Lipid soil removal from cotton fabric after mercerization and carboxymethylation finishing |
| |
Authors: | S Kay Obendorf Judit Borsa |
| |
Affiliation: | (1) Department of Plastics and Rubber Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary;(2) Department of Textiles and Apparel, Cornell University, Martha Van Rensselaer Hall, 14853 Ithaca, NY |
| |
Abstract: | Soiling and soil removal from cotton fabrics that had been chemically modified by mercerization and carboxymethylation were
studied using electron microscopy and radiotracer techniques. The distribution of lard soil in specimens before and after
laudering was determined by means of chemical tagging with osmium tetroxide. Both the chemical and physical changes of the
cotton resulted in differences in soiling and soil removal of lipid soil. Mercerization and carboxymethylation of cotton swell
the cotton fiber, decrease the crenulation and the lumen, and smooth the fiber surface. These finishes also increase the pore
volume and thus the chemical accessibility of the fibrillar structure. In addition, carboxymethylation causes changes in the
chemistry of the fiber by increasing the carboxyl group content. These structural changes reduce the amount of soil deposited
in the lumen of the fiber, particularly for the carboxymethylated cotton. They also increase soil removal from the crenulation
and the interfiber spaces in the yarn bundle. Soil removal from fiber surfaces and from within the fiber—both lumen and secondary
wall—was highest for the carboxymethylated cotton, and mercerization also enhanced lipid soil removal. The results of this
experiment indicate that chemical accessibility and hydrophilicity of the fiber structure influence both soil deposition and
soil removal of lipid soils. Soil removal of these modified cottons is enhanced by multiple mechanisms: (i) the decrease in
small crevices and the crenulation or small capillary along the fiber, (ii) the increase in pore volume that enhances chemical
accessibility and thus detergency within the fiber structure, (iii) the increase in hydrophilicity that enhances soil removal
from the surface by the roll-up mechanism, (iv) the increase of mechanical action due to enhanced swelling of the carboxymethylated
cotton, and (v) the reduction of soil redeposition on carboxymethylated surfaces. |
| |
Keywords: | Carboxymethylation chemical finishing cotton detergency laundering lipids mercerization microscopy oily soil textiles |
本文献已被 SpringerLink 等数据库收录! |
|