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Electrokinetic properties of processed cellulose fibersStana-Kleinschek, Karin ; Ribitsch, VolkerNatural cellulose fibers (cotton) comprise several noncellulose compounds (hemicellulose, wax and pectin substances) and cationic impurities which cause problems during different absorption processes ... such as dyeing or final fiber finishing and coating.Therefore the chemical purification (NaOH boiling, enzymatic purification, demineralization, extraction or oxidative bleaching) is the most important step in cellulose textile finishing. Alternaive ways to describe the success of different processes in fiber purification which result in distinct surface charge and hydrophilicity are the determination of electrokinetic properties and water uptake of textile fibers. The zeta potential was determined by the streaming potential measurement as a function of pH. From the zeta potential-pH functions the adsorption potential for all ionic species ▫$\phi_i$▫ (i.e. ▫$\phi_K+$▫, ▫$\phi_H+$▫, ▫$\phi_Cl-$▫, ▫$\phi_OH-$▫, in case of potassium chloride solutions), the charge densities ▫$\sigma^k$▫ and the pK values are calculated according to the Börner and Jakobasch model. The degradation and removal of hydrophobic noncellulose compounds which cover the primary hydroxyl and carboxyl groups of the cellulose polymer is clearly shown by an increase of the negative zeta-potential of the plateau, which is in good agreement with the elektrokinetic parameters of cotton samples determined by the Börner and Jakobasch model. The electrokinetic parameters determined by the Börner and Jakobasch model can be used to describe the adsorption/dissociation ability of textile fibers. The progress of the fiber processing (cleaning) is reflected by the surface charge as well as the hydrophylicity of the fiber.Source: Colloids and surfaces. A, Physicochemical and Engineering Aspects. - ISSN 0927-7757 (140, 1998, str. 127-138)Type of material - article, component partPublish date - 1998Language - englishCOBISS.SI-ID - 3854358
Author
Stana-Kleinschek, Karin |
Ribitsch, Volker
Topics
tekstilna industrija |
apretiranje |
celulozna vlakna |
adsorpcija |
zeta potencial |
elektrokinetične lastnosti |
gostota naboja |
strujni potencial |
kemijska degradacija |
textile industry |
chemical finishing |
cellulose fibers |
adsorption |
zeta potential |
electrokinetic properties |
streaming potential |
charge denity |
chemical purification
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Stana-Kleinschek, Karin | 07814 |
Ribitsch, Volker | 15077 |
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