Effect of degumming on structure and mechanical properties of silk textile made with silk/polyurethane core-spun yarn

Abstract

Although silk textile shows excellent performance when used in clothing over a long period, its limited elongation and elasticity have restricted its extension to other textile and non-textile applications. In the present study, silk textile was produced using silk/ polyurethane core-spun yarn and degummed to enhance its elongation and elasticity. The effects of degumming on the structure and mechanical properties of the silk textile were examined. Scanning electron microscopy observation revealed that the silk filaments became finer and more flexible with degumming, resulting in increased tangling of weft yarns and a highly shrunk textile structure in the weft direction. Although the strength of the degummed silk textile was decreased, its elongation greatly increased by 383% (a 16-fold increase) because of the degumming treatment. In particular, the elasticity of the silk textile was greatly improved. The silk textile exhibited ~30% reduction in the elongation after the second extension; however, the elongation almost did not change after 18 additional extension–recovery tests. its use in other textile and non-textile applications. In a previous study, as a preliminary work, silk textile was made with silk/ polyurethane core-spun yarn and treated with hot water to improve its elongation and elasticity and Um, 2016). However, the results were unpromising, with the silk textile exhibiting 96.7% elasticity, even although it was just extended by an elongation of 20%. In the present study, the silk textile made with silk/ polyurethane core-spun yarn was degummed to enhance its elasticity, and the effects of degumming on the structure and mechanical properties of the silk textile were examined.