Amidoximated grafted cellulose was obtained by reacting hydroxylamine and cellulose-graftpolyacrylonitrile (C-g-PAN), prepared by KMnO 4 /citric acid redox system, and the resultant amidoximated grafted cellulose was characterized by scanning electron microscope (SEM), solid-state NMR, FTIR, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and elemental analysis. The highest value of amidoxime content in the grafted sample was 2.42 mmol/g. The adsorption efficiencies of amidoximated grafted cellulose have been evaluated with studying different adsorption conditions. Amidoximated sample with amidoxime content 2.42 mmol/g showed high ability to adsorb the metal ions from the aqueous solutions as high as 1.7 mmol/g, 1.6 mmol/g, and 0.84 mmol/g for Co 2þ , Cu 2þ , Ni 2þ ions, respectively, at the highest original metal ion concentration. These values are about three times larger than previous studies.

No abstract

Several samples of native (untreated), mercerized (prior to ammonia treatment), and ammonia-treated Egyptian cotton fabric strips have been prepared. On these cotton samples several measurements were carried out, comprising Cu Ka X-ray diffraction analysis, Infrared absorption spectra, and the temperature dependence of the dc electrical conductivity. Detailed accounts of the spectral properties and phase constitution of NH3-treated cotton fabric strips were correlated with their electrical properties. Finally, the mechanism of electric conduction in NH3-treated Egyptian fabric strips was put forward and correlated with their spectral properties and phase constitution for the first time for cotton textile industries.

Examinations of the structural changes of mercerized cottons in sodium hydroxide or liquid ammonia were followed by determination of the degree of polymerization, sorption ratio and Xray percentage crystallinity. Comparisons were made of the thermal stability, as indicated by differential thermal analysis and thermogravimetric analysis of the mercerized cottons. A decrease in the percentage crystallinity was found to lower then onset and peak temperatures of the major decomposition reaction. It was also found that the temperature where the major weight loss began increased in the sequence: cellulose III, cellulose II, and cellulose I. Samples in cellulose II1 crystals form were less thermally stable than samples of cellulose I and cellulose II. It will be noted however that the difference between cellulose II and cellulose III was small. Cotton cellulose II gave a lower yield of levoglucosan than either cotton cellulose I or II.

No abstract