热塑性聚氨酯/碳纳米管湿纺导电纳米复合纤维的应变响应行为研究

Study on Strain Response Behaviors of TPU/CNTs Wet-Spun Conductive Nanocomposite Fibers

采用湿法纺丝工艺制备出了碳纳米管（CNTs,质量分数为10%）/热塑性聚氨酯（TPU）导电纳米复合纤维。该纤维具备良好的电导率（0.64 S/m）,高的强度（9.81 MPa）和高的断裂伸长率（487%）。纤维的电阻-应变响应范围为0~325%,其相对电阻（Δ_（R/R0））在该范围内分3个阶段呈指数增长。纤维的电阻-应变循环响应结果出现了肩峰和初始下降的现象,其灵敏度随应变的增大而增大,并且具备优异的耐久性。因此,TPU/CNTs导电纳米复合纤维在柔性应变传感器的应用方面具有很大的潜力。

Carbon nanotubes（CNTs, mass fraction 10%）/thermoplastic polyurethane（TPU） conductive nanocomposite fibers were prepared by wet spinning process. The fiber has good electrical conductivity（0.64 S/m）, high strength（9.81 MPa） and high elongation at break（487%）. The resistance strain response range of the fiber is 0-325%, and its relative resistance（Δ_（R/R0））increases exponentially in 3 stages. The results show that acromion and initial descent occurs in the fiber＇s resistance strain cyclic response. The sensitivity increases with the increase of strain and has excellent durability. Therefore, the TPU/CNTs conductive nanocomposite fiber has great potential in the application of flexible strain sensors.