DBSA掺杂聚苯胺在导电塑料中的应用

以十二烷基苯磺酸(DBSA)作为掺杂酸合成掺杂态聚苯胺,并以掺杂态聚苯胺和特导炭黑做为导电填料,线性低密度聚乙烯(LLDPE)为基体,乙烯-乙酸乙烯酯(EVA)作为增塑剂,掺杂态聚苯胺和特导炭黑作为导电填料,制备导电塑料。使用四探针法测定了掺杂态聚苯胺和导电塑料的电导率,使用扫描电子显微镜、X射线衍射、红外光谱法、热重法对掺杂态聚苯胺进行分析和表征,并且测试了导电塑料的力学性能和流动性能。研究表明:掺杂态聚苯胺具有良好的导电性能,可以作为导电塑料的导电填料使用;并且使用掺杂态聚苯胺和特导炭黑作为导电填料制备的导电塑料比单独使用掺杂态聚苯胺具有更好的导电性能,力学性能。     

三种导电填料与碳纳米管复合改性环氧树脂的研究

选取了炭黑、钛白粉和云母粉三种导电填料分别掺入10%的CNTs一同复合来改性环氧树脂的性能,结果表明,三种填料和CNTs复合后都可以显著提高复合材料抗静电的能力,而适量的炭黑复合碳纳米管和钛白粉复合碳纳米管混合物还可以起到改善环氧树脂复合材料力学性能的作用。研究表明通过多组分复合改性可以得到低成本高性能的环氧树脂材料。     

碳纳米管填料的静电自组装制备及在导电涂料中的应用

采用砂磨设备取代超声设备、阳/非离子表面活性剂复配分散碳纳米管,分散液与表面电负性的云母或二氧化钛复合,通过静电吸附作用自组装形成均匀稳定的复合物,制备出碳纳米管填料。探讨了碳纳米管填料在环氧涂料中的导电特性,对比了不同导电功能体涂料的防腐性能。提出碳纳米管导电填料在重防腐行业(如石油化工、煤炭工业)有广阔的应用前景。     

导电填料结构对氯化丁基橡胶基压电阻尼复合材料性能的影响

以氯化丁基橡胶(CIIR)作为基质材料、锆钛酸铅(PZT)为压电填料,分别以碳纳米管(CNTs)和导电炭黑(CB)作为导电填料,通过机械共混法制备了CNTs/PZT/CIIR和CB/PZT/CIIR两种压电阻尼复合材料。采用扫描电镜考察了导电填料在基质中的分散状况及其与基质的相容性,通过动态热机械分析和弹性体测试系统的测试探讨了导电填料的结构对复合材料压电阻尼性能的影响规律。结果表明,与CB相比,CNTs在基质中出现了严重的团聚,这导致其所制备复合材料的拉伸强度未达到预期效果。用量相同时,添加了CNTs复合材料的损耗因子峰值要小于填充CB者,但是其阻尼系数较大;随着导电填料用量的增加,两种复合材料的损耗因子峰值均呈下降趋势,而阻尼系数先略微减小然后增大。     

复合导电高分子材料的改性及应用研究进展

介绍了复合导电高分子材料的主要构成和分类,综述了碳系复合导电高分子材料[如炭黑(CB)填料型、碳纳米管(CNTs)填料型和石墨烯填料型等]、金属系复合导电高分子材料和金属氧化物系复合导电高分子材料的改性进展。最后对复合导电高分子材料的应用和发展前景进行了展望。     

碳系填充型导电塑料的研究进展

综述了碳系填充型导电塑料的优点、常用制备方法和炭黑、石墨、碳纤维、超导碳粉和碳纳米管等碳系填充型导电塑料的研究进展。高导电碳纤维和高性价比导电填料的开发、导电机理研究的加强及纳米导电填料的应用将是未来碳系填充型导电塑料的研究方向和开发重点。     

导电硅橡胶研究概况

简要介绍导电硅橡胶的导电机理、分类、电学特性以及提高硅橡胶导电性能的途径.导电硅橡胶分为金属粉末填充型和非金属粉末填充型,常用的导电填料有银粉、镰粉、镀银镍粉、石墨、炭黑、碳纳米管和导电纤维等.提高硅橡胶导电性能的途径主要有开发新型导电填料、对导电填料进行表面改性和优化加工工艺.     

碳纳米管/白炭黑/炭黑补强溶聚丁苯橡胶纳米复合材料导电性能的研究

研究碳纳米管(CNTs)/白炭黑/炭黑补强溶聚丁苯橡胶(SSBR)纳米复合材料的导电性能。结果表明,当白炭黑用量小于50份时,白炭黑的阻隔效应占主导,CNTs/白炭黑补强SSBR纳米复合材料的导电性能较差;当白炭黑用量达到70份时,白炭黑的体积排除效应占主导,复合材料的导电性能较好。炭黑和CNTs的协同作用可提高CNTs/白炭黑/炭黑补强SSBR纳米复合材料的导电性能。偶联剂Si747改性复合材料的导电性能优于未添加偶联剂Si747的复合材料。     

聚合物/碳纳米管复合导电材料的研究进展

基于碳纳米管(CNTs)的导电性能,对以碳纳米管为导电填料的复合导电材料的制备方法及国内外研究进展进行了综述。重点介绍了几种常见聚合物/CNTs复合导电材料的研究现状。展望了此类导电材料的发展前景。     

用碳纳米管制备导电性压敏胶粘剂

碳纳米管(CNTs)是一种导电材料,通过简单混合或超声波处理,可以在聚氨酯和丙烯酸酯溶剂型压敏胶粘剂及丙烯酸酯乳液型压敏胶粘剂中添加单层CNTs(SWCNTs)或多层CNTs(MWCNTs)。研究CNTs的分散性能与胶粘剂导电性能的关系。结果表明,MWCNTs的表面自由能对其分散性能和溶剂型压敏胶粘剂的导电性能有很大影响,乳液粒子直径对添加SWCNTs的乳液型压敏胶粘剂导电性能影响很大。     

Synergistic effects of hybrid carbon nanomaterials in room‐temperature‐vulcanized silicone rubber

This work examines nanocomposites based on nanofillers and room‐temperature‐vulcanized silicone rubber. The carbon nanofillers used were conductive carbon black (CB), carbon nanotubes (CNTs) and graphene (GE). Vulcanizates for CB, GE, CNTs as the only filler and hybrid fillers using CNTs, CB and GE were prepared by solution mixing. The elastic modulus for CNT hybrid with CB at 15 phr (4.65 MPa) was higher than for CB hybrid with GE (3.13 MPa) and CNTs/CB/GE as the only filler. Similarly, the resistance for CNT hybrid with CB at 10 phr (0.41 kΩ) was lower than for CB (0.84 kΩ) at 20 phr and CNTs as the only filler. These improvements result from efficient filler networking, a synergistic effect among the carbon nanomaterials, the high aspect ratio of CNTs and the improved filler dispersion in the rubber matrix. © 2016 Society of Chemical Industry     

PE-HD/CNTs/CB复合材料的导电行为研究

用溶液超声分散法制备了高密度聚乙烯/碳纳米管/炭黑(PE-HD/CNTs/cB)导电复合材料,研究了CNTs与CB的比例以及两者的总含量对复合材料导电行为的影响.结果表明,CNTs与CB以不同比例混合的试样其渗流阈值较PE-HD/CNTs高,比PE-HD/CB的低,CNTs与CB在材料内部可能形成了共同的导电网络;当其...     

Flexible free-standing carbon nanotube films for model lithium-ion batteries

A comparative study of conductive, free-standing, binder-free flexible films made from three different types of commercial carbon nanotubes (CNTs), i.e., single-wall, double-wall, and multi-wall was carried out. The conductive CNT films were prepared by adding the CNTs to the starting dispersion of carbon black and Triton X-100, followed by a vacuum filtration technique. These films have been characterized as model free-standing, binder-free electrodes for flexible lithium-ion batteries. Our experiments revealed that films based on multi-wall CNTs (MWCNTs) are much better than single-wall and double-wall CNTs films in terms of their electrochemical performance. The flexible MWCNT electrodes show stable cycling behavior and allow up to a 10 C-rate.     

碳纳米管改性填料对氟碳涂料性能的影响

采用混合酸和表面活性剂对碳纳米管表面进行改性处理,利用改性碳纳米管与不同的填料构造复合填料,并与FEVE氟碳树脂合成了碳纳米管改性复合氟碳材料,并将其涂覆在陶瓷基底上形成氟碳涂层。采用红外光谱（FTIR）对表面改性后的碳纳米管进行了表征分析,用扫描电镜（SEM）、接触角测量仪等仪器观察和测试了纳米复合氟碳涂层表面的微观结构及疏水性。研究结果表明：用混合酸和表面活性剂改性碳纳米管,碳纳米管的缠绕、团聚现象得到明显的改善,提高了其在氟碳树脂体系中的分散性能;当改性碳纳米管的量为0.75 g时,涂层的憎水性能较好。     

超声辐照制备聚醋酸乙烯酯/碳纳米管/炭黑导电复合材料

采用两步法制备了导电性聚醋酸乙烯酯/碳纳米管/炭黑复合材料。实验结果表明:超声辐照乳液聚合比常规搅拌能更有效地破坏CNTs的团聚和缠绕,实现其均匀分散。因而CNTs可作为"桥梁"连接导电炭黑,形成导电网络,增加复合材料中形成的导电通路数,增大载流子在导电粒子间的跃迁几率,提高聚醋酸乙烯酯/炭黑复合材料的导电率。当聚醋酸乙烯酯/炭黑复合材料中含有0.28%碳纳米管时,复合材料的电阻率从7.7×104Ω·cm降低到3.9×103Ω·cm,下降了19倍。     

Effects of the filler size on the electrical percolation threshold of carbon black–carbon nanotube–polymer composites

The Monte Carlo simulation of filled conductive polymer materials is a method of continuously generating a random conformation and averaging the interesting results to simulate the random dispersion of fillers in space. In our simulation, the irregular shapes of the filler were abstracted into regular ones. Carbon black (CB) aggregates were modeled as spheres, and carbon nanotubes (CNTs) were modeled as capped cylinders. The connection of the fillers was estimated via the calculation of the shortest distance between them; this determined whether a percolation pathway was formed or not. Numerical results were obtained, and these highlight the effects of the filler size, including the aspect ratio of CNTs and the ratio of the diameter of the CB aggregates to the diameter of the CNTs on the electrical percolation threshold (EPT). We found that the EPT decreased with increasing CNT aspect ratio and decreased the diameter ratio of the CB aggregates to CNTs. The simulation results were obtained by a simple pathway‐finder algorithm, which was proven to be effective compared with existing numerical, theoretical, and experimental simulations. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46517.     

Liquid‐sensing behaviors of carbon black/polypropylene and carbon nanotubes/polypropylene composites: A comparative study

Liquid‐sensing behaviors of carbon black (CB)/polypropylene (PP) and carbon nanotubes (CNTs)/PP‐conductive polymer composites (CPCs) were studied in detail. It was found that the CB/PP showed a higher liquid‐sensing intensity but a poorer reproducibility toward the “good solvent” xylene. The main origin is that the conductive works formed by CB, the zero‐dimensional filler, are vulnerable to the swelling effect of PP during the immersion‐drying runs (IDRs), whereas CNTs in the CNTs/PP with a large aspect ratio have better capacity in maintaining the conductive networks. To investigate the influence of the remaining solvent on the evolution of conductive networks, liquid‐sensing tests of the two composites after long‐term immersion in xylene were investigated. Results showed that the liquid‐sensing behaviors of CNTs/PP changed less weakly compared with that of the CB/PP. Liquid‐sensing behaviors of the two composites, cyclohexane and tetrachloromethane, to the “poor solvents” were also studied. The results of this article indicate that liquid‐sensing behaviors of the CPCs were affected by the microstructure of the conductive filler, the solubility parameter, and the molar volume of the solvent significantly. POLYM. COMPOS., 36:205–213, 2015. © 2014 Society of Plastics Engineers