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聚合物基复合材料导热模型及热导率方程的研究 总被引:6,自引:0,他引:6
根据导热填料在聚合物基体中的分布,提出了导热聚合物基复合材料两相体系的“海岛-网络”模型;并结合逾渗理论及其在导电复合材料中的应用,建立了导热复合材料的逾渗热导率方程。实验证明,该模型及热导率方程符合实际而且适用于高含量填充型导热聚合物基复合材料热导率的预测。 相似文献
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氧化石墨烯作为石墨烯的重要衍生物,原料来源广泛,制备过程简单,成本低廉,具有优异力学性能、耐磨性能以及吸附性能等,其还原产物具有优良的导电性能和导热性能等,是聚合物基纳米复合材料的理想填料。近年来,随着复合材料制备方法的不断革新,聚合物基氧化石墨烯纳米复合材料得到了快速发展,并在储能、阻燃等领域实现了规模化应用,有助于引领聚合物基氧化石墨烯纳米复合材料相关产品的进一步开发和应用。本文系统介绍了氧化石墨烯的改性方法,综述了聚合物基氧化石墨烯纳米复合材料的研究进展,展望了聚合物基氧化石墨烯纳米复合材料的发展前景。 相似文献
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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。 相似文献
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热传导高分子复合材料的导热机理、类型及应用 总被引:11,自引:1,他引:11
主要介绍了聚合物基复合材料的导热机理以及预测二相体系复合材料热导率的理论模型Maxwell-Eucken,Bruggemen,Cheng-Vochen,Ziebland,Lewis-Nielsen,Y.Agari-Uno方程。同时介结了聚合物基导热材料的三种类型及其具体应用。提出聚合物基导热材料现阶段值得开发的课题和研究方向。 相似文献
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国外聚合物纳米复合材料 总被引:15,自引:0,他引:15
综述了世界聚合物纳米复合材料的特性,改性机理,应用,帛法和新动向,重点介绍了代表性的尼龙纳米复合材料性能及与一般尼龙,尼龙共混物的比较,功能性聚合物纳米复合材料,论述了帛备高性能聚合物系纳米复合材料关键,提高材料阻隔性,阻燃性的原理,并展望了聚合物纳米复合材料的前景。 相似文献
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Yujun Jia Tosin D. Ajayi Justin Morales Md Atiqur Rahman Chowdhury Godfrey Sauti Sang-Hyon Chu Cheol Park Chengying Xu 《Journal of the American Ceramic Society》2019,102(12):7584-7593
We report the thermal properties of boron nitride nanotube (BNNT) reinforced ceramic composites using the polymer derived ceramic (PDC) processing route. The nano-composites had a BNNT loading of up to 35.4 vol.%. TGA results showed that nano-composites have good thermal stability up to 900°C in air. BNNTs in nano-composites survived in an oxidizing environment up to 900°C, revealing that nano-composites can be used for high temperature applications. Thermal conductivity of PDC reinforced with 35.4 vol.% BNNT was measured as 4.123 W/(m·K) at room temperature, which is a 2100 % increase compared to that of pristine PDC. The thermal conductivity value increases with the increase of BNNT content. A thermal conductivity percolation phenomenon appeared when the BNNT content increased to 36 ± 5 vol.%. The results of this study showed that BNNTs could effectively improve the thermal conductivity of PDC materials. BNNT reinforced PDC could be used as thermal structural materials in a harsh environment at temperatures up to 900°C. 相似文献
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K. A. Dubey Y. K. Bhardwaj K. Rajkumar L. Panicker C. V. Chaudhari S. K. Chakraborty S. Sabharwal 《Journal of Polymer Research》2012,19(5):9876
Synergistic effect of MWNT induced reinforcement and high energy radiation induced crosslinking on the physico-mechanical
and thermal characteristics of polychloroprene rubber (PCR)/ethylene-propylene diene rubber (EPDM)/MWNT elastomeric nanocomposites
was investigated. The extent of reinforcement, as assessed using the Kraus equation suggested high reinforcement of the blend
on MWNT addition; though, the thermal stability and glass transition of the PCR and EPDM components were not significantly
affected by MWNTs. The elastic modulus increased with the radiation dose as well as with the increase in MWNT content. The
reinforcing mechanism of the nano-composites was studied by various micromechanics models all of which predicted higher moduli
than the experimentally observed results, indicating agglomeration in the nano-composites. Nevertheless, in all the composites
synergistic effect of radiation crosslinking and MWNT induced reinforcement were seen, suggesting radiation induced crosslinking
between polymer and MWNT interface. 相似文献
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碳纳米管(CNTs)由于优异的轴向导热性能,是目前制备高热导率聚合物基复合材料的一类重要填料。本文综述了近年来CNTs增强聚合物复合材料的研究进展,探讨了CNTs/聚合物复合材料的导热机理以及CNTs用量、尺寸及结构、表面改性、混杂CNTs粒子和聚合物基体结构等因素对CNTs/聚合物复合材料热导率的影响。同CNTs/聚合物的电导率相比,热导率远低于预期值,归因于CNTs/树脂界面间的声子频率失配现象导致了声子在界面的散射及很高的界面接触热阻,从而降低了体系热导率。分析和总结了改善体系热导率的方法和措施,采用特殊工艺使CNTs在基体内形成特殊的隔离结构或者取向结构是CNTs/聚合物导热复合材料的未来研究及发展方向。 相似文献
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Optically clear PSAs-TiO2 nano-composites were investigated for the purpose of display. TiO2 nano-particles can be directly incorporated into the polymer matrix to form high refractive index PSAs-nanocomposites films. Moreover, this study also employed semi-interpenetrated structured polymer network through the process of UV-curing with high refractive trifunctional acrylic monomer. The optical properties of PSAs-TiO2 nano-composites were examined by using UV-visible spectroscopy and a prism coupler. Viscoelastic properties were obtained by ARES and adhesion performance was measured by the peel strength, probe tack and shear adhesion failure temperature. Furthermore, curing behaviors of the PSAs-TiO2 nano-composites were investigated by using FTIR-ATR and gel content. 相似文献