柔性可穿戴氨纶/聚苯胺/聚氨酯复合材料的应变传感性能

为制备得到电导率高且稳定性好的应变传感器,采用原位聚合法制备了氨纶/聚苯胺复合导电纤维并分析了其结构与性能;以复合导电纤维和水溶性聚氨酯为原料,制备了氨纶/聚苯胺/聚氨酯复合材料,研究了其在不同拉伸状态下的应变传感性能。结果表明:氨纶纤维表面形成一层致密的聚苯胺导电层,其电导率达到0.626 S/cm;氨纶/聚苯胺复合导电纤维的往复拉伸可造成纤维表面聚苯胺导电层的破坏,影响其应变传感性能的重复性;聚氨酯的保护提高了氨纶/聚苯胺/聚氨酯复合材料应变传感性能的重复性,在100%应变条件下,经10次拉伸和拉伸-回复后,复合材料的电阻值与初始值的比值较氨纶/聚苯胺复合导电纤维分别下降约66.7%和50.0%。

Strain sensing property of flexible wearable spandex/polyaniline/polyurethane composites

In order to obtain high conductivity and stable strain sensing performance, conductive spandex/polyaniline composite fiber was prepared via in-situ polymerization followed by structure and properties analysis of the composite fiber. The spandex/polyaniline/polyurethane composite was prepared from composite conductive fiber and water-soluble polyurethane, and its strain sensing performance under different tensile conditions was studied. The results show that a dense layer of polyaniline is formed on the surface of spandex fiber, and its conductivity reaches 0.626 S/cm. The conductive polyaniline layer on the surface of spandex/polyaniline composite fiber is damaged by the reciprocating stretching, which affect the repeatability of the strain sensing performance. The protection of polyurethane improves the repeatability of the strain sensing property of the spandex/polyaniline/polyurethane composites. For example, under the condition of 100% strain, the ratio of resistance value and initial value of the composites after 10 times of stretching and stretching recovery decreases by about 66.7% and 50.0% compared with the conductive spandex/polyaniline composite fiber.