(16)(17) Particular surface properties such as water absorbency, wettability, water repellency (18) and dye affinity, of the treated fabrics can be purposely improved.…”
High density and well surface-distributed oxygen microwave plasma with an extensible antenna-coupling design was utilized to modify a densely weaved and large-surface-area Nylon-6 fabric within a short treatment time. Plasma pretreatment and subsequent acrylic acid (AAc) or 2-hydroxyethyl methacrylate (HEMA) grafting process were studied and optimized at the stage after dyed and finished procedure. The monomer-grafted dyed Nylon-6 fabrics evolved lasting hydrophilic properties and thereafter created or improved surface properties such as water diffusion, drainage, moisture regain and water absorbency, in different degrees. The pHEMA-grafted sample exhibited minor effect in color perception, which was also much hydrophilic than the pAAc-grafted one. Based upon surface analyses and wetting assessment, the penetration of HEMA monomer into the plasma-treated fabric matrix contributed to the facilitation of wetting properties. This work accordingly ensures such plasma-induced system to incorporate with the pattern of hydrophilic properties on the analogous textiles without interrupting their finishing process.
“…Sorption and permeability of water and water vapor to improve the comfort and wear properties of textiles can be enhanced by increasing the hydrophilic nature of synthetic fabrics 1. Many workers have prepared hydrophilic substrates by introducing vinyl monomers containing hydrophilic groups such as acrylic acid2 or acrylamide 3. Another alternate method in practice to achieve hydrophilicity of natural or synthetic textile is the coating technique.…”
Modified textile fabrics were used to remove Cu þ2 and Cr þ3 ions from aqueous solutions. For this purpose, modified Nylon-6, polyester woven and knitted fabrics were prepared by coating the surface with a thin layer of aqueous solution of carboxymethyl cellulose (CMC) and acrylic acid (AAc) of thickness 25 lm. Radiation crosslinking of the coated layer was carried out by electron beam irradiation with a constant dose of 30 kGy. Morphology of the coated fabrics was examined by scanning electron microscope (SEM) which indicated the compatibility between the coated layer and fabrics. Properties attributed to the hydrophilicity, especially water uptake and weight loss before and after several washing cycles were followed up. The effect of AAc concentration on the hydrophilic properties of the coated fabrics was studied. A considerable enhancement in water uptake has been attained on increasing AAc content in solution in case of nylon-6 followed by polyester woven followed by polyester knitted fabrics. The performances of the modified textile fabrics were evaluated for the recovery of Cu þ2 and Cr þ3 from aqueous solution. The metal ion absorption efficiency of the modified textile fabrics was measured using UV Spectrophotometer analysis and EDX. Parameters affecting the efficiency of these textile fabrics in the removal of metal ions from aqueous solution namely, concentration of AAc and the immersion time were studied. It was found that there was a marked increase in the recovery of metal ions on increasing both immersion time and concentration of AAc. This study evidences that the modified textile fabrics can be used for the purpose of removal of some heavy metals such as Cu and Cr.
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