Functional textiles with desirable protective properties (i.e., high cut‐, stab‐, and abrasion resistance) and wearability (i.e., excellent flexibility and permeability) remain unmet goals for personal protective equipment. Herein, inspired by crocodile skin, a unique and soft‐rigid unified structure (SRUS) is reported by integrating rigid protective blocks onto a soft textile substrate while obtaining a high cut‐, stab‐, and abrasion‐resistant composite textile that is flexible, waterproof, and breathable. Rigid blocks, consisting of epoxy resin reinforced by inorganic powders, strongly adhere to the soft textile surface with small intervals between each other via a pattern‐controllable integrated molding (PCIM) approach. Consequently, the SRUS design guarantees superior protective performance through rigid protective blocks and satisfactory flexibility and permeability via soft textiles and intervals. The SRUS textile achieves excellent cut‐resistance (58 N), the highest grades of stab‐ (38 N) and abrasion‐resistance (600 r mg−1), and good flexibility (65 mN cm) and permeability (60 mm s−1) values, indicating a distinct combination of desirable protective and wearable performance. The proposed SRUS protective textiles, incorporating the PCIM approach, offer a novel strategy for manufacturing functional soft composite textiles that combine high protective performance and good wearability, opening up a new avenue for the development of personal protective equipment.
Soft‐Rigid Unified Structure Textile In article number 2213419, Swee Ching Tan, Songlin Zhang, Yan Ma, and co‐workers developed a composite textile with a soft‐rigid unified structure (SRUS) design inspired by crocodile skin. The SRUS textile combines excellent protective properties and wearing comfort, providing a new approach to personal protective equipment development. The study shows the potential of biomimetic design in creating innovative functional textiles.
With the continuous promotion of urbanization, the generation of construction and demolition waste (CDW) is increasing. The environmental problems and safety hazards caused as a result need to be resolved. In this paper, based on the system dynamics (SD) theory, the modeling, the cost, and the environmental benefit of CDW resource management under the life cycle assessment (LCA) are proposed. Specifically, we propose a combined policy derived through three variables, namely, fines, subsidies, and charges. The target is to reduce illegal dumping behavior and landfill volume and to improve the recycling volume and environmental benefits. The model is constructed with the help of the software VENSIM, and the validity and feasibility of the model are demonstrated with data from Nantong City. The results show that a single policy cannot simultaneously improve environmental benefits, illegal dumping, recycling, and landfill behavior. A combined policy combines the advantages of three single policies, fines, subsidies, and charges, which not only can effectively curb illegal dumping and landfill disposal under the premise of prioritizing environmental benefits, but can also promote the recycling of CDW. The reasonable range for the fine is 300–350 CNY/ton; the rational range for subsidies is 30–40 CNY/ton; and the flexible range for treatment charge is 40–80 CNY/ton. The model can be used for the quantitative assessment of urban CDW management costs and environmental benefits and can also provide a theoretical basis for the government.
When hydrophilic materials (such as natural fiber, epoxy resin or concrete) compose sandwich structures, the moisture absorption from hydrothermal environments may significantly affect their mechanical properties. Although some experimental works were carried out, few mathematical efforts have been made to describe the moisture diffusion of multiphase symmetrical sandwich structures thus far. In this paper, the moisture diffusion equation was developed to effectively predict the moisture diffusion behavior of multiphase symmetrical sandwich structures as the function of aging time. Both finite element analysis (FEA) and experimental works were carried out to validate the accuracy of the analytical method, and the analytical results show a good agreement with FEA and experimental data. The effect of the interface condition on the concentration at the interfaces was discussed; the difference between concentration and normalized concentration was illustrated; the correct interface condition, which is a continuous normalized concentration condition, was explained for the moisture diffusion behavior of sandwich structures.
Inorganic powders (IPs), including SiO2, Al2O3, and Ca3Si3O9, were used as reinforcements and thermosetting epoxy resin was utilized as a matrix to manufacture IP/epoxy preform. The effects of stirring speed on the physical and mechanical properties of IP/epoxy composites were analyzed. Results showed that the tensile, flexural, and impact mechanical properties of IP/epoxy composites generally increased first and then decreased with the rise in stirring speed. They improved by 27.03%, 13.75%, and 8.78% when the stirring speed was 1000 r·min−1. When the stirring speed was less than 1000 r·min−1, the IP was unevenly distributed and prone to agglomeration and had weak junctions, which resulted in poor mechanical properties. When the stirring speed exceeded 1000 r·min−1, the particles with larger sizes were centrifuged, the powder was dispersed unevenly again, and the strength decreased.
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