嵌入机织物的碳纳米管纱线应变传感性能

Strain sensing of carbon nanotube yarn embedded into woven fabric

为研究以碳纳米管(CNT)为传感元件的智能织物的传感性能,采用嵌入方式将碳纳米管纱线与机织物结合,测试碳纳米管纱线的电阻变化率与机织物的应变关系。结果表明:实验所用的CNT纱线的传感系数为1.02,采用5%的聚乙烯醇(PVA)溶液对其进行复合后的CNT/PVA纱线其传感系数提高到了1.43;将CNT纱线与CNT/PVA纱线分别沿经向和纬向嵌入平纹织物,均沿经向施加3%的应变,CNT/PVA纱线传感系数经向为0.67,纬向为0.27,CNT纱线传感系数经向为0.33,纬向为0.1。改变CNT/PVA纱线嵌入平纹的经浮长,浮长越长时织物的传感系数越高,连续6个经浮长对应的传感系数最高为0.81;改变CNT/PVA纱线经向嵌入平纹的长度,在一定范围内,嵌入的纱线长度越长织物的传感系数越高,将3 cm的CNT/PVA纱线经向嵌入平纹织物经向拉伸7%时对应的传感系数约为1.07。

In order to study the strain sensing of the smart fabric with carbon nanotube（CNT） as the sensing element,CNT yarn was embedded into woven fabric and the relationship between the resistance changing rate of CNT yarn and the strain of fabric was tested.The results show that the gage factor of the original CNT yarn is 1.02,the gage factor of the composite yarn treated by 5% polyvinyl alcohol（PVA）is increased to 1.43.Embedding the CNT yarn and CNT/PVA yarn into woven fabric in warp and weft direction and appling 3% strain along the warp direction,and the gage factor of CNT/PVA yarn is 0.67 in warp direction and 0.27 in weft direction,and the gage factor of CNT yarn is 0.33 in warp direction and 0.1 in weft direction.Changing the warp float length of CNT/PVA yarn into woven fabric,the longer the float is,the higher the gage factor of the fabric is,and the gage factor of 6 consecutive floating lengths is 0.81.Changed the length of CNT/PVA yarn embedded into woven,within a certain range,the longer the length of embedded yarn,the higher of the gage factor of the fabric is.The experimental results show that embedded the CNT yarn of 3 cm into woven along the warp direction,the gauge factor is about 1.07 when applying the stretch of 7% to the woven fabric.The sensing woven fabric embedded the CNT yarn into plain with great sensing in small strain shows great prospect in the application of CNT yarn.