醇溶性EMI导电涂料配方的设计

将相平衡原理和相反应动力学原理应用于指导配方的设计。这使得EMI导电涂料的在制备过程中具有更合理的生产工艺和稳定的储存性能,并为导电涂料的漆膜提供更强的内聚力和更优秀的导电性能。通过比较导电涂料的树脂、导电填料、溶剂以及助剂的选择和应用对导电涂料的生产、施工以及漆膜物理性能的影响讨论导电涂料配方的设计技巧。     

聚吡咯／粘胶导电复合纤维的原位聚合法制备

用较简便的液相原位聚合法制备了聚吡咯／粘胶导电复合纤维、讨论了吡咯、氧化剂和介质酸浓度、反应温度和反应时间对纤维导电性能的影响，并采用气相色谱法研究了吡咯聚合反应动力学。结果表明，该导电复合纤维具有良好的导电性、力学性能和环境稳定性，扫描电（ＳＥＭ）结果表明聚吡咯均匀地复合在每单根纤维上。     

填充型导电高分子复合材料的逾渗理论进展

总结了粒子填充型导电体系逾渗网络的形成及逾渗理论概况，以热力学和动力学的观点对导电粒子种类、形状、浓度、分布和分散、基体树脂的种类、粒子与基体树脂的相互作用、加工条件等影响逾渗的重要因素作了系统的分析，阐明了体系的导电性、微观形貌、流变性能和物理性能的相互关系。对低逾渗值填充聚合物尤其是炭黑复合材料的成型与加工提供了理论指导。     

导电橡胶的制备研究

通过在乙烯－醋酸乙烯酯（EVA）共聚物、EPDM和EVA－EPDM（50：50）并用胶混入导电炭黑已制备出导电橡胶。研究了这些胶料的导电和物理性能。在填充炭黑的橡胶中，导电性的极限依赖于材料相容性和粘度以及橡胶的极性。电阻率随温度升高而减小，导电活化能随填充剂填充的增加而减小。电阻率与温度的依赖关系可能与由差动扫描量热法（DSC），X－射线散射（XRD）和动力学热分析（DMTA）测量的数据相关。在加热－冷却周期中，观察到电的流向（electrical set)和电的滞后。还报道了电阻率随施加的压力而变化。     

催化铁内电解法处理含铬废水

采用催化铁内电解法处理含铬废水,铜起强化内电解阴极能力的作用,具有较好的处理效果。同时考察了内电解过程中的各种影响因素及动力学特性,结果表明：降低初始pH值、增强溶液导电性能、提高反应温度,均可增大反应速率,提高处理效率。     

化学短纤维导电性能测试方法的探讨

介绍了现有的非导电、导电化学短纤维导电性能的测试方法,分析了现有方法的缺陷,提出了改进的思路——统一用比电阻值来表征导电、非导电化学纤维的导电性能,并设计了一种电桥法来测试化学短纤维的导电性能。     

结构型与复合型导电塑料研究进展

概述了导电塑料的重大发现,阐明了塑料的导电机理和导电渗滤阈值,分析了不同加工工艺、不同导电炭黑、不同聚合物体系对材料导电性能和力学性能的影响,介绍了纳米技术在导电聚合物中的应用,综述了国内外结构型与复合型导电塑料最新技术成果、应用领域和研究进展。     

聚合物基导电复合材料几种导电理论的评述

近年来,有关聚合物基导电复合材料的研究已受到普遍的重视,但对导电复合材料导电机理研究的不足制约了其应用和发展。导电复合材料的导电机理相当复杂,通常可分为导电通路如何形成和材料形成导电通路后如何导电这两个方面来研究。人们提出了许多导电机理模型,详细介绍了渗滤理论、有效介质理论、量子力学隧道效应理论等几种具有代表性的导电理论,对其适用范围、优缺点等进行了评述。通过对这些导电机理的探讨,有助于加深对复合型导电塑料以及其它导电复合材料导电行为的了解。     

纳米填料/橡胶体系在贮存中的结构形态变化Ⅱ.结构变化的影响因素及其对性能的影响

综述了纳米填料／橡胶复合体系在熔融态或高弹态贮存停放过程中,影响其结构形态变化的因素,以及贮存停放对复合体系流变性能、物理机械性能和导电性能的影响,并评述了相关的理论模型。纳米填料／橡胶复合体系在熔融贮存过程中的结构变化主要受橡胶的黏度、填料特性及其用量、填料与橡胶之间的相互作用以及加工性能的影响。填料网络结构的絮凝程度强化使复合体系流变性能、动态力学性能降低,但导电性能提高。相关的填料聚集动力学和填料絮凝模型大部分是唯象模型。     

石墨烯导电油墨的研究进展

石墨烯因具备着超高的电荷迁移率,近年来在导电油墨领域备受关注,它赋予了石墨烯导电油墨优异的导电性能、耐腐蚀性以及耐候性等优点。本文通过查阅文献的方式,简要介绍了导电相石墨烯的制备方法及导电油墨的导电机理,着重介绍了石墨烯导电油墨的制备工艺,其中包含氧化还原法、机械剥离法、液相剥离法等制备工艺。综述了石墨烯导电油墨在能源、电子器件、功能传感器方面的应用。提出了石墨烯导电油墨未来研究的关键性问题,如石墨烯导电油墨分散稳定性问题、配方环保问题、氧化石墨烯（GO）导电油墨的还原技术问题等。最后提出,石墨烯导电油墨应朝着低成本、绿色化、产业化的方向发展。     

镀银玻璃微珠/硅橡胶导电复合材料导电性能的影响因素

研究镀银玻璃微珠的用量、粒径、表面改性工艺以及导电硅橡胶硫化程度等对镀银玻璃微珠/硅橡胶复合材料导电性能的影响.结果表明,镀银玻璃微珠的粒径越大,复合材料的导电性能越好;湿法预处理和原位改性-分散工艺制得复合材料的导电性能和导电稳定性优于直接干混工艺;导电硅橡胶硫化程度的提高有利于提高材料的导电性能;Payne效应的大小与导电硅橡胶的体积电阻率有很强的相关性.     

导电胶的研究与发展

介绍了导电胶的组成与类别,从宏观和微观角度对几种导电机理进行了概述。从实验研究的角度,介绍了导电胶体积电阻率的测定方法和导电胶性能影响因素。分析了组成成分和固化工艺对导电胶性能的影响,如导电粒子的形貌和尺寸、树脂基体种类、固化温度、固化时间和湿热老化条件等对粘接性能和导电性的影响。指出了在固化过程中,树脂基体与导电粒子的匹配和润湿包覆作用对导电性能的重要影响。简单介绍了现今几种中温固化导电胶的性能,对研究方向作了展望。     

Processing and shape effects on silver paste electrically conductive adhesives (ECAs)

Various amounts of silver flakes and dendrites were used as conductive fillers in an electrically conductive adhesive (ECA) resin with DPM, BCA and xylene as diluent to help uniform distribution of filler particles in the matrix. Due to the fact that the higher the temperature, the higher the shrinkage rate of the polymer resin and, consequently, the larger the connecting area in-between fillers, a better curing condition for processing silver filled ECA was found to be a relatively higher curing temperature. The mechanism of conductivity achievement in conductive adhesives was analyzed by comparing processing conditions, resistivity and microstructures. In addition, the influence of adding nano-sized silver particles on the resistivity of the conductive adhesives was also investigated and the addition of nano-sized silver particles resulted in a lower percolation threshold for ECAs.     

Electrically Conductive Silicone/Organic Polymer Composites

Electrically conductive silicone elastomers carbon composites are the current state-of-art for electrically conductive elastomers. The combination of inorganic and organic polymers leads to a highly electrically conductive composite which has improved thermal stability. In this work, composites were formed, from two different classes of room temperature vulcanizing inorganic silicone polymers (vinyl & hydroxyl methyl silicone elastomers) (RTV-SI), which undergo curing by addition and condensation curing respectively, by a mixing and casting method. The organic polymer, which is the camphor sulfonic acid doped polyaniline (Pani.CSA) was synthesized by oxidative polymerization of aniline. By selecting RTV-SI system, the possibility of oxidative interaction of Pani.CSA that takes place at high temperature with curatives (peroxides) is ruled out. This helps to retain the conductivity of Pani.CSA and avoids the curing retardation of rubber. The concentration of Pani.CSA in the composites was varied from 20–40 phr. The electrical, thermal, morphological and short term stress - strain properties of the composites were studied after curing. A sharp decrease was observed in the resistance from ～10?15 Ω for blank silicone rubber to 27–31.5 KΩ for the filled composites with good thermal stability. The homogeneity of the composites was verified from SEM. The hardness of the composites was observed to increase by 3–5 on the Shore A scale. Tensile strength, tear strength and rebound resilience all decreased slightly.     

Study on the properties of conductive adhesives in various curing manners for MCM applications

In this work, the properties of solvent and solvent-free electrically conductive adhesives (ECAs) in four curing manners and after solder reflows are investigated for multi-chip module applications. The curing behaviors and thermal degradation of solvent and solvent-free ECAs are also studied by differential scanning calorimeter and thermogravimetric analysis, respectively. The bulk resistivity of ECAs in four curing manners is significantly different, even if they are cured at the same temperature and time. The conductive trends of solvent and solvent-free ECAs are also different. The good and poor conductive properties of solvent ECA are obtained at curing temperature starting from room temperature and setting temperature, respectively. However, the results of solvent-free ECA are opposite. All the bulk resistivity and the coefficients of thermal expansion of solvent and solvent-free ECAs tend to decrease after solder reflows. The reasons are studied by thermomechanical analyzer, thermogravimetric analysis, topography and deformation measurement, and scanning electron microscopy.     

Novel Fast-Curing Electrically Conductive Adhesives from a Functional Epoxy and Micro Silver Flakes: Preparation,Characterization, and Humid-Thermal Aging

In this study, novel fast-curing electrically conductive adhesives were prepared from a functional epoxy, a reactive diluent, a silane coupling agent, a curing agent, and micro silver flakes. Differential scanning calorimetry, Fourier transform infrared spectroscopy, four-probe method, shear test, impact test, scanning electron microscopy, and energy dispersive spectroscopy revealed the physical, electrical, mechanical, and thermal properties of these electrically conductive adhesives. They were cured at 120°C and 150°C for 15 min, and had low bulk resistivity, high shear strength, and low water absorption. They can be used in the electronic packaging and improve the related production efficiency greatly.     

Electric field-induced aligned multi-wall carbon nanotube networks in epoxy composites

CVD-grown multi-wall carbon nanotubes were dispersed as an electrically conductive filler in an epoxy system based on a bisphenol-A resin and an amine hardener. The application of both AC and DC electric fields during nanocomposite curing was used to induce the formation of aligned conductive nanotube networks between the electrodes. The network formation process and resulting network structure were evaluated by in situ optical microscopy and current density measurements as a function of curing time. Parameters such as field strength and nanotube weight fraction were varied. The carbon nanotube agglomeration mechanism was dominated by the electric field-induced forces acting on the nanotubes, which have a negative surface charge after processing in the epoxy. The network structure formed in AC fields was more uniform and more aligned compared to that in DC fields. The specific bulk composite conductivity of fully processed composite samples reflected the differences in the nanotube network structure. Perhaps surprisingly, the network efficiency was not enhanced by this processing method, although the approach does offer the possibility of achieving bulk conductive nanotube-polymer composites with anisotropic electrical properties and a degree of optical transparency.     

导电涂料的作用机理及应用

导电涂料的应用日益广泛,通过阐述导电涂料的作用机理,介绍了各种导电涂料的最新研究进展。     

Novel flexible electrically conductive adhesives from functional epoxy,flexibilizers, micro‐silver flakes and nano‐silver spheres for electronic packaging

In this study, five different flexibilizers were added into a matrix resin to improve the flexibility of electrically conductive adhesives (ECAs). The flexible ECAs were fabricated from the matrix resin and electrically conductive fillers. Their curing was fixed at 150 °C for 30 min. Of the five flexibilizers, 1,3‐propanediol bis(4‐aminobenzoate) (PBA) had the best effect on the electrical, mechanical and thermal properties of the ECAs. During curing, PBA reacted with the functional epoxy in the matrix resin. The soft ether segments in PBA were grafted into the crosslinked epoxy network to form an orderly spaced mesh structure. This led to high‐temperature stability, with the pyrolysis temperature being above 350 °C. Flexible ECAs with a 10% weight ratio of PBA in the matrix resin had the best properties. Their viscosity and bulk resistivity were the lowest. Their flexibility and electrical conductivity were the highest. They also had low storage modulus which could effectively dissipate or reduce the residual shear stress generated by the mismatch of thermal expansion coefficient between chip and substrate. Their impact strength was the lowest, and the toughening effect was so significant that the improvement was about 48% compared to ECAs. © 2013 Society of Chemical Industry     

Highly Hydrophobic Conductive Polyester Fabric Based on Homogeneous Coating Surface Treatment

A highly hydrophobic conductive polyester (PET-HE) fabric was prepared by a simple two-steps method. Firstly, homogeneous coating (the mixture of PET and carbon black (CB)) was uniformly coated on the PET fabric, which through curing in water coagulation bath and electrically conductive (PET-E) fabric was prepared. Then the solvent-induced crystallization process was adopted to PET-E fabric to endow the hydrophobic property. Investigations showed that PET-HE treated fabrics exhibited better hydrophobic and conductivity when the content of PET is 9wt% and the content of CB is the range of 8wt%-10wt%. The prepared polyester fabric proved to have such features as WCA was about 145°and surface resistance was about 300 Ω.GRAPHICAL ABSTRACT