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The Effect of Manufacture Process on Mechanical Properties and Burning Behavior of Epoxy-Based Hybrid Composites
The production of hybrid layered composites allows comprehensive modification of their properties and adaptation to the final expectations. Different methods, such as hand lay-up, vacuum bagging, and resin infusion were applied to manufacture the hybrid composites. In turn, fabrics used for manufacturing composites were made of glass (G), aramid (A), carbon (C), basalt (B), and flax (F) fibers. Flexural, puncture impact behavior, and cone calorimetry tests were applied to establish the effect of the manufacturing method and the fabrics layout on the mechanical and fire behavior of epoxy-based laminates. The lowest flammability and smoke emission were noted for composites made by vacuum bagging (approximately 40% lower values of total smoke release compared with composites made by the hand lay-up method). It was demonstrated that multi-layer hybrid composites made by vacuum bagging might enhance the fire safety levels and simultaneously maintain high mechanical properties designed for, e.g., the railway and automotive industries.
Journal Article
A Review of Electromagnetic Shielding Fabric, Wave-Absorbing Fabric and Wave-Transparent Fabric
As the basic materials with specific properties, fabrics have been widely applied in electromagnetic (EM) wave protection and control due to their characteristics of low density, excellent mechanical properties as well as designability. According to the different mechanisms and application scenarios on EM waves, fabrics can be divided into three types: EM shielding fabric, wave-absorbing fabric and wave-transparent fabric, which have been summarized and prospected from the aspects of mechanisms and research status, and it is believed that the current research on EM wave fabrics are imperfect in theory. Therefore, in order to meet the needs of different EM properties and application conditions, the structure of fabrics will be diversified, and more and more attentions should be paid to the research on structure of fabrics that meets EM properties, which will be conductive to guiding the development and optimization of fabrics. Furthermore, the application of fabrics in EM waves will change from 2D to 3D, from single structure to multiple structures, from large to small, as well as from heavy to light.
Journal Article
Hydrophilic Modification of Polyester/Polyamide 6 Hollow Segmented Pie Microfiber Nonwovens by UV/TiOsub.2/Hsub.2Osub.2
Polyester/polyamide 6 hollow segmented pie bicomponent spunbond hydro-entangled microfiber nonwovens (PET/PA6) with a microfilament structure have recently emerged in many markets around the world due to their green, high-strength, and lightweight properties. However, PET/PA6 is highly hydrophobic, which inhibits its large-scale application at present. In order to enhance the hydrophilic performance of PET/PA6, many methods have been applied, but the effects are not obvious. Ultraviolet (UV) irradiation treatment has proven to be an effective method to improve the hydrophilicity of fabrics. Herein, the aim of this paper was to investigate hydrophilic modification of PET/PA6 by UV/TiO[sub.2]/H[sub.2]O[sub.2]. The effect of H[sub.2]O[sub.2], nano-TiO[sub.2], and UV irradiation time on the morphology, elemental composition, hydrophilic properties, and mechanical properties of PET/PA6 were systematically investigated. The results showed that the modified microfibers were coated with a layer of granular material on the surface. It was found that the C 1s peak could be deconvoluted into six components (C-C-C, C-C-O, O-C=O, N-C=O, N-C-C, and C-C=O), and a suitable mechanism was proposed. Moreover, the water contact angle of PET/PA6 modified by 90 min irradiation with UV/TiO[sub.2]/H[sub.2]O[sub.2] decreased to zero in 0.015 s, leading to the water vapor transmission rate and the water absorption reaching 5567.49 g/(m[sup.2]·24 h) and 438.81%, respectively. In addition, the modified PET/PA6 had an excellent liquid wicking height of 141.87 mm and liquid wicking rate of 28.37 mm/min.
Journal Article
Advanced textiles for health and well-being
An authoritative and comprehensive survey of the latest developments in high-tech textiles.
Book
Woven fabric triboelectric nanogenerators for human-computer interaction and physical health monitoring
Triboelectric nanogenerator (TENG) converts mechanical energy into valuable electrical energy, offering a solution for future energy needs. As an indispensable part of TENG, textile TENG (T-TENG) has incredible advantages in harvesting biomechanical energy and physiological signal monitoring. However, the application of T-TENG is restricted, partly because the fabric structure parameter and structure on T-TENG performance have not been fully exploited. This study comprehensively investigates the effect of weaving structure on fabric TENGs (F-TENGs) for direct-weaving yarn TENGs and post-coating fabric TENGs. For direct-weaving F-TENGs, a single-yarn TENG (Y-TENG) with a core-sheath structure is fabricated using conductive yarn as the core layer yarn and polytetrafluoroethylene (PTFE) filaments as the sheath yarn. Twelve fabrics with five different sets of parameters were designed and investigated. For post-coating F-TENGs, fabrics with weaving structures of plain, twill, satin, and reinforced twill were fabricated and coated with conductive silver paint. Overall, the twill F-TENGs have the best electrical outputs, followed by the satin F-TENGs and plain weave F-TENGs. Besides, the increase of the Y-TENG gap spacing was demonstrated to improve the electrical output performance. Moreover, T-TENGs are demonstrated for human-computer interaction and self-powered real-time monitoring. This systematic work provides guidance for the future T-TENG’s design.
Journal Article