Strain sensing behaviors of stretchable conductive polymer composites loaded with different dimensional conductive fillers
Strain sensing behaviors of stretchable conductive polymer composites loaded with different dimensional conductive fillers
复制标题
负载不同尺寸导电填料的可拉伸导电聚合物复合材料的应变传感行为
DOI：
10.1016/j.compscitech.2018.10.025
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发表时间：
2018-11-10
影响因子：
9.1
通讯作者：
Jiang, Wei
中科院分区：
文献类型：
--
作者：
Chen, Jianwen;Li, Hua;Jiang, Wei
在此，我们研究了异戊二烯橡胶（IR）基导电复合材料的应变传感行为的填料尺寸的依赖性。结果表明，炭黑/IR复合材料具有良好的应变敏感性和可恢复性，这是由于炭黑网络在拉伸时容易断裂，在释放时又能快速重建。但炭黑/IR复合材料的缺点是导电逾渗阈值高（8.01份），导致复合材料加工复杂、力学性能差、成本高。相比之下，碳纳米管（CNT）/IR复合材料具有低逾渗阈值（1.44 phr），但也具有低灵敏度和差的可恢复性，因为CNT网络在应变下更稳定。有趣的是，将一维碳纳米管和零维炭黑结合起来构建CNT-CB杂化网络是克服CB网络和CNT网络缺陷的有效途径，这使得可拉伸的CNTs/CB/IR复合材料具有低逾渗阈值、高应变灵敏度和良好的可恢复性。此外，演示实验表明，可拉伸的碳纳米管/炭黑/红外复合材料可以用于检测人体运动和情感表达。该研究加深了对负载不同尺寸导电填料的可拉伸导电聚合物复合材料的应变传感行为的了解，有助于设计应变传感材料。
Herein, we investigate the dependence of the strain sensing behaviors of isoprene rubber (IR) based conductive composites on filler dimensionality. It is found that carbon black (CB)/IR composites display ultrahigh strain sensitivity and good recoverability since CB-networks are easily broken under stretching and fast rebuilt under releasing. However, the drawback of CB/IR composites is the high electrical percolation threshold (8.01 phr), leading to the complex processing, poor mechanical properties, and high cost. In contrast, carbon nanotubes (CNTs)/IR composites possess low percolation threshold (1.44 phr) but also low sensitivity and poor recoverability because CNT-networks are more stable under strain. Interestingly, it is observed that combining zero dimensional CB and one-dimensional CNTs to construct the hybrid CNT-CB networks is an effective route to overcome the drawbacks of CB-networks and CNT-networks, which endows the stretchable CNTs/CB/IR composites with low percolation threshold, high strain sensitivity and good recoverability. Moreover, the demonstration experiments show that the stretchable CNTs/CB/IR composites could be used to detect human motions and emotional expressions. This study provides a deeper understanding of the strain sensing behaviors of the stretchable conductive polymer composites loaded with different dimensional conductive fillers, which helps to design strain sensing materials.