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首页> 外文期刊>Journal of Materials Engineering and Performance >Electrical and Thermal Properties of Twin-Screw Extruded Multiwalled Carbon Nanotube/Epoxy Composites
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Electrical and Thermal Properties of Twin-Screw Extruded Multiwalled Carbon Nanotube/Epoxy Composites

机译：双螺杆挤压多壁碳纳米管/环氧树脂复合材料的电学和热学性质

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This paper presents the experimental results of dispersing multiwalled carbon nanotubes (MWNTs) into epoxy (space grade structural adhesive) nanocomposites using co-rotating twin screw extrusion process. Two sets of specimens were prepared; set 1 with ultrasonication for predispersing MWNT before extrusion and set 2 direct dispersion of MWNT in the extruder. MWNT was loaded up to 8 vol.% in both the sets. The specimens were characterized for room temperature volume and surface resistivities as per ASTM D257 using Keithley Model 6517 and for thermal conductivity in the temperature range −50 to 150 °C as per ASTM E 1530 using Thermal Conductivity Instrument (TCI) 2022 SX211. The volume resistivity of sets 1 and 2 decreased to an extent of 1011 and 109 respectively. The surface resistivity drop was of the order of 109 for both the sets. These drops corresponded to the maximum MWNT loading of 8 vol.%. Electrical conductivity values of the specimens were fitted into the Power Law Model to evaluate the critical exponent. Both sets 1 and 2 showed increase in thermal conductivity with increase in temperature in the testing range. Thermal conductivity increased with increase in filler loading and the maximum increase was 60% at 150 °C in case of 8 vol.% MWNT nanocomposites for set 1. The corresponding value for the set 2 was 25%. Thermal conductivity values were predicted using Lewis Nielson model. DSC of the specimens showed increase in glass transition temperature with increase in filler loading. The dispersion of the nanofillers was studied using SEM and the surface morphology using AFM.
机译：本文介绍了使用同向旋转双螺杆挤出工艺将多壁碳纳米管（MWNT）分散到环氧（空间级结构粘合剂）纳米复合材料中的实验结果。制备了两组标本。第一组带有超声处理，用于在挤出前预分散MWNT，第二组直接将MWNT分散在挤出机中。两组中MWNT的装载量最高为8体积％。使用Keithley型号6517根据ASTM D257对样品的室温体积和表面电阻率进行表征，并使用热导率仪器（TCI）2022 SX211根据ASTM E 1530对样品在−50至150°C的温度范围内进行表征。第一组和第二组的体积电阻率分别降低到10 11 和10 9 。两组的表面电阻率降幅均为10 9 。这些下降对应于8体积％的最大MWNT负载。将样品的电导率值拟合到幂律模型中，以评估临界指数。在测试范围内，组1和2均显示出随着温度的升高导热系数的增加。组1的MWNT纳米复合材料为8％（体积）时，热导率随填料含量的增加而增加，在150°C时最大增加为60％。组2的对应值为25％。使用Lewis Nielson模型预测热导率值。样品的DSC显示玻璃化转变温度随填料负载的增加而增加。使用SEM研究了纳米填料的分散性，并且使用AFM研究了纳米填料的表面形态。

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