导电橡胶在电磁屏蔽领域中的应用研究

从导电填料的角度分类介绍了国内外学者对导电橡胶在电磁屏蔽方面的相关研究，尤其对当前国外水平较高的研究进行了总结，并指出了导电填料的发展趋势。     

屏蔽电磁波干扰聚合物材料的研究进展

本文研究屏蔽电磁波干扰的方法及其屏蔽效果，着重讨论了导电涂料和导电塑料等屏蔽电磁波干扰聚合物材料的种类、特性、应用和发展。     

掺杂型电磁屏蔽导电涂料研究进展

电磁屏蔽导电涂料是应用广泛的防电磁辐射材料之一,本文概述了电磁屏蔽导电涂料的屏蔽原理及类型,分析了掺杂型电磁屏蔽导电涂料国内外研究现状以及存在的主要问题,对电磁屏蔽导电涂料的发展趋势及研究开发的重点进行了展望.     

电磁屏蔽涂料的发展现状及趋势

电子产品的日益普及使得电磁干扰成为一个突出问题,应用电磁屏蔽涂料是消除电磁干扰简单而有效的方法,本文介绍了电磁屏蔽涂料的组成、效能评价方法、技术思想、存在的问题以及发展趋势。复合型以及水性屏蔽涂料具有广阔的研发前景,高效能、宽频带、寿命长的电磁屏蔽涂料将会受到市场欢迎。     

纳米导电和电磁屏蔽涂料特性表征和评价方法

纳米导电和电磁屏蔽涂料特性表征方法为测定导电填料类型,包括金属系类型、碳系类型、金属氧化物类型以及复合物类型等;评价方法为测定漆膜的表面电阻、表面电阻率、体积电阻和体积电阻率或电磁屏蔽效能。文章对纳米涂料导电和电磁屏蔽特性的表征和评价方法进行探讨。     

抗电磁波PE-LD基复合薄膜性能研究

通过向低密度聚乙烯（PE—LD）中添加导电填料羰基多晶铁纤维（MCIF）和导电镍粉（Ni），制备了PE-LD／Ni／MCIF电磁屏蔽复合薄膜材料，研究了导电填料对复合薄膜材料电磁性能、导电性能和力学性能的影响。结果表明，该薄膜对较宽频段电磁波的屏蔽效能达到37-56dB（500-1500MHz），复合薄膜材料的“渗滤阈值”约为20％～25％；当导电填料（MCIF：Ni=1：1）的含量为18％（质量分数，下同）时，复合薄膜拉伸强度达到最大（12．5MPa），而其断裂伸长率却随着导电填料含量的增加总体呈下降趋势。     

A Unique Double Percolated Polymer Composite for Highly Efficient Electromagnetic Interference Shielding

This study has developed a carbon nanotube (CNT)/ethylene vinyl acetate (EVA)/ultrahigh molecular weight polyethylene (UHMWPE) composite with a unique double percolated conductive structure, in which only 20 wt% of CNT enriched EVA is needed to form a continuous conductive network. Compared with conventional double percolated conductive polymer composites (CPCs) which require filler‐enriched polymer content up to 50 wt%, the low CNT/EVA content gives rise to an unprecedentedly increased effective CNT concentration in the CNT/EVA/UHMWPE composite. The double percolated composite exhibits electrical conductivity comparable to that obtained in CNT‐loaded single EVA composite with five times of CNT content. Only 7.0 wt% CNT gives the composite an electromagnetic interference (EMI) shielding effectiveness of 57.4 dB, much higher than that of mostly reported CNT and graphene based CPCs. Absorption is demonstrated to be the primary shielding mechanism due to the numerous interfaces between UHMWPE domains and CNT/EVA layers facilitating multiple reflection, scattering, and absorption of the incident microwaves. The construction of unique double percolated structure in this work provides a promising strategy for developing cost‐effective and high‐performance CPCs for use as efficient EMI shielding materials.

     

电磁屏蔽材料及导电填料的研究进展

比较了电磁屏蔽涂料用各类填料的优缺点，较全面地介绍了铜系及镍系填料的性能改进研究进展及各种改进方法的机理；并介绍了结构型复合电磁屏蔽材料及填充型复合电磁屏蔽材料的制造方法及其优缺点。     

电磁屏蔽聚合物材料的研究进展

综述了近年来电磁屏蔽聚合物材料的国内外研究进展。对聚苯胺、聚吡咯等本征型电磁屏蔽聚合物材料的制备技术和电磁屏蔽性能进行了介绍；同时对金属、碳纤维和碳纳米管填充的复合型电磁屏蔽聚合物材料的类型、制备方法及电磁屏蔽性能进行了论述。     

导电电磁屏蔽塑料研究新进展

介绍了电磁屏蔽的基本理论,重点综述了3类主要的导电塑料即:表层导电型复合塑料、填充型复合塑料和本征导电高分子材料的研究应用现状,介绍了各类导电高分子电磁屏蔽材料的特点,并对其发展趋势做了展望。     

白色涤纶导电纤维的纺丝工艺

采用复合纺丝的方法,制备了纤维电阻≤109Ω/cm、截面为一字形与三点形、规格为22 dtex/3 f与55 dtex/6 f的白色涤纶导电纤维。对导电母粒、纤维截面、可纺性与纤维性能等方面进行了探讨。试验结果表明:较低熔融指数的导电母粒具有较好的可纺性能;不同截面形状的纤维表面光洁度不一样,会影响丝筒退绕张力;纺丝温度对纺丝组件的出丝情况与纤维截面的影响较为明显,进而影响可纺性能及纤维性能指标。最终,工业化试生产制备的纤维的可纺性及性能指标优良,具有较好的工业化前景。     

电磁屏蔽复合材料包装箱的研究

采用复合材料树脂传递模塑（RTM）工艺，利用一层含不锈钢纤维的导电布为屏蔽材料，制备了具有电磁屏蔽效能的玻璃纤维增强树脂基复合材料包装箱，该包装箱材料在1．0～4．0GHz电磁波范围内，电磁屏蔽效能最高可高达36dB左右，且与未含导电布的相同体系的复合材料相比，力学性能基本保持不变。     

不锈钢/涤纶混纺织物的电磁屏蔽效能

为了研究纱线中不锈钢纤维含量、嵌条排列比和织物组织结构对织物电磁屏蔽效能的影响,设计了正交试验,织造出相应的织物试样并测试电磁屏蔽效能。结果显示:不同组织结构的织物对不同频率的电磁波屏蔽效能存在差异,且同一织物的电磁屏蔽效能随着电磁波频率的增加呈现先增加后降低再增加的趋势;不锈钢/涤纶以混纺纱的方式,即不锈钢纤维较均匀地分布在织物中,织物具有较好的电磁屏蔽效能;排列比、不锈钢纤维含量、组织结构对织物防电磁屏蔽效能作用依次降低。     

电磁屏蔽填料的制备及研究进展

综述了电磁屏蔽导电复合填料的发展现状,分别介绍了金属系导电填料、碳系导电填料和金属-碳系导电填料的制备及研究进展。进一步分析了三种导电填料的优缺点,并对其进行了比较,同时对未来碳系填充型电磁屏蔽材料的发展趋势提出了建议。     

电磁屏蔽玻璃研究与发展现状

随着现代科技高速发展,各类通信设备与电子仪器所产生和面临的电磁污染与电磁干扰状况日益复杂,因而电磁屏蔽材料的研究受到了广泛关注。而在军事、航空航天、医疗、精密仪器等诸多领域同时存在着实现光学透明和电磁屏蔽功能的应用需求,因此研发兼具高透过率和高电磁屏蔽效能的电磁屏蔽玻璃具有重要意义。本文对近年来国内外关于电磁屏蔽玻璃的最新研究进展进行了综合评述,并从结构角度将电磁屏蔽玻璃分为膜层类结构、网栅类结构和复合结构三类,对各种结构及材料的优势与缺陷进行了总结和分析,最后对未来该领域的研究方向和发展前景进行了展望。     

电磁屏蔽导电涂料的市场现状及研究进展

介绍了电磁屏蔽导电涂料的国内研究进展以及市场现状。     

电磁屏蔽材料的发展现状及未来发展趋势

介绍了电磁屏蔽原理与导电聚合物复合材料（CPCs）特点,论述了不同应用场合下CPCs的物理特性（柔性、硬质、涂覆）,对近年来国内外电磁屏蔽材料中导电填料种类（金属、碳基、金属碳化物氮化物MXene）及其制备工艺进行了详细汇总分析,并对电磁屏蔽材料未来发展方向进行了展望。     

Review on Shielding Mechanism and Structural Design of Electromagnetic Interference Shielding Composites

Conductive polymer composites (CPCs) for electromagnetic interference shielding have received significant attention and shown rapid development. According to the electromagnetic wave interface conduction theory of Schelkunoff, excellent conductive performance and perfect conductive network structure are prerequisites for high shielding efficiency of electromagnetic interference shielding composites. Effective multiple interface reflection absorption, dielectric loss, and hysteresis loss characteristics of the materials are crucial for realizing the regulation of the electromagnetic interference shielding performance of CPCs. Therefore, the structural design of conductive and magnetic network for CPCs is crucial for achieving high shielding performance. In this study, it is established that an electromagnetic shielding composite with a uniform structure is widely used because of its simple preparation process, but its inefficient conductive network causes a high percolation threshold. The inefficiency can be solved by designing a composite structure and improving the efficiency of the conductive network. Currently, common structural designs include segregated structural, layered structural, and foam structural designs. These structural designs effectively solve the problem of high percolation threshold of CPCs and coordinate the contradiction between the performance of electromagnetic interference shielding and other advantages.     

Flexible and Highly Conductive AgNWs/PEDOT:PSS Functionalized Aramid Nonwoven Fabric for High-Performance Electromagnetic Interference Shielding and Joule Heating

High-performance multifunctional textiles are highly demanded for human health-related applications. In this work, a highly conductive nonwoven fabric is fabricated by coating silver nanowires (AgNWs)/poly(3,4-ethyl enedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) on a poly(m-phenylene isophthalamide) (PMIA) nonwoven fabric through a multistep dip coating process. The as-prepared PMIA/AgNWs/PEDOT:PSS composite nonwoven fabric shows an electrical resistance as low as 0.92 ± 0.06 Ω sq⁻¹ with good flexibility. The incorporation of the PEDOT:PSS coating layer improves the adhesion between AgNWs and PMIA nonwoven fabric, and also enhances the thermal stability of the composite nonwoven fabric. Electromagnetic interference (EMI) shielding and Joule heating performances of the PMIA/AgNWs/PEDOT:PSS composite nonwoven fabric are also investigated. The results show that the average EMI shielding effectiveness (SE) of the single-layer nonwoven fabric in X-band is as high as 56.6 dB and retains a satisfactory level of SE after being washed, bended, and treated with acid/alkali solution and various organic solvents. The composite nonwoven fabric also exhibits low voltage-driven Joule heating performance with reliable heating stability and repeatability. It can be envisaged that the multifunctional PMIA/AgNWs/PEDOT:PSS nonwoven fabric with reliable stability and chemical robustness can be used in EMI shielding devices and personal thermal management products.     

窗用电磁屏蔽波导玻璃

通过对电磁屏蔽玻璃屏蔽性能和截至波导理论的研究,制造了一种窗用电磁屏蔽波导玻璃。该玻璃是一种既能屏蔽电磁波,又能保持通风且具有防止信息泄露及情报泄密的绿色建材产品。