碳系填料在聚合物基导电复合材料中的应用

介绍碳系填料在聚合物基导电复合材料中的应用以及导电复合材料渗流阈值的影响因素。碳系填料主要包括炭黑、石墨、碳纤维和碳纳米管等,对各类碳系填料的研究应侧重于提高其本征导电性能,并解决填料在聚合物基体中的分散问题。开发复合填料是拓宽碳系填料在电磁屏蔽领域应用的有效途径。采用混合填料、复合填料和多种聚合物材料并用可显著降低复合材料的电阻率,提高电磁屏蔽性能,降低导电渗流阈值。     

防静电涂料中导电填料的应用

讨论了在防静电涂料中金属系填料、碳系填料、金属氧化物填料、复合填料4类导电填料的特性、应用及开发状况。     

硅橡胶导电网络的研究进展

导电硅橡胶作为导电高分子材料的一个重要分支,其不仅保留了硅橡胶独特的易加工、高回弹性、高耐候性等特性,还可以通过加入导电材料使其自身获得所需的导电性能。本文介绍了导电硅橡胶的分类、导电机理以及导电网络的制备工艺和填料(金属系填料、碳系填料)构筑体系,综述了硅橡胶导电网络构筑的研究进展。     

碳系导电填料的导电橡胶研究进展

阐述导电橡胶的导电机理(主要为导电通路、隧道效应和电场发射理论),介绍炭黑、碳纤维、碳纳米管、石墨和石墨烯等碳系导电填料在导电橡胶中的应用研究进展。各类碳系导电填料单用或并用的导电橡胶可用于制备抗静电材料、电磁屏蔽材料、吸波材料、高压电缆、光电子器件和分子导线等。     

碳系电磁屏蔽涂料研究现状及应用前景

主要介绍了我国电磁屏蔽涂料的分类、相关行业标准以及对电磁屏蔽涂料的性能要求。归纳总结近年来有关不同碳系导电材料在电磁屏蔽涂料领域的研究进展,重点阐述不同结构碳系导电材料以及与其他导电材料进行复合等形式对提高涂层电磁波屏蔽性能的影响。     

铜系电磁屏蔽涂料的研究

阐述了电磁屏蔽涂料的电磁屏蔽原理和导电机理;讨论了导电填料的填充量、形状、粒度和填充型导电涂料导电性能的关系;分析了偶联剂、镀覆金属、漆膜厚度及固化条件对导电涂料的导电性能的影响;提出了铜系导电涂料尚需解决的主要问题。     

聚合物/碳系填料发泡复合材料电磁屏蔽性能的研究进展

综述了聚合物/碳系填料发泡复合材料在电磁屏蔽领域应用的研究进展,重点讨论了各种碳系填料（石墨烯、碳纳米管、碳纤维）以及多组分碳系填料对发泡复合材料电磁屏蔽性能的影响及相关电磁屏蔽原理。结果表明,碳系填料的功能化、泡孔结构的调控、材料多层次结构的设计、制备工艺的优化等是改善聚合物/碳系填料发泡复合材料电磁屏蔽性能的有效途径。     

碳系导电油墨填料的研究进展

导电油墨起源于导电涂料,印刷电子行业的兴起产生了对导电油墨的研发需求。本文综述了碳系导电油墨填料的研究现状、导电机理、应用前景及其发展方向。首先概述了传统碳系导电油墨填料(石墨、炭黑、碳纤维及其混合物)以及新型碳系导电油墨填料(碳纳米管、石墨烯)的研究进展,重点分析了传统碳系填料的研究方向及手段,解释了新型碳系填料应用于导电油墨的优越性。然后从宏观和微观层面概述了当前主流的几种导电机理的基本原理和适用范围,并指出了目前对油墨导电性能的研究只能定性分析而不能定量描述的局限性。最后,重点介绍了两种新型碳系导电油墨填料的最新研究进展和应用方向,特别指出了当前对碳纳米管和石墨烯填料的研究亟需解决的问题,总结了二者今后的研究重点和研究趋势。     

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。     

碳系填充型聚合物屏蔽材料最新进展

针对目前碳系材料作为屏蔽基元材料存在的不足,结合电磁屏蔽机理,介绍了炭黑、石墨、碳纤维、碳纳米管等碳系屏蔽复合材料的最新研究情况。为克服碳系填料无磁性这一不足,最近几年碳系材料在包覆金属纳米层,磁控溅射镀镍等方面有了长足的发展,使得碳系填充型屏蔽材料的应用越来越广。此外介绍了纳米纸、石墨烯等新型碳系材料的发展趋势。最后指出了碳系屏蔽复合材料向着多功能、宽频带、高吸收等方向的发展趋势。     

On the ‘curiosity’ of electrical self‐heating,static charge and electromagnetic shielding effectiveness from carbon black/aluminium flakes reinforced epoxy‐resin composites

This paper shows the wide application range (such as electrical self‐heating and electromagnetic shielding effectiveness) of composites consisting of conductive carbon black/aluminum flakes (CBA) filler and epoxy insulative matrix. The effect of CBA content on the network structure of epoxy matrix was investigated in detail. Static electrical conductivity increases linearly with the increase of filler concentration at the interface in epoxy composites. The large decrease of the conductivity as a function of the temperature is analyzed in terms of the negative temperature coefficient of conductivity (NTCC) effect. The influence of viscosity, surface energy and barrier highest energy on the NTCC behaviour in the composite is also considered. Based on these results, a new interpretation is proposed to explain the NTCC phenomena by computing the swelling force among conductive phases. The correlations of conductivity during the temperature cycling and activation energy were analyzed. The effects of dynamic ageing at various temperatures on the resistivity are reported. Current–voltage–temperature characteristics for epoxy with different contents of CBA were examined in detail. A model based on the law of energy conservation is proposed to calculate the specific heat and amount of heat dissipation. The static charge of the epoxy–CBA composites was estimated. The correlation between electromagnetic wave‐shielding effectiveness (EMS), conductivity and frequency of epoxy composites with different filler contents is also discussed. Furthermore, the effect of annealing on EMS of epoxy composites was examined. © 2002 Society of Chemical Industry     

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。     

电热混凝土复合材料的研究进展

综合国内外文献及作者的最新研究成果,从单掺和复掺导电组分两个方面介绍了目前电热混凝土复合材料的研究进展,侧重于介绍电热混凝土的导电性、导电相掺量、电热性能和初步现场试验结果.     

Preparation of lightweight and high-strength polypropylene-based ternary conductive polymer foams by in situ microfiber reinforcement

Conductive polymer composites (CPCs) have demonstrated significant potential in the aerospace, electronics, and communications industries. In this study, polypropylene (PP)/multiwalled carbon nanotubes (MWCNTs) binary composites and in situ fiber reinforced multicomposites made from PP/MWCNTs were fabricated by microcellular injection molding. In addition to crystallization behavior, foam morphology, mechanical properties, dielectric properties, and electromagnetic shielding properties of the composites were analyzed. According to the results, microporous structures can facilitate the distribution of conductive fillers, thereby enhancing the electromagnetic shielding performance and mechanical properties of the composite. In situ microfiber networks display a heterogeneous nucleation effect, resulting in an increase in foam density, which improves composite performance. In situ fiber-reinforced microporous multicomposites are capable of exhibiting higher elongation at break and electromagnetic shielding properties than binary systems, and the multicomposites can achieve greater electromagnetic shielding effectiveness (SE) with fewer conductive fillers. Ultimately, fiber-reinforced microporous composites with an elongation at break of 194.40%, an electromagnetic shielding effect of >20 dB, and an absorption mechanism are produced. A feasible method is presented in this study for preparing CPCs that produce light weight, excellent mechanical properties, and high electromagnetic SE at low filler levels.     

碳纳米管材料在电磁屏蔽涂料中的应用

介绍了碳纳米管材料作为导电填料在电磁屏蔽涂料中的应用,并论述了碳纳米管的特性以及作为导电填料所进行的纯度、分散、偶联处理等分析,阐述了碳纳米管作为导电填料的电磁屏蔽涂料的发展趋势。     

纳米导电炭黑防静电PTFE涂层的研究

以纳米导电炭黑粉体XC-72R作为导电填料对高分子材料进行防静电处理。先对纳米导电炭黑粉体进行球磨分散,制得固含量为35wt%的高稳定性导电浆料,再将该浆料添加到聚四氟乙烯(PTFE)乳液中,并涂布到玻璃纤维布上,经380℃烧结制得防静电PTFE涂层。当炭黑粉体的添加量为3.98wt%时,涂层的电阻率可达106Ω.cm,具有很好的防静电效果。     

新型防静电软塑包装复合材料研究及应用

通过探索导电炭黑填充量对薄膜导电性能的影响,优选了油炉法炭黑。将油炉法炭黑和聚乙烯(PE)树脂混炼造粒,制得半导电粒子,采用三层共挤吹膜工艺和电晕处理技术,制得高表面能防静电PE薄膜;将该薄膜与其它基材复合成物理力学性能优异的防静电软塑包装复合材料。该复合材料被广泛应用于对静电及电磁辐射敏感的电子、化工及军工产品的包装,起到良好的防静电、抗电磁干扰等防护作用。     

Microcellular Conductive Carbon Black or Graphene/PVDF Composite Foam with 3D Conductive Channel: A Promising Lightweight,Heat-Insulating,and EMI-Shielding Material

In this study, a lightweight microcellular carbon-based filler/poly(vinylidene fluoride) (PVDF) composite foam is fabricated with a 3D conductive network that is thermally insulating, electrically conductive, and fabricated on a large scale. This composite can be used for high-efficiency thermal insulation and electromagnetic interference (EMI) shielding applications. The prepared composite demonstrates low density, high electrical conductivity, and excellent thermal insulation properties. The structure and density of the conductive network and the carbon-based filler content has a significant influence on the electrical conductivity of the prepared composite foam. Although the composite comprises microcellular PVDF beads of the same density, the conductivity of the composite-comprising strip beads is greater than that comprising spherical beads. In the same conductive network structure, as the size of the microcellular PVDF beads decrease, the conductive network becomes denser, which results in a higher conductivity. Furthermore, with an increase in the conductive filler content, the conductivity improves significantly. Excellent EMI shielding materials with optimal filler content and particle shapes, exhibiting EMI shielding effectiveness of up to 40–50 dB, are developed. The prepared composite foam possesses excellent application potential in the fields of ultra-light thermal insulation, conductivity, and EMI shielding.