Fibers and Polymers最新文献

This paper investigates the new graphene fibre primary performance, taking the winter multifunctional knitted fabric with heat and antibacterial as the starting point. Using 150D graphene yarn, ordinary polyester yarn and 40S cotton yarn as the main raw materials, six yarn ratios were designed through the blending process and the HFX-A6 multi-functional spinning frame was used to manufacture the yarn, and then 11 knitted fabrics with three organizational structures were knitted using a 36G single-sided circular knitting machine. Based on the effects of graphene yarn content and fabric organization structure on the essential performance, we investigated the fabrics’ thermal and humidity comfort and antimicrobial properties. The conclusion shows that increased graphene content enhances the knitted materials’ performance. The addition of graphene content significantly affects fabrics’ heat generation and antimicrobial properties. It provides an important reference for the development and preparation of multifunctional hygroscopic hot knitting materials with specific practical value in winter.

In this study, to evaluate color emotions and color preferences of cotton fabric having two different colored portions with contrast tones by dyeing with persimmon and indigo, respectively, six different stimuli were prepared with variations of contrasting tone types and color area ratios and they were subjectively assessed by inviting female college students in fashion and textiles. The factor analysis results showed four different factors including ‘Light’, ‘Gentle’, ‘Traditional’, and ‘Dynamic’ and they were revealed as effected by contrasting tone types such as ‘pale-dull’ and ‘light-dull’ and by color area ratios such as 1:1, 2:1, and 1:2 as well as objective colorimetric combination variables. Precisely the type of ‘pale-dull’ contributed to stronger feeling of factor ‘Light’ and ‘Gentle’ and the ratio of 2:1 evoked more perception of ‘Light’. Color preference was more highly rated for ‘pale-dull’ and as (Delta {a}_{p}^{*}) as a colorimetric combination variable was higher. Finally color emotion factor such as ‘Light’ and ‘Traditional’ and color preference were quantitatively described by modeling each of them with some of objective colorimetric combination variables.

Most functional hydrogels have biocompatibility problems in the pursuit of high performance, and there is an urgent need to study the problem of maintaining good biocompatibility and making hydrogels both multifunctional. Here, this paper proposes polyvinyl alcohol (PVA), chitosan quaternary ammonium salt (HACC) and polyacrylamide (PAM) with good biocompatibility as hydrogel substrates and nano-ferric copper-zinc oxide (nFCZ) as the main antimicrobial source. The physicochemical double crosslinked network hydrogels were prepared using one-pot method. Finally, the conductive properties of the hydrogel were enhanced by soaking in CaCl₂ solution, and the PHP dual-network conductive antimicrobial composite hydrogel was prepared. The hydrogel was characterised, tested and analysed through various tests. The results showed that the obtained dual-network composite hydrogels had good mechanical properties, stable sensing properties, excellent swelling rate, biocompatibility and antimicrobial activity, and the bacterial inhibition rate against Escherichia coli and Staphylococcus aureus was higher than 99%. The stable electrical conductivity and sensing properties promote cell regeneration at the wound site, which broadens the scope of hydrogel applications in biomedical fields.

Resulting properties of cotton and polyester blends make polycotton the most common fabric in textile industry. Separation technologies are key for the chemical processing of the massive amount of polycotton waste produced worldwide. The very different chemical nature of cellulose and polyethylene terephthalate determines the fractionation strategies to obtain two valuable monomaterial streams. In this work, we propose separation pathways seeking the conversion both polymers. First, polyester was depolymerised into its monomeric units through catalytic alkaline hydrolysis. The combined effect of alkali concentration and the catalyst was analysed to overcome the hydrophobic nature of polyester and optimise its conversion rate minimising the damaged caused to the cellulose chains. Conversion rates up to 80% were reached in a single separation stage with a limited effect of the polymer chain distribution of cellulose which remains a fiber-grade feedstock. Alternatively, cellulose was fully removed by selective dissolution in ionic solvent and subsequent filtration resulting in a spinnable mixture. Finally, enzymatic treatments for the conversion of cellulose into fermentable sugars were studied. Single stage conversions of 65% were achieved after maximizing the enzymatic activity. Structural and spectroscopic analysis showed that crystalline domains of textile-grade cotton limit the enzymatic activity. Optimal fractionation process is, in our view, highly context dependent what conveys to seek a variety of alternatives seeking for chemical processes driven by the ulterior up-cycling of the monomaterial streams

Untreated natural cotton fabrics are hydrophobic due to the high content of pectin and waxes, and the fabrics need to improve the wettability by scouring for the demands of the subsequent processing such as dyeing and finishing. In this study, a new scouring method for cotton fabrics was developed by pectin hydrolase combined with Fenton system (Fe²⁺/H₂O₂). The mechanism of pectin degradation by pectinase combined with Fe²⁺/H₂O₂ was investigated. The results showed that α-1,4-glycosidic bonds of water-soluble pectin could be degraded more efficiently by pectinase hydrolysis and Fe²⁺/H₂O₂ oxidation. The fabrics scoured with pectinase → Fe²⁺/H₂O₂ had less wetting time (4.25 s) and higher vertical wicking height (9.80 cm) compared to the fabrics treated with pectinase alone (> 120 s, 5.15 cm). The results of bleaching and dyeing experiments indicated that the whiteness and dyeing properties of the fabrics were not negatively affected by pectinase → Fe²⁺/H₂O₂ treatment, and the strength loss of the fabrics (11.79%) was lower than that of the fabrics with conventional NaOH treatment (20.16%). The results of the experiments in the pilot-scale machine showed that various performance indicators of the fabrics scoured by pectinase → Fe²⁺/H₂O₂ reached the level of the conventional NaOH treatment, which demonstrated the possibility for practical application of pectinase → Fe²⁺/H₂O₂ scouring. The cotton fabric scouring using pectinase → Fe²⁺/H₂O₂ is an effective and feasible new method with advantages such as environmental friendliness, mild treatment conditions, and good treatment effect.

A polypyrrole (PPy) is an intrinsic conducting polymer, known for its excellent electrical conductivity and found suitable for use in electronic and electrical devices, including sensors, actuators, and conductive coatings. In spite of many advantages polypyrrole (PPy) is not much researched in thermoelectrical applications. This paper presents a comparative analysis of thermoelectric characteristics of polypyrrole-coated cotton, silk, and polyester fabrics. An in-situ chemical polymerization method is used to coat the textile fabrics with PPy in aqueous solution using ferric chloride as oxidant. Thermocouples are developed using PPy-coated textiles as p-type and metallic copper as n-type conductors. Various thermoelectric characteristics of the PPy-coated fabrics, such as electromotive force (emf) vs temperature gradient, power factor, figure of merit, and temperature vs Seebeck coefficient, are plotted and compared. PPy-coated cotton fabric shows the best thermoelectric performance among all thermoelectric fabrics. The electrical conductivity of the PPy-coated cotton, silk, and polyester fabrics are measured as 97.42 S/m, 37.28 S/m, and 66.22 S/m, respectively. Seebeck coefficients of PPy-coated cotton, silk, and polyester thermoelectric fabrics are found to be 16.5 μV/K, 14.14 μV/K, and 12.68 μV/K, respectively. The highest power factors of the PPy-coated cotton, silk, and polyester fabric/copper thermocouple are found to be 16.16 × 10^–3 µWm⁻¹ K ⁻², 3.42 × 10^–3 µWm⁻¹ K ⁻², and 3.51 × 10^–3 µWm⁻¹ K ⁻², respectively. At an absolute temperature of 277 K, the thermoelectric figures of merit for PPy-coated cotton, silk, and polyester/copper thermocouples are found to be 1.31 × 10^–4, 0.315 × 10^–4, and 0.483 × 10^–4, respectively. Field-emission scanning electron microscopy (FE-SEM) study reveals that the coating of PPy over the textile surface is uniform with granular morphology. FTIR study confirms significant intermolecular interaction between the textile fibres and PPy molecules. Differential scanning calorimetry analysis (DSC) and thermogravimetric analysis (TGA) of the PPy-coated textiles are done for comparative analysis of thermal behaviour of the materials. X-ray diffraction (XRD) analysis of PPy-coated textiles denotes the penetration of PPy molecules into the amorphous zone of the fibres.

In this study, a novel surface dye molecularly imprinted bacterial cellulose nanofiber nonwoven (DMIBC) has been successfully prepared using two-step process by surface molecule-imprinting method combined with electrospinning technique to improve the selective adsorption capacity using methylene blue (MB) dye molecule as the target pollutant. Scanning electron microscopy, surface area and Fourier transform infrared spectroscopy were used to characterize with the physico-chemical characteristics of the prepared DMIBC. The as-prepared DMIBC nanofiber nonwoven has small average nanofiber diameter of 172.6 ± 17 nm with large specific surface area of 233.64 ± 22.6 m²/g, which are favorable for adsorption. To systematically investigate the adsorption performances such as adsorption capacity and selectivity coefficient of the prepared DMIBC-MB nano-adsorbent for MB dye molecules, the effect of solution pH value, initial dye molecule concentrations, adsorption time, solution temperature and competitive dye molecules has been studied. The maximum adsorption capacity of 4250 mg/g can be reached at pH value of 6.0. The calculated adsorption selectivity coefficients and molecule imprinting factors suggest that DMIBC-MB nano-adsorbent possesses excellent adsorption selectivity for imprinted MB dye molecule. The dye adsorption isotherm models and kinetics models were also applied to analyze the adsorption mechanism of DMIBC nano-adsorbent for MB dye molecules. Durability test indicated that the adsorption capacity of DMIBC nano-adsorbent could remain 92.1% of the initial adsorption capacity after 10 consecutive regeneration cycles. In general, the DMIBC nano-adsorbent with highly selective removal of MB dye molecules could be applied for dye wastewater treatment.

Virtual simulation design revolutionizes the way clothing is created and developed, offering designers greater flexibility, efficiency, and creativity in bringing their ideas to life. This study delves into the virtual simulation design of Mazu clothing, a traditional Chinese fashion style, utilizing digital design tools such as Corel Draw, clothing CAD, and CLO 3D. The research aims to preserve cultural heritage by meticulously examining the design aspects of Mazu attire, including style, structure, color, and material. Through literature review and analysis, the fundamental characteristics of Mazu culture and attire are elucidated. The study employs CorelDraw X4 for sketching Mazu attire’s style structure, and rich peace clothing CAD software for pattern drawing, based on standard female body size data. The pieces are decomposed according to the attire’s structural composition to finalize the pattern design. CLO 3D software is utilized for 3D virtual stitching and simulation design, simulating the clothing production process with commendable accuracy. The study demonstrates that dynamic and static virtual displays of Mazu attire can be swiftly achieved, laying the groundwork for digital design and application of traditional attire. Overall, this research provides a detailed and systematic approach for creating virtual versions of Mazu clothing, confirming the accuracy and practicality of the virtual design method while offering insights for future research on digital simulation and virtual display of traditional attire.

The climate change is accelerating with the increase in the concentration of carbon dioxide (CO₂) in the atmosphere. CO₂ capture and conversion are effective strategies for stabilizing such environmental conditions. In this study, a series of melamine-based porous organic polymers (POPs), each incorporating different aromatic aldehydes as linkers, were synthesized. The POPs (MPOP-6C, MPOP-6N, MPOP-5N, and MPOP-5O) were characterized by Fourier-transform infrared spectroscopy, solid-state ¹³C nuclear magnetic resonance, X-ray diffraction, thermogravimetric analysis, and high-resolution field-emission scanning electron microscopy. The gas adsorption characteristics, including adsorption–desorption isotherms, pore size distribution, and adsorption at 298 and 323 K, were assessed through a Brunauer–Emmett–Teller analysis. The cycloaddition of CO₂ with styrene oxide was performed using POPs as catalysts for conversion to styrene carbonate. Melamine-based POPs bearing heterocycles with high π-electron densities exhibited enhanced CO₂ selectivity performances. MPOP-6N, which incorporated a pyridine motif, exhibited a notable enhancement in the conversion rate among the synthesized catalysts.

With the growing concern for health and wellness, many textile mills are witnessing a surge in demand for antimicrobial and anti-viral treatments on fabric. The black cumin seed (BCS) is blessed with various antioxidants and antimicrobial active agents, and can be used to develop antimicrobial fabric. The current study aims to prepare a stable emulsion with BCS oil to apply on casual knitted fabric to investigate its anti-bacterial properties. The homogenous emulsions were prepared with Tween-80 surfactant and applied to the fabric by exhaust method. Thus, the emulsions were stable at various temperatures. The surface functional groups of treated fabric were characterized with FT-IR spectroscopy and the surface morphology was visualized with SEM images to confirm the modification. The FT-IR spectrum of treated fabric guaranteed successful modification, presenting the major surface functional groups in the treated fabric. The SEM images further confirmed this phenomenon as the treated fabric exhibited cemented layer deposition of BCS emulsions. The anti-bacterial activity of treated fabric against Bacillus subtilis microbes was measured using the Kirbey–Bauer method. The result showed that the treated fabric demonstrated anti-bacterial activity against B. subtilis with an inhibition zone of 8 mm. The resistive activity against the target bacteria was found active even after a single wash. This was proven through the optical density test which indicated that the fabric can be used for healthcare PPF securing their antimicrobial and anti-viral properties.

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