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不同炭黑对聚丙烯/炭黑复合材料导电性能的影响 总被引:1,自引:0,他引:1
研究了四种不同的导电炭黑与聚丙烯复合制得的复合材料的体积电阻率与炭黑含量的关系,确定了复合体系中炭黑的渗滤阈值。用扫描电镜(SEM)观察了不同炭黑含量的复合材料的断面形貌,用透射电镜(TEM)观察分析了四种炭黑的结构及粒径,并对其比表面积进行了测定。结果表明:炭黑不同,得到的复合材料的渗滤阈值有很大差别。炭黑结构性越高,比表面积越大,粒径越小,其导电性能越好,得到的渗滤阈值越低。特别是具有空壳结构的炭黑,其渗滤阈值明显低于其他三种炭黑。 相似文献
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以炭黑为导电填料,在聚丙烯中加入适量的环氧树脂和玻璃纤维,制备了新型的抗静电和导电聚丙烯复合材料。测定了不同复合体系的渗滤阈值,用扫描电镜(SEM)对相形貌进行了观察,并研究了环氧树脂和玻璃纤维用量对体积电阻率的影响。SEM照片表明在新型复合材料中,炭黑优先分布在环氧树脂中,环氧树脂包覆在玻璃纤维表面,通过玻璃纤维间的搭接形成导电通路。这种独特的结构使该复合材料的渗滤阈值低于聚丙烯/炭黑和聚丙烯/环氧树脂/炭黑复合体系的渗滤阈值。玻璃纤维和环氧树脂含量分别需要达到约10%,复合材料才能具有抗静电和导电作用。 相似文献
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LDPE/石墨导电复合材料的研究 总被引:3,自引:0,他引:3
为了制备具有低渗滤阈值的导电复合材料,通过溶液插层法,选用三种不同的导电填料(石墨,膨胀石墨,膨化石墨),引入马来酸酐接枝聚乙烯。制备低密度聚乙烯/石墨导电复合材料,导电填料的结构对复合材料的电性能和力学性能有很大的影响,其中膨化石墨可使复合体系具有较低的导电渗滤阈值,但复合材料的力学性能较差。 相似文献
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LDPE/炭黑/多晶铁纤维/镍粉导电材料的性能 总被引:2,自引:0,他引:2
以多晶铁纤维、镍粉和炭黑作为导电填料填充LDPE,制备了一种导电复合材料。分析了多晶铁纤维和镍粉的加入对导电复合材料导电性、屏蔽效能和拉伸强度的影响。结果表明,随着多晶铁纤维和镍粉含量的增加,复合材料的拉伸强度呈下降趋势,导电性提高,当导电填料的含量达到渗滤阈值20%后,复合材料的表面电阻率从10^10Ω降低到10Ω;当炭黑、多晶铁纤维和镍粉的质量分数均为10%时.材料的屏蔽效能在10-30dB,优于LDPE/炭黑材料。 相似文献
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结构型与复合型导电塑料研究进展 总被引:6,自引:1,他引:6
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。 相似文献
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导电硅橡胶导电性和电热性的研究 总被引:11,自引:1,他引:11
对乙炔炭黑作导电填料的导电硅橡胶的导电性和电热性进行了研究。结果表明,由乙炔炭黑用量和渗滤阈可以预测和控制导电硅橡胶的体积电阻率;导电硅橡胶的电阻-温度变化规律符合隧道效应理论模型,导电硅橡胶的电压-电流特性呈非线性欧姆性,且乙炔炭黑用量越大,电压-电流特性的非线性欧姆性越显著;发热量与热损耗量达到平衡时,导电硅橡胶的表面温度可维持140℃,导电硅橡胶可作面状发热体使用;在满足导电性能的前提下,为保证导电硅橡胶良好的物理性能,应控制乙炔炭黑用量。 相似文献
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导电云母粉的制法及其应用 总被引:19,自引:2,他引:17
导电涂料和塑料用导电云母粉具有比重小、导电性好、有光泽、颜色可调、原料丰富、价格低等特点,优于其他导电填料,用于防止产生静电和屏蔽电磁波。介绍了化学镀和化学共沉淀两种方法制备导电云母粉。举例说明导电云母粉的应用。 相似文献
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介绍了导热室温硫化硅橡胶的导热机理及导热模型,分析了室温硫化硅橡胶的导热性能及综合性能,并概述了国内外导热室温硫化硅橡胶的研究现状。指出通过填充不同粒径分布的填料或对填料进行适当的表面处理,可以制备高导热室温硫化硅橡胶。 相似文献
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This work is concerned with the preparation and characterization of composite materials prepared by compression molding of a mixture of aluminum flakes and nylon 6 powder. The electrical conductivity, density, hardness and morphology of composites were investigated. The electrical conductivity of the composites is < 10−11 S/cm unless the metal content reached the percolation threshold, beyond which the conductivity increased markedly by as much as 1011. The volume fraction of conductive filler at the percolation threshold was calculated from experimental data, by fits to functions predicted by the percolation theory. Decreasing the average particle diameter of filler leads to increased percolation threshold (it varies from 23 to 34 vol% for the three different fillers studied) and decreased maximal conductivity of composites. The density of the composites was measured and compared with values calculated assuming different void levels within the samples. Furthermore, it is shown that for certain sizes of particle filler, the hardness decreases initially with the increase of metal concentration, possibly because of poor surface contact with the nylon matrix, but, starting from a certain value, there is a hardness increase. For the smallest particle filler, the hardness of samples is not influenced by the presence of the filler. 相似文献
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Qingyan Shang Weili Wang Dongsheng Fu Tianlong Ma 《Journal of Adhesion Science and Technology》2013,27(24):2642-2652
The antistatic coatings were prepared by using rare earths modified BaTiO3 powders as conductive fillers instead of the traditional metal additives. The composition and preparation technology of the antistatic coatings were researched. The effects of thinner, curing agent, dispersant, and conductive fillers on surface resistance and performances of the antistatic coatings were studied. The determined composition of the antistatic coatings was that of epoxy resin 10.00?g with curing agent 13%, BaTiO3 powders 5%, dispersant 2%, and thinner 4?ml?g?1. FTIR and SEM analyses illustrated that the dispersant agent and ultrasonic can make modified BaTiO3 powders in the coatings to disperse completely. The parameters of antistatic coatings were as following: surface resistance is 1.18?×?1010?Ω, dry time is 6.0?h, solid content is 94.0%, stiffness is 0.419, viscosity is 255?s, adhesive force is 3, and flexibility is 2. The antistatic coatings were prepared by using rare earths modified BaTiO3 powders will be prospective candidates for reducing static electricity. 相似文献