Comparative study of the thermoresistive behavior of carbon nanotube-based nanocomposites and multiscale hybrid composites
Comparative study of the thermoresistive behavior of carbon nanotube-based nanocomposites and multiscale hybrid composites
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DOI：
10.1016/j.compositesb.2021.109068
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发表时间：
2021-06
影响因子：
13.1
通讯作者：
H. Dai;E. Thostenson;T. Schumacher
中科院分区：
文献类型：
--
作者：
H. Dai;E. Thostenson;T. Schumacher
碳纳米管（CNT）基复合材料在过去十年中的进展表明，由于其独特的电学性质，它们具有广泛的潜力，可用作多功能传感器。本文采用原位电阻测量方法研究了两组分（CNT-环氧树脂）纳米复合材料和分级（CNT-纤维-环氧树脂）多尺度复合材料在25 ~ 145 °C热循环过程中的热阻行为。通过三辊研磨、浸涂和电泳沉积方法制备了一系列具有可控纳米管形貌的碳纳米管基复合材料。结果表明，碳纳米管基复合材料的耐热性能受到碳纳米管浓度、热膨胀、纤维/聚合物性质和界面相互作用的影响。碳纳米管-环氧树脂纳米复合材料与随机分散的碳纳米管显示出正的温度相关性。相比之下，与纤维的多尺度复合材料显示出双交叉形的温度依赖性，其电阻的影响的碳纳米管网络的变化，所引起的聚合物的热运动和残余热应力。复合材料的热膨胀行为的特点是使用热机械分析仪和一个简化的有限元模型被用来定性地检查纤维-基体界面的残余应力。虽然纳米复合材料的热阻行为已被更广泛地研究，这项研究是了解多尺度CNT/纤维复合材料的加工-结构-热阻响应关系的第一步。
Advances in carbon nanotube (CNT) based composites over the past decade have demonstrated broad potential of utilizing them as multifunctional sensors because of their unique electrical properties. This article studies the thermoresistive behavior of two-component (CNT-epoxy) nanocomposites and hierarchical (CNT-fiber-epoxy) multiscale composites usingin situelectrical resistance measurements during thermal cycling from 25 to 145 °C. A series of CNT-based composites with controlled nanotube morphologies were created via three-roll-milling, dip-coating and electrophoretic deposition methods. The results show that the thermoresistive behavior of CNT-based composites is influenced by the CNT concentration, thermal expansion, fiber/polymer properties, and interfacial interactions. CNT-epoxy nanocomposites with randomly dispersed CNTs show a positive temperature correlation. In comparison, multiscale composites with fibers show a double-crossover-shaped temperature dependence of their electrical resistance influenced by the changes of the CNT network that are induced by the polymer thermal motions and the residual thermal stresses. The thermal expansion behavior of the composites was characterized using a thermomechanical analyzer and a simplified finite element model was used to qualitatively examine the fiber-matrix interfacial residual stresses. While the thermoresistive behavior of nanocomposites has been investigated more broadly, this research is a first step in understanding the processing-structure-thermoresistive response relationship of multiscale CNT/fiber composites.