Development of tri-layer breathable fluid barrier nonwoven fabrics for surgical gown applications

In this study, tri-layer fabrics for surgical gown applications were developed using polypropylene spunbond, polypropylene melt-blown and polyester/rayon spunlace (hydro-entangled) nonwoven layers with the aid of a fusing machine and polypropylene powder as the bonding agent. Weight, thickness, bending rigidity, grab tensile properties, bursting strength, air permeability, water vapour transmission rate, hydrostatic pressure, water resistance (impact penetration test), and synthetic blood repellency of the fabrics (unfinished and finished with water repellent polymethylhydrosiloxanes solution) were measured and the data was statistically analyzed. The results showed that the finished fabric composed of the spunbond outer layer, melt-blown middle layer, and spunlace inner layer, meets the blood repellency requirements of level 4 protection according to the barrier protection classification of Association for the Advancement of Medical Instrumentation (AAMI). The other samples, i.e. untreated type of abovementioned sample and treated and untreated tri-layer of spunbond, melt-blown, spunbond samples offer level 2 protection according to AAMI classification.     

防水透湿织物湿传递性能研究（英文）

为了了解在实际穿着过程中，防水透湿织物防水透气原理，本文进行了休息、运动及雨淋三种人体穿着实验，实验在人工气候室中进行，选择了三种方水透湿服和一件不锈湿的一般雨主来评估其穿着时衣服内的湿度变化，实验结果表明，防水透湿织物因其良好的防水锈湿性能，而具有良好的穿着舒适性。     

Engineered Smart Textiles and Janus Microparticles for Diverse Functional Industrial Applications

Janus materials are biomimetically inspired systems with two or more functional properties arising as paramount materials for utilization in different fields like Medical, Protective clothing etc. Janus particles can be in different forms like capsule, fiber, nano cage, disc, nano film etc. which are amalgamated with fabric by different processes. Based on the fabrication and constituent elements, Janus materials can be fabricated by incorporating multiple properties like fire-retardancy, catalytic property, thermal regulation etc. This review article enumerates the numerous industrial applications of the Janus fabrics and simultaneously outlines the extensive methodologies utilized for engineering of the Janus fabrics.     

消防服用棉型多层织物系统透湿性测试与分析

文章采用YG(B)216X型织物透湿仪对五种外层面料及五种多层织物系统进行透湿性能测试,筛选出性能最佳的消防服多层织物系统,并对织物透湿性与其结构参数相关性进行分析研究。试验结果表明:3#多层织物系统为消防战斗服的最佳选择;织物厚度和平方米克重与织物的透湿性成反比关系;而对于覆膜织物层压于织物的PTFE膜本身也会对水蒸气的透过量有一定的影响。     

防水透湿涂层织物的现状及发展趋势

介绍了防水透湿涂层织物的现状,并按防水透湿原理,涂层剂种类,防水透湿织物的性能等方面对它进行分别叙述。分析了其发展趋势,介绍了防水透湿涂层技术在皮革工业中的应用。     

Breathable polymer films produced by the microlayer coextrusion process

Fabrication of a breathable film by the microlayer coextrusion process is described. Poly(ethylene oxide) (PEO) was microlayered with a filled polyolefin, either CaCO₃‐filled polyethylene or CaCO₃‐filled polypropylene. The thickness of individual layers was varied by increasing the total number of layers in the microlayered film from 8 to 4096. The water vapor transport rate (WVTR) was measured for microlayer films that varied in composition and number of layers. Especially with the PP(CaCO₃)/PEO system, systematic variation in composition and number of layers made it possible to obtain large changes in the WVTR. The results were related to the tortuousity of the pathway through the microlayer. The filled polyolefins acted as a barrier to water vapor transport through the hydrophilic PEO. As the individual layers were made thinner by increasing the total number of layers, the polyolefin layers changed from continuous to discontinuous. Tortuousity concepts were used to correlate the increase in WVTR with an effective aspect ratio of the discontinuous polyolefin layers. In addition to high WVTR values, the breathable films produced by microlayering PEO with a filled polyolefin exhibited excellent mechanical properties. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 816–828, 2000     

蚕丝蛋白粘胶长丝及其特性(1)

紧紧围绕清洁生产、环境保护、资源综合利用这一可持续发展的现代生产理念,以及舒适和功能化这一现代生活需求主题,利用蚕丝废丝、蚕丝下脚料以及从丝绸精练废液中回收的蚕丝蛋白,成功开发抗菌、高吸湿透气性的蚕丝蛋白粘胶长丝纺织新原料及环保安全的纺丝蛋白液制造技术,并实现连续式纺丝生产。已开发出多种规格的蚕丝蛋白粘胶长丝。     

Breathable polymeric materials based on high-density polyethylene prepared by environmental crazing

This work addresses the preparation of breathable materials based on high-density polyethylene (HDPE) and characterization of their performance. The sustainable HDPE mesoporous materials were prepared by the tensile drawing of the HDPE films in the presence of physically active liquids (PALEs) via the mechanism of environmental intercrystallite crazing (EIC). The prepared mesoporous materials were characterized by the different physicochemical methods such as differential scanning calorimetry (DSC), atomic force microscopy (AFM), low-temperature nitrogen adsorption (LTNA), and so forth. Water vapor transmission rate (WVTR) of the breathable materials can be tailored by varying the tensile strain upon the EIC and is found to be equal to 597–1345 g m⁻² day⁻¹. The breathable HDPE-based materials are characterized by good mechanical and insulating properties as well as by high water entry pressure (~43–47 bar). Hence, the deformation of HDPE films via the EIC mechanism provides an efficient route for the preparation of mesoporous breathable materials based on the low-cost commercial polymers, which can be used as waterproof, protective, subroof, gas storage, and packaging materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48567.     

Tri-Layered Bicomponent Microfilament Composite Fabric for Highly Efficient Cold Protection

Functional thin fabric with highly efficient cold protection properties are attracting the great attention of long-term dressing in a cold environment. Herein, a tri-layered bicomponent microfilament composite fabric comprised of a hydrophobic layer of PET/PA@C₆F₁₃ bicomponent microfilament webs, an adhesive layer of LPET/PET fibrous web, and a fluffy-soft layer of PET/Cellulous fibrous web is designed and also successfully been fabricated through a facile process of dipping, combined with thermal belt bonding. The prepared samples exhibit a large resistance to wetting of alcohol, a high hydrostatic pressure of 5530 Pa, and brilliant water slipping properties, owing to the presence of dense micropores ranging from 25.1 to 70.3 µm, as well as to the smooth surface with an arithmetic mean deviation of surface roughness (Sa) ranging from 5.112 to 4.369 µm. Besides, the prepared samples exhibited good water vapor permeability, and a tunable CLO value ranging from 0.569 to 0.920, in addition to the fact that it exhibited a very suitable working temperature range of −5 °C to 15 °C. Additionally, it also showed excellent clothing tailorability including high mechanical strength with a remarkably soft texture and lightweight foldability that suitable for cold outdoor clothing applications.     

Skin-Inspired Porous Mesh Bioelectronics with Built-In Multifunctionality for Concurrently Monitoring Heart Electrical and Mechanical Functions

Skin exhibits nonlinear mechanics, which is initially soft and stiffens rapidly as being stretched to prevent large deformation-induced injuries. Developing skin-interfaced bioelectronics with skin-inspired nonlinear mechanical behavior, together with multiple other desired features (breathable, antibacterial, and sticky), is desirable yet challenging. Herein, this study reports the design, fabrication, and biomedical application of porous mesh bioelectronics that can simultaneously achieve these features. On the one hand, porous serpentine meshes of polyimide (PI) are designed and fabricated under the guidance of theoretical simulations to provide skin-like nonlinear mechanics and high breathability. On the other hand, ultrasoft, sticky, and antibacterial polydimethylsiloxane (PDMS) is developed through epsilon polylysine (ε-PL) modifications, which currently lacks in the field. Here, ε-PL-modified PDMS is spray-coated on PI meshes to form the core–shell structures without blocking their pores to offer ultrasoft, sticky, and antibacterial skin interfaces. And rationally designed porous hybrid meshes can not only retain skin-like nonlinear mechanical properties but also enable the integration of both soft and hard bioelectronic components for various healthcare applications. As the exemplar example, this study integrates soft silver nanowires (AgNWs) based electrophysiological sensors and rigid commercial accelerometers on multifunctional porous meshes for concurrently monitoring heart electrical and mechanical functions to provide the comprehensive information of the evolving heart status.