碳纤维面状发热材料的性能研究

本文研究了碳纤维面状发热材料在热压过程中的电性能变化以及在通电使用过程中电阻变化规律,结果表明：热压过程中,压力,温度及绝缘树脂的固化等对碳纤维面状发热体的电阻性能会产生影响,具有“压实搭接”的特性,压力对电阻起很重要的作用,其次是树脂的熔融固化过程,压制过程中导电纸电阻呈下降趋势,随通电时间的增加,碳纤维面状发热体的电阻趋于稳态化,具有恒功率的特征。碳纤维面状发热板具有远红外辐射特性,其波长在８     

LLDPE／EVUA／CB复合体系的导电和发热性能

对ＬＬＤＰＥ／ＥＶＡ（乙烯醋酸乙烯酯共聚物）／ＣＢ（碳黑）三元复合材料的导电性能及发热特性进行了研究。讨论了碳黑种类及含量对复合导电材料性能的影响，探讨了复合材料的伏－安特性、功率－温度特性以及辐照交联工艺对复合材料稳定性的影响。结果表明，添加乙炔碳黑，可使复合材料具有最佳的导电性及ＰＴＣ（正电阻温度系数）特性，辐照交联使材料具有良好的电阻稳定性，由此制得的电缆经过一年的通电试验，其工作温度稳定在     

高分子PTC材料及其器件电阻稳定性研究概况

综述了高分子基ＰＴＣ（正温系数）导电材料及其器件开发中最关键的技术－电阻稳定性的研究现状及 进展,分析了影响电阻稳定性和重要性的因素,提出了辐照交联等方法,并从原理上作了简单介绍。     

模具固化成型法弹性电极的制作

为了解决用于机器人触觉感知的柔弹性电极导电稳定性差、柔弹性不够、易被磨损破坏等问题,基于银纳米线及聚二甲基硅氧烷采用模具固化成型方法设计制作了长条形弹性电极,并进行了拉伸试验。结果表明:拉伸后的电阻增量为电阻初始值的380%,且多次拉伸后,电阻波动值都很小,这种弹性电极保持了良好的导电性和导电稳定性,可以应用于拉伸、弯曲、扭转等多种复杂的应用场合。     

可穿戴体育设备导电复合材料的制备与性能分析

为提升可穿戴体育设备导电材料的导电稳定性,采用ABS（丙烯酸-丁二烯-苯乙烯嵌段共聚）对石墨烯材料实施改性处理。首先,以金属镍泡沫为基体制备石墨烯泡沫,并对金属镍-石墨烯体系实施横向压缩处理,提升石墨烯泡沫的整体密度。在此基础上,于横向压缩石墨烯泡沫表面涂抹ABS溶液,使其具有良好的抗弯曲性能,最终获得横向压缩石墨烯泡沫/ABS复合材料,进而对其进行导电性能测试。经实验研究发现,该材料在弯曲状态下的电阻稳定性显著优于未经横向压缩处理的石墨烯泡沫/ABS复合材料,并且在100次循环弯曲过程中仍然保持较低的电阻变化率水平,体现出了较为理想的导电稳定性。将该材料应用于可穿戴体育设备,有助于提升设备使用运行稳定性和延长使用寿命,具有一定的应用价值。     

石墨/聚乙烯导电复合材料PTC效应稳定性的研究

研究了制备方法、硅烷交联、热处理对石墨/聚乙烯复合材料的热循环稳定性的影响,讨论了改善正温度系数(PTC)导电高分子材料稳定性的原因.研究发现,用溶液混合法制备的复合材料具有良好的热循环稳定性;用硅烷偶联剂交联得到的复合材料,负温度系数(NTC)效应得到了有效抑制;热处理也可以有效改善材料的PTC效应的稳定性,经过热处理,材料的室温电阻率、PTC强度变化比较小.     

超声辐射对PVA/CB导电复合材料气敏性能的影响

以聚乙烯醇(PVA)为基体,填充各种类型炭黑导电粒子,制备了导电复合薄膜。研究了超声作用下导电复合薄膜在不同溶剂蒸气中的气敏性能。考察了PVA与炭黑的比例、炭黑种类、超声时间、超声功率等条件对导电薄膜响应性能与响应稳定性的影响,并对这种导电复合薄膜产生气敏响应性的机理作了分析。结果表明,以PVA/乙炔炭黑组成的导电复合薄膜具有较强气敏响应性。当将其置于丙酮、正丁醇、乙醇、水极性溶剂中,电阻急剧提高102~103倍,表现为正蒸气系数效应(PVC);随炭黑含量提高,复合材料薄膜室温电阻下降,对溶剂蒸气的响应强度提高;超声时间、功率对导电粒子分散行为及复合材料的气敏性有影响,随超声时间延长及功率增大,接枝改性效果明显,导电薄膜的响应性及重复稳定性提高。     

PE／炭黑导电复合体系正（电阻）温度系数

较系统地研究了以ＬＤＰＥ,ＨＤＰＥ,ＬＬＤＰＥ等为基体,在各自临界组成区域掺混一同类型的炭黑对复合物正（电阻）温度系数（ＰＴＣ）负（电阻）温度系数导电特性的影响。结果发现,不同类型的ＰＥ及炭黑种类的ＰＴＣ特性曲线具有不同特征,通过对导电填料进行表面处理及对ＰＥ进行接技改性可以提高导电复合物的热电稳定性。     

导电胶的研究进展

介绍了导电胶的导电机理,分析了提高导电胶导电性能、接触电阻稳定性以及力学性能的途径.     

碲化镉薄膜电池组件在高寒高海拔地区适应性研究

导电胶带在发电玻璃中起着传输电流的作用,选择合适的导电胶带对降低碲化镉薄膜电池组件在高寒高海拔地区失效的风险有着至关重要的影响.本文首先使用1#、2#、3#厂家的导电胶带制备成3种碲化镉薄膜电池组件试样,然后对比3种发电玻璃试样在85℃下加热1000h后导电胶带与碲化镉电池背电极间的接触电阻,并对3种碲化镉薄膜电池组件试样进行湿热、热循环及电致发光测试.测试显示试样1中,3种导电胶带与碲化镉电池背电极的接触电阻值中2#最小,其值是1.8552Ω.试样2中2#导电胶带制备成的4片发电玻璃,其中2片经过湿热测试后功率衰减分别为2.89％、3.88％,另外2片发电玻璃经过热循环测试后,功率衰减分别为4.56％、4.93％.结果 表明导电胶带与背电极的接触性能受温度、湿度的影响较大.     

导电天然橡胶在工频电流电路中的特性

以乙炔炭黑和高导电炭黑填充天然橡胶，研究在工频电流电路中的特性。结果表明：填充高导电炭黑的天然橡胶的导电性能明显优于填充乙炔炭黑的天然橡胶，高导电炭黑的适宜填充量为３０份；导电天然橡胶交流电阻低于直流电阻；导致导电天然橡胶热迅速破坏的耗散功率为２０－３０Ｗ，高导电炭黑天然橡胶正常使用的耗散功率不宜超过４Ｗ。     

Room-Temperature Conducting LaNiO3 Thick-Film Coatings Prepared by Aerosol Deposition

Metallic conductive LaNiO₃ thick films with a thickness of 0.5–10 μm were fabricated by a room-temperature-operating powder deposition process—aerosol deposition method. The coated LaNiO₃ layers were fairly dense without pores or cracks, and maintained their phase stability due to low-temperature consolidation. The as-deposited LaNiO₃ film consisted of ∼10-nm-diameter grains, with a sheet resistance of 10–100 Ω/□, while the post-annealed LaNiO₃ film had a sheet resistance of 4.45 Ω/□, which is the lowest value ever reported for an LaNiO₃ film. This excellent conductivity result was attributed to the high crystal stability and dense microstructure.     

PEDOT:PSS coating on specialty papers: Process optimization and effects of surface properties on electrical performances

In this study, the effects of different paper substrates on the electrical resistance of conducting polymer films are reported. A novel method of bar coating is used for the fabrication of organic conductive films on various substrates. Solutions to improve the continuity of conductive thin film in order to enhance the electrical properties are demonstrated. In order to compare the capability of these different substrates for a potential use in the organic electronic field, sheet resistance measurements were made. It is emphasized that substrate roughness and surface energy are two fundamental parameters, due to their significant impact on sheet resistance. Two methods to overcome bad paper surface properties are proposed. The first consists in the superimposition of conductive polymer layers and the second in the use of a protective layer.     

High performance of carbon nanotubes/silver nanowires-PET hybrid flexible transparent conductive films via facile pressing-transfer technique

To obtain low sheet resistance, high optical transmittance, small open spaces in conductive networks, and enhanced adhesion of flexible transparent conductive films, a carbon nanotube (CNT)/silver nanowire (AgNW)-PET hybrid film was fabricated by mechanical pressing-transfer process at room temperature. The morphology and structure were characterized by scanning electron microscope (SEM) and atomic force microscope (AFM), the optical transmittance and sheet resistance were tested by ultraviolet-visible spectroscopy (UV-vis) spectrophotometer and four-point probe technique, and the adhesion was also measured by 3M sticky tape. The results indicate that in this hybrid nanostructure, AgNWs form the main conductive networks and CNTs as assistant conductive networks are filled in the open spaces of AgNWs networks. The sheet resistance of the hybrid films can reach approximately 20.9 to 53.9 Ω/□ with the optical transmittance of approximately 84% to 91%. The second mechanical pressing step can greatly reduce the surface roughness of the hybrid film and enhance the adhesion force between CNTs, AgNWs, and PET substrate. This process is hopeful for large-scale production of high-end flexible transparent conductive films.     

Self-standing conductive ITO-silica nanofiber mats for use in flexible electronics and their application in dye-sensitized solar cells

For the realization of flexible electronics, we proposed a nonwoven mat of inorganic electrospun nanofibers (NFs) of amorphous silica that is flexible and heat-resistive as a candidate to replace a glass or plastic substrate. We attempted to add electrical conductivity using indium tin oxide (ITO) to create self-standing, nonwoven flexible mats completely composed of inorganic ceramic materials. Two methods were tested to make the ITO-silica NF mats: electrospun silica-NF mats drop coated by ITO and hybrid mats composed of ITO NFs and silica NFs fabricated by the dual-spinneret electrospinning technique. Our produced ITO-silica NF mats exhibited both mechanical flexibility and thermal stability, even after heat treatment at 450–650 °C. The sheet resistance was 15–113 Ω/sq. We attempted to apply the obtained nonwoven conductive mats to the flexible photoanode of dye-sensitized solar cells (DSSCs) and highlighted the problems in the existing application.     

钢纤维石墨复相导电混凝土的研究

探讨了导电混凝土在养护龄期28d内电阻的变化,分析了交流电和万用电表测试电阻的差别,研究了电阻随交流电压变化而变化的情况.比较了石墨导电混凝土和石墨、钢纤维复相导电混凝土28d抗压强度上的差别,同时分析了钢纤维对导电混凝土强度的影响;对比了石墨、钢纤维复相导电混凝土块在不同交流电压下的升温效果以及导电混凝土电阻随温度的变化.     

Silver nanowire-based transparent,flexible, and conductive thin film

The fabrication of transparent, conductive, and uniform silver nanowire films using the scalable rod-coating technique is described in this study. Properties of the transparent conductive thin films are investigated, as well as the approaches to improve the performance of transparent silver nanowire electrodes. It is found that silver nanowires are oxidized during the coating process. Incubation in hydrogen chloride (HCl) vapor can eliminate oxidized surface, and consequently, reduce largely the resistivity of silver nanowire thin films. After HCl treatment, 175 Ω/sq and approximately 75% transmittance are achieved. The sheet resistivity drops remarkably with the rise of the film thickness or with the decrease of transparency. The thin film electrodes also demonstrated excellent flexible stability, showing < 2% resistance change after over 100 bending cycles.     

Ag mesh network framework based nano composite for transparent conductive functional electrodes for capacitive touch sensor and thin film heater

We report on the development of a highly conductive, transparent and flexible Ag mesh-like network covered by an ITO/PEDOT:PSS nanocomposite for flexible conductive electronics. The electrode was deposited completely via solution-based deposition. A lower R_s value, from 7.21 Ω/□ to 5.05 Ω/□, was achieved by annealing the substrate via low-temperature plasma annealing. The low-temperature annealing was used to achieve crystallinity of the materials without deformation and degradation of PEDOT:PSS and the PET substrate. The low-cost deposition-based Ag NW-ITO/PEDOT:PSS electrode substantially decreased sheet resistance and provides the transmittance of 85.17%. The chemical stability and mechanical stability of the product were examined, and morphological studies were performed; in all of these, the substrate exhibited excellent behavior. Finally, a transparent flexible electrical heater and capacitive touch screen panel were fabricated using the Ag NW-ITO/PEDOT:PSS electrode to demonstrate the performance of the electrode and its potential applications.     

预测聚合物基复合材料导热系数方法综述

由聚合物与高导热填料共混制得的导热聚合物基复合材料,被应用于防腐和节能要求较高的换热场合,符合换热设备新材料的要求;而聚合物基复合材料的等效导热系数预测比较复杂。总结了预测聚合物基复合材料等效导热系数的多种方法,包括最小热阻力法、热阻网络法、傅里叶定律法、均匀化方法和逾渗理论方法,归纳了这些模型和方法的特点,对应用这些模型和方法提出了建议。     

影响水泥窑余热发电量的因素

对已投运水泥窑余热电站发电量的统计表明,煤质和生料配料比均影响发电量的大小。按照煤燃烧相关理论,在生产条件不变或相同的前提下,生产系统的余热资源和所用煤种没有关系。通过深入分析,发现煤质和生料配比影响的是生产线的热耗,而热耗才是影响余热发电出力的关键因素。热耗与吨熟料发电量正相关,热耗增加会导致余热电站发电量上升。