A study of rheological and molecular weight properties of recycled polysaccharides used as thickeners in textile printing |
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| Authors: | Rebeka Fijan Michele Basile Sonja Šostar-Turk Ema Žagar Majda Žigon Romano Lapasin |
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| Institution: | 1. Institute for Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia;2. Department of Chemical, Environmental and Raw Materials Engineering, University of Trieste, piazzale Europa 1, 34127 Trieste, Italy;3. National Institute of Chemistry Slovenia, Hajdrihova 19, 1001 Ljubljana, Slovenia |
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| Abstract: | Polysaccharide thickeners (alginate, carboxymethylated guar gum and carboxymethylated cellulose) used for the preparation of printing pastes, were recycled from printing paste residues and from wastewater concentrates, which were separated by ultrafiltration technique from wastewater after screen printing of cotton with reactive dyes. Concentrated aqueous polysaccharide solutions were studied via rheological measurements under steady and oscillatory shear conditions. Molecular weight averages and molecular weight distribution of thickeners were determined by size exclusion chromatography.A satisfactory fitting of viscosity data is obtained with the Cross equation and mechanical spectra are described with satisfactory approximation with the Friedrich–Braun model. The obtained parameters enable a quantitative interpretation of the changes in rheological properties. Moderate changes produced by thickener recycling on the shear-thinning and viscoelastic behaviour of polymers are a direct result of changes in molecular weight averages (MWA) and molecular weight distribution (MWD). |
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