Browsing by Author "Allam, E. E."

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Dyeing of nylon 6 fabric with a bifunctional sulphatoethylsulphone reactive disperse dye
(BLACKWELL PUBLISHING, 2007) Youssef, Y. A.; Mousa, A. A.; Farouk, R.; Allam, E. E.; El-Kharadly, E. A.
A bifunctional reactive disperse dye containing two temporarily anionic sulphatoethylsulphone groups was synthesised and applied to nylon 6 fabric by exhaust dyeing at a variety of pH levels and temperatures. A monofunctional reactive disperse dye containing one temporarily anionic sulphatoethylsulphone group was also synthesised, and its dyeing behaviour was compared with the bifunctional dye. The bifunctional reactive disperse dye exhibited high exhaustion and total fixation yield under alkaline conditions. The results also indicate that the introduction of two temporarily anionic sulphatoethylsulphone groups of the bifunctional dye gave an enhancement in dyeing performance compared with that of the monofunctional dye. The dyes also showed very good levelling and fastness properties on nylon 6 fabric.
Technological evaluation of reactive cyclodextrin in cotton printing with reactive and natural dyes
(JOHN WILEY & SONS INC, 2006) Hebeish, A. A.; Ragheb, A. A.; Nassar, S. H.; Allam, E. E.; Abd El Thalouth, J. I.
The chemical modification of cotton fabric with reactive cyclodextrin (R-CD) at different concentrations was carried out to enhance the printability of cotton fabric. The extent of the modification reaction was expressed as %N. Reactive and natural dyes were used to print cotton fabric before and after modification. Printing pastes were applied immediately after preparation or after 24 h of storage. Printing fixation was performed through either steaming or thermal treatment. The effect of the incorporation of R-CD in the printing paste of unmodified cotton was also studied. The results reveal that the extent of the modification reaction increased with increasing R-CD concentration and so did the color strength (K/S) of the printed sample regardless of the dye used. The results also revealed that K/S of the R-CD modified cottons were higher than that of the corresponding unmodified samples regardless of the method of fixation or the time elapsed before printing. On the other hand, the incorporation of R-CD in the printing pastes of reactive dyes, namely, Cibacron Brown 6R-P or Remazol Brilliant Red GG, had adverse effects, most probability due to the (a) increasing viscosity of the paste and/or (b) interaction of the reactive dye with R-CD hydroxyls. The opposite held true when a natural dye was used. Further, the incorporation of R-CD in the printing pastes had no effect on the rheological type of the pastes or the on overall fastness properties of the prints. Nevertheless, such an incorporation of R-CD was accompanied by a remarkable increase in the magnitude of the apparent viscosity. (c) 2006 Wiley Periodicals, Inc.