Effect of solvent treatment on mechanical, structural and dyeing properties of regenerated cellulosic yarns

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The mechanical, structural and dyeing properties of conventional viscose and solvent-spun lyocell yarns have been studied in untreated condition as well as after treatment with trichloroacetic acidmethylene chloride (TCAMC) reagent. It is observed that the lyocell yarn has higher tensile strength and abrasion resistance than the conventional viscose yarn. The tensile strength of viscose and lyocell yarns increases on treatment with 5% (w/v) TCAMC for 2 min. The TCAMC treatment has no effect on the elongation of viscose yarn but the elongation of lyocell yarn shows a drop. There is no change in the abrasion resistance of both the yarns due to the treatment. TCAMC modifies the structure of both the regenerated cellulosic yarns. Decrystallisation and disorientation take place on treatment. The crystallite size of lyocell is smaller than that of viscose. The treatment decreases the crystallite size. The dyeability study shows that the dye uptake of lyocell yarn is higher than that of viscose yarn. The TCAMC treatment improves the dye uptake of viscose yarn. Wash and light fastness of both the yarns are not altered due to treatment.</span>