The changes resulting in the supramolecular structure of cotton fibres after mercerization at different temperatures were investigated by means of X-ray diffraction, sorption measurements and determination of the degree of polymerization. For comparison, corresponding measurements were also carried out after liquid ammonia treatment. Pyrolysis of the mercerized cotton samples showed that the levoglucosan yield of NaOH-treated samples is less than that of untreated or NH3-treated samples. Comparisons were made of the thermal stability of the modified cotton samples, as indicated by DTA and TG.A decrease in the percentage crystallinity was found to lower the onset and peak temperatures of the major decomposition reactions. An NH3-treated sample (acetone) was less thermally stable than untreated or mercerized samples.
Authors:M. M. Abou-Sekkina, A. A. Saafan, M. A. Sakran, and M. A. Ewaida
Several samples of Egyptian cotton fabric strips were subjected to various caustic mercerization conditions, varying in temperature and time. On these samples extensive measurements were undertaken, comprising X-ray diffraction, IR absorption spectra and the temperature-dependence of DC-electric conductivity.