Journal of Textiles and Polymers
Volume:10 Issue: 4, Autumn 2022

Simulation of fabric behavior under different conditions is very important for optimizing the garmentmanufacturing process and improving garment design software programs. This study presents a numericalmodel for simulating and predicting seam puckering in woven fabrics. For this purpose, the yarn-levelmodel simulation method was used. Based on this simulation technique, the behavior of the individualthreads of the fabric structure and the sewing threads are modeled separately. Then their effect on eachother is considered in the general model. In order to use the model in simulating the seam puckering ofreal samples, the effective properties of fabric structure and sewing threads, as well as sewing tensionand sewing density, were measured and then applied to the model. Real and simulated samples werecompared using indices defined based on the waveforms of seam wrinkling. The results showed that thismodel is able to simulate the degree of seam puckering of the fabric with an average error of 9.4%.

Polyvinylidenefluoride (PVDF) as a piezoelectric material, is widely used due to its desirable mechanicalproperties. The combination of PVDF with polyurethane (PU) creates a polymer alloy with high elasticproperties that allows the tensile force to be applied to the polymer alloy and its reversibility afterforce removal. This study aimed to generate the electric current from PVDF/PU polymer alloy withoutdirect pressure or impact, with the new method under cyclic tensile loading. The results showed that thepolymer alloy layer, under cyclic tensile loading, generates an electric current and the electric voltagebetween 3 mV to 8 mV. The applied tensile force created a compressive force on the body of the layer.PVDF created an electric current due to this compressive force. The fibers were aligned in the polymerlayers to improve energy harvesting. The electric current from the layers was measured and comparedbefore and after the fiber alignment. Fiber alignment was performed by increasing the rotation speed ofthe collecting drum. The results showed that increasing the speed of the collecting roller by 10 times,lead to an increase in the electric current generation by 27%.

The color behavior of the polypyrrole electrochromic films (PEFs) doped with three types of dopants;perchloride (ClO4-), the anionic surfactant of sodium dodecyl sulfate (SDS), and dye molecule of acid red18 (AR18) was analyzed with a spectroelectrochemical device. The spectroelectrochemical properties ofthe films were obtained at different potentials between ±1V and in the wavelength range of 300-1100 nm.The color coordinates of the films were calculated using CIELAB, CIExyY, and the RGB of characterizeddisplay color spaces. The results showed that the color of the PEFs at neutral and redox states can bechanged by the use of different dopants, especially the dye molecule. Also, in the presence of the AR18,the color gamut of the PEFs changed and expanded. In addition, the CIELAB color differences betweenreduction (-1V) and oxidation (+1V) states in PPy/ClO4-, PPy/AR18, and PPy/SDS were 32, 38, and 42,respectively.

This research has been conducted with the objective of multi-functional finishing on cotton fabric forimproving different properties such as photocatalytic activity, electrical conductivity, UV blocking, andantibacterial. To this end, in situ synthesis of graphene/zinc stannate nanocomposite was carried outand its effect on the cotton properties was investigated. The structure and morphology of the fabricsurface has been examined by field emission scanning electron microscopy (FE-SEM) and its chemicalstructure has been elucidated by X-ray photoelectron spectroscopy (XPS). The electrical conductivityof coated fabrics was improved significantly due to the presence of graphene on the surface of cottonfabrics. The photocatalytic activity of the treated fabrics with graphene/zinc stannate nanocompositewas tested by degradation of methylene blue in aqueous solution under sunlight irradiation, whichdemonstrated excellent photocatalytic efficiency of the nanocomposite. The antibacterial activities of thesamples against two common pathogenic bacteria including Escherichia coli and Staphylococcus aureushave been also assessed, which suggested that the graphene/zinc stannate nanocomposite can functioneffectively as antibacterial agents. Moreover, the nanocomposite finished cotton fabric showed properUV blocking activity.

In this study, the dyeing with Hibiscus sabdariffa extract in the presence of metal mordants was studied.In order to evaluate the effect of the dyeing method on the color parameters of the samples, three premordanting, simultaneous and after-mordanting methods were used using iron sulfate, copper sulfate,aluminum potassium sulfate, zinc chloride and citric acid as mordant materials in dyeing. Evaluation ofcolor strength and color parameters of the samples was performed using a reflective spectrophotometerand wash and light fastness were done based on standards. The results show that the fabric was dyed withnatural dye of H. Sabdariffa without the presence of mordant are not suitable for the textile industry interms of color strength and color fastness. Mordanting with different metal mordants and using differentdyeing methods can increase the color strength and wash and light fastness and cause excellent washfastness (grade 5) and very good light fastness (grade 5 to 6). A comparison of dyed samples shows thatthe change of mordant type in the simultaneous dyeing method has a greater effect on the color propertiesof the samples than pre- and post-mordanting methods.