Washable Multilayer Triboelectric Air Filter for Efficient Particulate Matter PM2.5 Removal

Efficient removal of particulate matter (PM) is the major goal for various air cleaning technologies due to its huge impact on human health. Here, a washable high‐efficiency triboelectric air filter (TAF) that can be used multiple times is presented. The TAF consists of five layers of the polytetrafluoroethylene (PTFE) and nylon fabrics. Compared with traditional electrostatic precipitator, which requires a high‐voltage power supply, the TAF can be charged by simply rubbing the PTFE and nylon fabrics against each other. The electrical properties of the TAF are evaluated through the periodic contacting–separating of the PTFE and nylon fabrics using a linear motor, and an open‐circuit voltage of 190 V is achieved. After charging, the TAF has a removal efficiency of 84.7% for PM_0.5, 96.0% for PM_2.5, which are 3.22 and 1.39 times as large as the uncharged one. Most importantly, after washing several times, the removal efficiency of the TAF maintains almost the same, while the commercial face mask drops to 70% of its original efficiency. Furthermore, the removal efficiency of the PM_2.5 is very stable under high relative humidity. Therefore, the TAF is promising for fabricating a reusable and high‐efficiency face mask.     

Ionic‐Association‐Assisted Viscoelastic Nylon Electrolytes Enable Synchronously Coupled Interface for Solid Batteries

Electrolyte/electrode heterointerfaces activated by unhindered charge transfer play an important role in solid‐state and flexible batteries. However, continuous electrochemical cycling and mechanical deformations cause structural dislocation and unwanted reactions. An important challenge is to ensure enduring accurate contact between the battery components. The customization of a highly viscoelastic polyamide (PA, nylon)‐based solid electrolyte to address this key issue is presented. The approach involves the use of concentrated aqueous solutions of bis(trifluoromethane)sulfonimide lithium (LiTFSI) to structurally “unzip” and relink pristine hydrogen‐bonded PA chains by bridged cation–anion association. This elaborately tailored crosslinking technique confers upon the resultant electrolyte a combination of the preferred mechanical characteristics including high viscoelasticity and reversible stretchability, together with outstanding electrochemical performance represented by high ion conductivity (2.7 × 10^?4 S cm^?1) and high anodic stability (>3 V vs Zn/Zn²⁺). Flexible batteries with a well‐integrated configuration in which synchronous electrolyte/electrode movement guarantees intimate and compatible interfaces even during extreme deformations and electrochemical stimulations, are further demonstrated. These results reveal a promising opportunity to overcome the bottleneck caused by interfacial defects for next‐generation solid batteries by reconstituting the structure of classical polymers and developing functional electrolytes.     

原位聚合法制备尼龙66/蒙脱土纳米复合材料及其性能

采用原位聚合法制备了尼龙66/有机蒙脱土纳米复合材料,利用TEM观察了复合材料的微观结构,测试了其力学性能、热稳定性和阻燃性能,探讨了复合材料结构与性能之间的关系。研究结果表明:蒙脱土以纳米尺度均匀分散在尼龙66基体中,蒙脱土的加入改善了材料的力学性能、热稳定性和阻燃性能。     

原位聚合法制备尼龙6复合材料的研究进展

综述了近年来国内外尼龙6原位复合材料的研究进展.基于改性剂的不同,将其分为无机纳米粒子/尼龙6原位复合材料、有机高分子聚合物/尼龙6原位复合材料和碳纳米管/尼龙6原位复合材料.重点介绍了这三类复合材料的力学性能和耐热性能.     

大分子界面改性剂对PA6/水镁石力学性能的影响

通过力学性能测试及扫描电子显微镜分析,探讨了自制的大分子界面改性剂对PA6／水镁石力学性能的影响,并与偶联剂TC-114进行了对比。结果表明,加入大分子界面改性剂与偶联剂TC-114相比,可以明显提高PA6／水镁石的力学性能,特别是断裂伸长率和冲击强度提高较大。     

载重子午线轮胎锦纶胎圈包布挂胶配方的改进

介绍载重子午线轮胎锦纶胎圈包布挂胶配方的改进过程。小配合、大配合和生产使用试验结果表明，试验配方胶料的强仲和撕裂性能较生产配方好，解决了压延帘布渗胶差、挺性大及工艺粘性差等问题，同时可改善轮胎使用中早期胎圈脱空和胎圈开裂等问题。     

锦纶包布对全钢载重子午线轮胎胎圈性能的影响

采用有限元分析方法研究全钢载重子午线轮胎胎圈部位采用锦纶包布层以及锦纶包布帘线与胎体帘线成不同角度情况下的胎圈性能。结果表明。当锦纶包布帘线与胎体帘线的夹角较小时，胎体反包端点上单元和右单元的综合应变和综合应力较小，胎体反包端点的剪应变和应变能密度也较小；夹角增大及无锦纶包布时，综合应变、综合应力、剪应变和应变能密度增大，说明采用锦纶包布、减小锦纶包布帘线与胎体帘线的夹角有利于提高胎圈性能。     

汽车起动机齿轮拨叉失效分析

分析了引起汽车起动机齿轮拨叉收缩变形及强度低所引起的制品失效原因,采用定型棒对制品进行定型以补偿拨叉的收缩变形;通过改进浇口位置来调整玻璃纤维在制品中的取向,使拨叉受力方向与玻璃纤维取向平行,从而消除了制品因强度低所引起的失效。     

六氟丙烯等离子体处理对锦纶和涤纶织物表面性能的影响

以六氟丙烯为气氛对锦纶和涤纶织物进行等离子体处理,处理后织物表面的水接触角有一定的提高,利用X射线光电子能谱(XPS)分析等离子体处理前后的元素组成及官能团变化.等离子体处理后在不同织物表面引入的氟元素含量不同,Cls分峰表明在织物表面引入的-CF、-CF2和-CF3基团相对含量也有所不同,说明不同纤维等离子体处理后含氟基团在织物表面的结合方式有所区别.     

尼龙斜交载重轮胎早期损坏原因及解决方法探讨

针对尼龙余交载重轮胎使用过程中出现的早期损坏，分析了其使用因素和设计因素，从配方设计、结构设计等方面提出了相应的解决方法。同时认为加强工艺控制与结构、配方设计对轮胎性能的影响同等重要。