Fibers and Polymers最新文献

In order to develop elastomer composite with high thermal conductivity based on polyester (PET) fabric and further prolong the service life and improve service safety, modified PET fabric was prepared. Initially, different content of carbon black was added into butadiene latex and phenolic resin to prepare complex emulsion. Then, the emulsion was coated on the fabric by dipping and rolling technique. The results showed that carbon black possessed excellent stability and could be dispersed in butadiene latex uniformly. Meanwhile, the viscosity of the complex emulsion was low. The absolute value of zeta potential exhibited that carbon black could promote the reaction of complex emulsion. In addition, the tensile properties and thermal conductivity were both improved after adding carbon black. When adding 5.3 wt% carbon black, the tensile strength of carbon black modified emulsion film could reach 6.57 MPa and the thermal conductivity could reach 3.16W/(m∙K). As a result, the thermal conductivity of 5.3 wt% carbon black modified emulsion-coated PET composite reached 3.43 W/(m∙K), which was 38.31% higher than that of pure emulsion modified PET composite. The results showed that carbon black was an excellent and low-cost nano-filler, which could be used to improve the thermal conductivity of PET-related elastomer composite.

Pollution of water caused by organic contaminants is a significant global environmental concern that has paid increasing attention. Polymeric photocatalytic membranes (PPMs) are attracting significant attention for their role in water purification, with benefits of both photocatalysis and membrane separation. In this study, we synthesized a hybrid CuWO₄/Ti₃C₂ MXene heterojunction and immobilized the as-prepared photocatalyst into a polyvinylidene fluoride (PVDF) membrane using phase inversion method to fabricate a photocatalytic membrane system. The CuWO₄/Ti₃C₂ heterostructure, prepared by the hydrothermal method, and immobilized CuWO₄/Ti₃C₂/PVDF membrane exhibit a significant activity in photocatalytic MB degradation performance which is 1.82 and 1.66 times higher than that of pure ones, respectively. This improvement is attributed to the energy band structure of the Schottky heterojunction, leads to enhanced charge transfer efficiency of photo-induced electrons from CuWO₄ to Ti₃C₂ and reduced electron–hole recombination, confirmed by Mott–Schottky and photoluminescence (PL) spectroscopy. Based on the obtained results, the immobilized CuWO₄/Ti₃C₂/PVDF membrane with a satisfactory reusability can be considered as a promising polymeric photocatalytic membrane for water treatment applications.

Graphical Abstract

Recent advancements in biotechnology and material science have led to the development of fibers infused with biologically active compounds, highlighting their potential in the textile industry. This research focused on creating functional viscose fibers embedded with menthol, a compound recognized for its antimicrobial properties. To address the volatility and insolubility of menthol, microencapsulation technology was employed to enhance its stability and solubility during the fiber production process. Polyurethane was selected as the shell material and the resulting microcapsules were successfully integrated into the viscose spinning process. The resulting fibers demonstrated excellent antimicrobial performance, indicating their promising application in antimicrobial textiles. This research emphasizes the viability of using microencapsulated bioactive compounds to enhance the functionality of textile materials.

This study investigates the use of easily accessible nano-biological materials with color change capabilities, antioxidant properties, and antibacterial characteristics. Utilizing electrospinning technology, curcumin-loaded composite elastic polyurethane nanoparticles were prepared and successfully integrated into pre-combed cotton web through a spraying and bonding process. Subsequently, the yarn was produced using traditional spinning methods, including coarse and fine yarn spinning. Cotton webs loaded with varying curcumin contents (1%, 2%, 3%, and 4% by mass) were successfully formed at a feed rate of 60 mm/s. The micro-morphology, macro properties, and functional characteristics of these webs were examined post-yarn spinning at 25 °C and a relative humidity of 60%. Scanning electron microscopy observations indicated that as the curcumin loading content increased, the distribution of curcumin nanoparticles on the cotton fiber surface became more uniform. This research seeks to address the effective loading of curcumin nanoparticles into yarn and to explore the impact of curcumin content on the properties of the resultant yarn.

This research provides a comprehensive investigation of the auxetic yarn (AY) production process, with the primary objective of developing an auxetic complex yarn that demonstrates a significant auxetic effect, emphasizing the distinctions associated with different core yarn quantities (1–8) in conjunction with a single wrap yarn. Two distinct classes of auxetic yarns (AYs) were developed through the combination of 1680 D spandex core yarn with either 150 D/3 or 210 D/3 polyester wrap yarn. AYs were fabricated in a high-speed braiding machine. An extensive examination was conducted regarding the tensile and deformation characteristics of the yarn to ascertain its negative Poisson ratio (NPR). Calculations of Poisson's ratio were conducted utilizing image processing software (Vistar Image 4.0 for Digital Camera). The findings indicate that axial stretching considerably affects the NPR. At the same time, lateral expansion is contingent upon the specific type of yarn, including variations in core yarns. Additional factors that affect these outcomes encompass the rotational speed of the spindle, the number of core yarns, and the linear density of the wrapped yarn. The prepared AYs can be employed in many applications, including personal and sports protective equipment.

Polyamide6/polyurethane fabrics (PA6/PU) are the main materials for preparing various tents. To enhance the durability of PA6/PU fabrics exposed to sunlight for a long time, environmental-friendly, harmless to humans and low-cost CaCl₂ is chosen as the surface modification agent to etch PA6 fabric during processing tent fabrics in the paper. The properties which are relative to the fabric durability are controlled by the complexation modification of PA6 fabric with CaCl₂ ethanol solution. The results show that the roughness of PA6 fiber after CaCl₂ modification is increased from 75.686 to 0.207 μm and the warp peeling strength of PA6-CaCl₂/PU fabric comes to 5.8N which is 46.5% higher than that of original PA6/PU fabric. At the same time, the loss of tensile strength for PA6-CaCl₂/PU fabric is less than that of PA6/PU fabric during heat aging process. On the other hand, Ca²⁺ presents an obvious effect on UV-C, while PU coating presents notable effect on UV-A and UV-B. The UPF value of prepared PA6-CaCl₂/PU fabric increased to about 16 due to the PU coating and the fabric presents improved heat insulation when enduring sunlight irradiation. The durable PA6-CaCl₂/PU fabric shows a promising application as tent fabric in textile industry.

Graphical abstract

The present work investigated the flexural and free vibration behavior of four different kinds of laminate composites consisting of glass fiber and different natural fiber-based. The proposed laminated composites are composed of four layers top and bottom layers are glass fibers and the middle two layers are different natural fibers, such as flax, kenaf, abaca-sisal and hybrid pineapple. The fabrication of the hybrid laminated composite structures is done via hand-layup techniques. The elastic constants of the laminated composites are determined by conducting the uniaxial tensile test in the INSTRON, 5967 as per ISO 527–5 standard. The numerical simulation is also performed using finite element (FE) software ABAQUS by adopting elastic properties from the uniaxial tensile test. Subsequently, the flexural behavior of the different hybrid laminated composites is investigated through the three-point bending test. Later, the effect of various geometric parameters, such as fiber angle orientation, aspect ratio, and side-to-thickness ratio, on the natural frequencies of the proposed hybrid laminated composites is analyzed using the finite element software ABAQUS under different boundary conditions. Subsequently, the development of the prediction model using an artificial neural network (ANN) is presented. The constructed model shows a strong alignment with the test results. A correlation of 0.9994 using the Levenberg–Marquardt training algorithm highlights a significant relationship between the predicted and the experimental outcomes of the artificial neural network model.

Spandex–nylon blend fabrics (SNBF) are extensively utilized across various applications owing to their exceptional resilience and soft texture. However, inherent differences in the properties of spandex and nylon result in significant color difference after one-bath dyeing. This study aimed to enhance the dyeing efficiency and homogeneity of blended fibers by modifying the fibers and optimizing the dyeing process. Molecular structure analysis, single-factor experiments, and orthogonal experiments were employed to analyze the dyeing process and ascertain the optimal procedures. The results indicated that the optimal dyeing effect was achieved with a modifier concentration of 1% (o.w.f.), a dye concentration of 2% (o.w.f.), a pH value of 4, a dyeing temperature of 95 °C, and a dyeing time of 55 min. Under these conditions, the dye exhaustion (E%) reached as high as 95.4%, the homochromaticity balance value (K) was reduced from 4.74 to 1.12, and the colorimetric deviation (ΔE) was reduced by 92.2%. This process is not only suitable for one-bath dyeing of SNBF with a variety of acid dyes but also reduces temperature and time consumption, offering a novel and efficient method for one-bath dyeing of blended fibers.

Polylactic acid (PLA) membranes offer advantages such as biodegradability, non-toxicity, and biocompatibility for oil–water separation. However, it remains challenging to fabricate PLA membranes with sufficient mechanical strength and hydrophobicity for practical applications. In this study, a superhydrophobic fibrous membrane based on PLA and Polybutylene terephthalate adipate (PBAT) is prepared via electrospinning, followed by a high-humidity treatment. The effects of PBAT content and high humidity treatment on the morphology, hydrophobicity, and mechanical properties of PBAT/PLA composite fiber membranes are investigated. The results show that the introduction of PBAT effectively enhances the fiber diameter, crystallization, hydrophobicity, and mechanical properties of PBAT/PLA fibers. Moreover, the high humidity treatment further improves the mechanical and hydrophobic properties of the membranes. When 0.2 g of PBAT is added and the high humidity treatment lasts for 24 h, the resulting PBAT/PLA fibrous membrane exhibits an outstanding water contact angle (WCA) of 158.23°, tensile strength of 3.802 MPa, excellent oil–water separation flux (6500 L/(m²·h)), and efficiency of 99.80%, demonstrating great potential for oil–water separation applications.

Multifunction of silk fabrics were prepared by adopting glutaraldehyde, chitosan (CS) and graphene oxide (GO). Pure silk fabric was firstly impregnated with a mixture of CS and glutaraldehyde solution forming CS-silk and then immersed into GO dispersion, of which the GO adsorbed on silk fabric was reduced to obtain reduced graphene oxide (RGO)/CS-silk fabric. The effects of mass fraction of CS and mass concentration of GO dispersion on the electrical conductivity, ultraviolet resistance and antibacterial properties of RGO/CS-silk fabrics were investigated, and the washability of the silk fabrics were tested. The results showed that the GO deposited on the surface of RGO/CS-silk fabric was reduced to RGO, and the surface covered with a continuous RGO/CS film. The conductivity of RGO/CS-silk fabric increased with the increase of GO dispersion concentration, which is mainly due to the good conductivity of RGO. The RGO/CS-silk fabric modified by 2% CS solution and treated by 5 g/L GO dispersion solution has the best conductivity, and the surface resistance was 1.13 kΩ/cm. RGO and CS synergistically enhanced the bacteriostasis of RGO/CS-silk fabric, and the antibacterial rate was up to 95%. The RGO/CS-silk fabric modified by 0.5% CS solution and treated by 5 g/L GO dispersion has little change in conductivity, bacteriostasis and ultraviolet resistance after 30–50 washing circles.