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Stały URI dla kolekcjihttp://hdl.handle.net/11652/4411
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Pozycja Natural dyeing of recycled cotton and polyester-cotton blended yarns with chitosan biomordant(Wydawnictwo Politechniki Łódzkiej, 2022) Gisbert-Payá, Jaime; Uysal, Serkan; Capablanca, Lucía; Toprak-Cavdur, TubaStudies on recycling and natural dyeing have gained great importance for the textile sector, which creates the most pollution and causes significant problems. Chitosan and its forms with their versatile properties are of great importance for many industrial areas from textiles to medicine. In this study, the effects of different-molecular-weight-chitosans as biomordants on the natural dyeing of recycled cotton and cotton-polyester yarns were investigated. The colorimetry results showed that while chitosan increased the yellowness and chroma of the colors, it decreased their redness, it is caused the colors to shift towards orange-yellow region. This change could be mitigated by changing the conditions under which the dyeings were conducted. Medium molecular weight chitosan was more effective in these changes than the low ones. Although there were changes in the angles of the colors, it was observed that the color strengths increased with the rise of the chitosan concentration. Although higher color strengths were obtained from dyes without chitosan, the increase in color depths with the increase of chitosan concentration revealed that chitosan could be used as a mordant. The good washing fastness obtained were explained by the low color strengths or the strong binding of chitosan and dye to the fiber.Pozycja Fiber cross-section influence on the deposition of nanofibers on textile weaved structures(Wydawnictwo Politechniki Łódzkiej, 2022) Mínguez-García, David; Capablanca, Lucía; Montava, Ignacio; Díaz-García, PabloRoughness is directly related to the increase of adhesion between surfaces. Different cross section on fibres implies different longitudinal shape of fibres, altering the roughness of filaments. In this study, a procedure to evaluate the nanofibers adhesion to the substrate has been designed. In order to test it, different cross-section shapes are evaluated to demonstrate its influence on the nanofibers net adhesion. Circular, tetralobal and trilobal fibres were tested. Focused on corroborating it, two yarns with different filament fineness were also tested. Different weights are placed on an acetate film which is placed on the nanofibers net. The pressure helps the nanofiber to move to the acetate. This procedure helps to determine the influence of fibre cross-section or roughness, demonstrating the adhesion of nanofibers net on the structures is enhanced with higher roughness.Pozycja Estimating biodegradation of cotton fabric by soil burial(Wydawnictwo Politechniki Łódzkiej, 2022) Sánchez-Martínez, Ainhoa; Belda-Anaya, Raquel; Capablanca, Lucía; Payá, Jaime Gisbert; Bonet-Aracil, MarilésToday we can see a greater awareness of sustainability and environmental protection, however, there are many environmental impacts that are not measured and therefore taking measures to minimize them is not easy. In this article we intend to evaluate the biodegradability of a cotton fabric through the generation of one of the greenhouse gases, CO2. For this, the cotton fabric is buried in an artificial ecosystem and accelerated aging is carried out. The results show that the biodegradability of cotton fabric is around 70-80% of the biodegradability of cellulose.