Carbon nanotubes to enable autonomous and volumetric self-heating in epoxy/polycaprolactone blends
Carbon nanotubes to enable autonomous and volumetric self-heating in epoxy/polycaprolactone blends
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DOI：
10.1016/j.compscitech.2020.108321
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发表时间：
2020-10-20
影响因子：
9.1
通讯作者：
Prolongo, S. G.
中科院分区：
文献类型：
--
作者：
Jimenez-Suarez, A.;Martin-Gonzalez, J.;Prolongo, S. G.
将碳纳米管(CNT)添加到环氧树脂/聚己内酯(PCL)共混物中，得到导电共混物。正如预期的那样，碳纳米管含量的增加促进了更高的电导率，这是因为创建了更多的电路径。此外，还观察到随着PCL含量的增加，这种增强作用也被观察到，0.2wt%的碳纳米管和20wt%的PCL的样品达到了约0.2wt/m的S/m，这是因为它对混合物的流变性能产生了积极的影响，通过微观结构分析发现，这对碳纳米管的分散过程产生了积极的影响，从而导致了更均匀和分散更好的纳米复合材料。导热系数也随着碳纳米管含量的增加而增加，但由于其绝缘性能的原因，随着PCL的加入而降低。通过热像监测对每种材料达到上述自愈温度所需的电压进行了研究。已经观察到，碳纳米管和PCL含量最高的样品具有最好的电阻加热能力，这是因为电网的热阻效率更高，在低于150V的电压下达到100摄氏度以上的温度。
Carbon nanotubes (CNT) were added to epoxy/polycaprolactone (PCL) blends in order to get electrically conductive blends. As it was expected, an increase of CNT content promotes a higher electrical conductivity due to the creation of more electrical pathways. Furthermore, it was observed that the enhancement is also observed with increasing PCL content, reaching values of around 0.2 S/m for 0.2 wt % CNT and 20 wt % PCL samples, due to its effect on rheological properties of the mixture, which affect positively to the CNT dispersion process, thus leading to more homogeneous and well dispersed nanocomposites, as observed by microstructural analysis. Thermal conductivity also increases with CNT content but decreases with PCL addition due to its insulating properties. A study of the voltage required to reach the above-mentioned self-healing temperature for each material has been performed by thermography monitoring. It has been observed that the samples with the highest amount of both CNT and PCL, have the best resistive heating capabilities due to a higher thermoresistive efficiency of the electrical network, reaching temperatures above 100 degrees C, at voltages below 150 V.