Variance in Breaking-Strength Distribution of Yarns Raveled from Chemically Treated Cotton Fabrics

Abstract

Cotton fabrics were treated with DMDHEU in a conventional pad-dry-cure process, or a mixture of N-methylol acrylamide (NMA), acrylamide (AM), and tetraki(hydroxy methyl)phosphonium chloride (THPC) in a system where in situ polymerization is en couraged. Yarns drawn from treated fabrics were tensile-tested at two rates of loading. The dependence of coefficient of variation (CV) in breaking-strength distribution on chemical cross-linking, polymer deposition, and rate of loading is discussed. It is con cluded that coefficient of variation in breaking-strength distribution can be a useful parameter in interpreting structural changes resulting from chemical treatment of fabrics. The information obtained is not apparent if only average breaking strength is considered.

Keywords

Cotton fabrics acrylamide methylol acrylamide THPC DMDHEU vinyl mono mers methylol ureas. Chemically modified cotton chemically modified cellulosic fibers. Textile processes (general). Catalyst H-7 (TM)zinc nitrate catalyst. Temperature concentration time. Cross-linking addition polymerization condensation polymeriza tion polymer deposition cyclic loading elongation strain rate coefficient of variation variance yarn strength wrinkle recovery strength extensibility regain. Testing. Pad-dry-cure process.

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