纳米银颗粒-聚氨酯导电纤维的制备及拉伸传感应用

Preparation of AgNPs-polyurethane conductive fiber and its application in tension sensing

摘要:

为了提高导电纤维的可拉伸性，采用湿法纺丝法制备聚氨酯纤维(TPU纤维)，将TPU纤维浸渍三氟乙酸银溶液并还原制备纤维状纳米银颗粒/聚氨酯导电纤维(AgNPs-TPU导电纤维)。探究了不同制备条件下AgNPs-TPU导电纤维的导电性和拉伸性，研究了AgNPs-TPU导电纤维拉伸传感性能。结果表明，以质量分数25%的TPU纺丝液所制备的TPU纤维浸渍20 mg/mL三氟乙酸银溶液还原4次后，AgNPs-TPU导电纤维单位长度电阻为10.79Ω，抗拉伸强度为5.14 MPa，断裂伸长率为576.18%。在不同拉伸应变的情况下，AgNPs-TPU导电纤维可通过自身电阻变化率的变化对不同的拉伸应变信息进行表征，实现将拉伸应变信号稳定转化为电信号，具备良好的拉伸传感性能。

Abstract:

In order to improve the stretchability of conductive fibers, a wet spinning method is used to prepare polyurethane fibers (TPU fibers). The fibrous nano-silver-polyurethane conductive fiber (AgNPs-TPU conductive fiber) is prepared by immersing in a silver trifluoroacetate solution and reducing it.Explore the effects of different preparation conditions on the conductivity and stretchability of AgNPs-TPU conductive fibers, and study the tensile sensing properties of AgNPs-TPU conductive fibers. The results showed that the quality score of the selected TPU concentration is 25%, the concentration of the immersed silver trifluoroacetate solution was 20mg/mL, and the immersion reduction is 4 times. The resistance of AgNPs-TPU conductive fiber is 10.79Ω.The tensile strength is 5.14MPa.The elongation at break is 576.18%, and it has good electrical conductivity and mechanical properties. In the case of different tensile strains, AgNPs-TPU conductive fiber can characterize different tensile strain information through the change of the resistance rate value. AgNPs-TPU conductive fiber can realize the stable conversion of the tensile strain signal into an electrical signal and has good tensile sensing performance.