Browsing by Author "Abd El-Thalouth, I."

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Evaluation of enzymatic hydrolyzed starches in discharge, discharge-resist and burn-out printing styles
(NATL INST SCIENCE COMMUNICATION-NISCAIR, 2013) Abd El-Thalouth, I.; Ragheb, A.A; Nassar, S.H; Ibrahim, M.A; Shahin, A.A
Maize starch samples have been subjected to gelatinization at 70 degrees C followed by enzymatic treatment using different concentrations of a-amylase enzyme (0.025, 0.050, 0.075 and 0.1 mL/50g starch) and then used in printing paste as thickener for discharge, discharge-resist and burn-out printing on cotton, wool/polyester and viscose/polyester/lucre fabrics. The results show that enzymatic treatment of maize starch converts the rheological properties of starch from thixotropic into pseudo-plastic. Increase in a-amylase enzyme concentration is accompanied, by a decrease in the apparent viscosity. While enzyme-treated starches give better results when used as thickening agent in discharge-resist printing compared with sodium alginate, the opposite holds true in case of discharge printing. Enzyme-treated starches specially that prepared using 0.1 mL/50g starch could act successfully as thickening agent in burn-out printing of both wool/polyester and viscose/polyester/lucre blends.
Minimization of dyestuff pollutions using native, alkali-treated or bleached cellulose of rice straw as adsorbent
(NATL INST SCIENCE COMMUNICATION-NISCAIR, 2013) Abd El-Thalouth, I.; El-Hennawi, H. M.; Abd El-Salam, S. S.; Adel, E.
Cellulose rice straw pulp has been prepared via alkali scouring and wscouring+ bleaching and then used along with the raw material as dye adsorbents for some selected reactive dyes. Factors affecting dyestuff adsorption such as technique applied (mechanical shaking and ultrasonic), time, temperature, amount of substrate and concentration of the dyestuff have been thoroughly investigated. It is found that % colour removal depends on (i) nature of reactive dye used, (ii) degree of purity of adsorbent i.e. either native, alkali-treated or bleached cellulose, and (iii) technique applied during dye adsorption.
Preparation, characterization and technological evaluation of CMC derived from rice-straw as thickening agents in discharge, discharge-resist and burn-out printing
(ELSEVIER SCI LTD, 2012) Ragheb, A. A.; Nassar, S. H.; Abd El-Thalouth, I.; Ibrahim, M. A.; Shahin, A. A.
Carboxymethyl cellulose samples of different D.S. values were prepared from rice straw via pulping followed by etherification with monochloroacetic acid under the catalytic action of sodium hydroxide. The prepared derivatives were assessed for D.S., rheological properties as well as suitability as thickening agents in different printing styles. It was found that carboxymethyl cellulose derived from rice straw is characterized by a non-Newtonian pseudoplastic behavior and its apparent viscosity at any specific rate of shear depends on the D.S. All the prepared derivatives could be used successfully as thickening agents in discharge and/or discharge/resist printing of cotton fabrics. Furthermore, they could be used also as thickening agent for burn-out printing style of wool/polyester blended fabrics using sodium hydroxide. Attractive samples could be obtained via using these techniques. (C) 2012 Elsevier Ltd. All rights reserved.