【摘要】 以热塑性聚氨酯（TPU）为弹性纤维基体，三氟乙酸银（C₂AgF₃O₂）为导电银纳米粒子（AgNPs）前驱体，水合肼为还原剂，采用湿法纺丝工艺、原位还原技术及热处理制备AgNPs/TPU导电纤维，研究了水合肼浓度、还原时间、C₂AgF₃O₂含量、热处理对纤维导电性能的影响，并对其微观形貌、化学组成、力学性能、拉伸电阻敏感性进行表征。结果表明：在C₂AgF₃O₂/TPU质量比为1.5：1.0,水合肼质量分数为15%,还原时间为20 min, 120℃热处理30 min的条件下得到的AgNPs/TPU导电纤维具有最佳的导电性能，电导率可达108.9 S/cm; AgNPs/TPU导电纤维微观上呈中空多孔结构，纤维表面被AgNPs均匀覆盖；AgNPs/TPU导电纤维的力学性能相比纯TPU纤维有所降低，断裂伸长率为484%,断裂强度为0.15 cN/dtex;该纤维可在0～70%的应变范围内表现出较为优异的拉伸电阻敏感性，在0～40%及40%～70%应变范围内，灵敏度系数分别为23.1及218.2,通过预拉伸再还原可进一步提高纤维的拉伸电阻响应灵敏度。更多还原

【Abstract】 Using thermoplastic polyurethane（TPU） as elastic fiber matrix, silver trifluoroacetate（C₂AgF₃O₂） as precursor of conductive silver nanoparticles（AgNPs）, hydrazine hydrate as reducing agent, AgNPs/TPU conductive fibers were prepared by wet spinning process, in-situ reduction technology and heat treatment. The effects of hydrazine hydrate concentration, reduction time, C₂AgF₃O₂ content and heat treatment on the conductivity of fibers were studied, and their micromorphology, chemical composition, mechanical properties, and tensile resistance sensitivity were characterized. The results showed that the AgNPs/TPU conductive fibers could be obtained with the optimal conductivity up to 108.9 S/cm, under the conditions of C₂AgF₃O₂/TPU mass ratio of 1.5：1.0, 15% hydrazine hydrate by mass fraction, reduction time 20 min and heat treatment for 30 min at 120 ℃; AgNPs/TPU conductive fiber exhibited a hollow porous structure at the micro level, and the fiber surface was uniformly covered by AgNPs; the mechanical properties of AgNPs/TPU conductive fiber were lower than those of pure TPU fiber, with an elongation at break of 484% and a breaking strength of 0.15 cN/dtex; the fiber exhibited excellent tensile resistance sensitivity within the strain range of 0-70%, with sensitivity coefficients of 23.1 and 218.2 in the strain ranges of 0-40% and 40%-70% respectively, and pre-stretching prior to reduction can further improve the tensile resistance response sensitivity of the fiber.更多还原