Abstract
AbstractMill‐scoured and bleached cotton fabric, alkali‐treated cotton, and cyanoethylated cottons having 0.1%, 0.47%, 0.89%, and 1.25% nitrogen were subjected to thermal treatments. The latter were carried out at different temperatures for different durations of time. Chemical degradation of the substrates brought about by thermal treatments was assessed by copper number, carboxylic groups, nitrogen content, and degree of polymerization whereas deterioration was measured by tensile strength and elongation at break. It was found that: (a) alkali‐treated cotton undergoes higher degradation than cyanoethylated cottons; (b) cyanoethylated cottons are more susceptible to degradation than the original (mill‐scoured and bleached) cotton; (c) the magnitude of deterioration of the substrate is determined by the previous chemical treatments; and (d) with cyanoethylated cotton, the higher the cyanoethyl content (expressed as % nitrogen) the greater the DP and tensile strength.
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