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综述了以聚合物为基体的碳纳米管复合材料导热模型,分析了复合材料热传导体系中碳纳米管(CNTs)填料的作用机制,归纳了混合规则导热模型、均质模型、有效介质模型、非均质模型和随机分散模型等,并总结了导热模型常用的数值计算方法。这些模型丰富了导热理论,可以对复合材料导热系数进行初步预测,但在数值上都存在近似或者简化处理,对碳纳米管/聚合物复合材料预测广谱性较差。未来需要对分子尺寸和界面热阻等影响导热系数的关键因素深入探究,改善数值和表征分析方法,以期为碳纳米管/聚合物复合材料的导热性能的研究和设计提供参考,为其他复合材料导热性能的研究提供借鉴。 相似文献
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采用不同品种、粒径的导热填料和基体树脂,以熔融共混方法制备聚合物/填料体系导热功能复合材料。研究了复合材料热导率λ和体积电阻率ρv随不同填料、粒径等因素的变化规律及其内在原因。不同填充体系的热导率均随填料粒径的减小而降低,而电导率则相反;复合体系热导率随填料含量的增加始终呈逐步上升趋势,未表现出电导率那样的急剧变化。研究表明:复合体系热导率和电导率变化的差异主要是由于二者具有不同的传导机理;复合材料热导率的变化规律可以用热弹性复合增强机制进行合理解释。 相似文献
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孔娇月;陈立新;蔡聿峰 《中国塑料》2011,25(3):7-12
在介绍金属材料、无机非金属材料以及高分子材料导热机理的基础上,介绍了导热填料填充高分子复合材料的导热网链机理和热弹性组合机理2种导热机理,该理论可以解释导热高分子复合材料导热过程中不同的现象和规律;归纳了适用于粒子、纤维等填充的聚合物基复合材料的各种导热模型;讨论了树脂基体、导热填料和温度对于高分子复合材料热导率的影响... 相似文献
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Composites of low density polyethylene, LDPE, and polyacetylene, (CH)x, were prepared by polymerization of acetylene in LDPE films impregnated with a Ziegler-Natta catalyst. LDPE films were immersed in a toluene solution of this catalyst at 70°C to accomplish impregnation. Polymerization of acetylene in the LDPE films was carried out at 100°–110°C. The resulting composite films remain flexible and tough upon prolonged air exposure and those containing <ca. 5 wt.% (CH)x soften upon heating to 120°–160°C. The films can be rendered conductive upon exposure to a 2 wt%. solution of l2 in pentane. Ultimate conductivities of ca. 10Ω?1cm?1 can be obtained. The conductivities of the doped composites decay more slowly as compared with l2-doped (CH)x films. The synthetic approach, with some simple modifications, can be used in the construction of many electrically conductive, all-polymer composites having a combination of desirable physical, mechanical and electrical properties. 相似文献
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Matthew L. Clingerman Julia A. King Kirk H. Schulz Jeffrey D. Meyers 《应用聚合物科学杂志》2002,83(6):1341-1356
The electrical conductivity of polymeric materials can be increased by the addition of carbon fillers, such as carbon fibers and graphite. The resulting composites could be used in applications such as interference shielding and electrostatic dissipation. Electrical conductivity models are often proposed to predict the conductivity behavior of these materials in order to achieve more efficient material design that could reduce costly experimental work. The electrical conductivity of carbon‐filled polymers was studied by adding four single fillers to nylon 6,6 and polycarbonate in increasing concentrations. The fillers used in this project include chopped and milled forms of polyacrylonitrile (PAN) carbon fiber, ThermocarbTM Specialty Graphite, and Ni‐coated PAN carbon fiber. Material was extruded and injection‐molded into test specimens, and then the electrical conductivity was measured. Data analysis included a comparison of the results to existing conductivity models. The results show that the model proposed by Mamunya, which takes into account the filler aspect ratio and the surface energy of the filler and polymer, most closely matched the conductivity data. This information will then be used in the development of improved conductivity models. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1341–1356, 2002 相似文献
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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。 相似文献
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