摘要
导电聚合物复合材料(CPC)被广泛用于柔性电阻式传感器的制备。然而由于聚合物基体的黏弹性,导致其电阻响应呈现松弛、滞后等黏弹性现象,这将会对制备的传感器精确表征造成不利影响,故在材料制备阶段减小电阻黏弹性对基于CPC的柔性电阻式传感器具有重要意义。选择了常用的零维炭黑(CB)及一维多壁碳纳米管(MWCNT)为导电填料,并通过在质量分数3%~7%间改变硅橡胶(SR)固化剂质量分数来调节基体模量,研究了基体模量及纳米填料维数对CPC电阻黏弹性的影响。研究结果显示,纳米填料质量分数为3%时,随着基体模量的增加,CB/SR的电阻松弛比从15%增加到34%,多壁碳纳米管/硅橡胶(MWCNT/SR)的电阻松弛比从40%增加到47%;动态循环加载下的应变灵敏度也随基体模量的增加而下降。相同固化剂质量分数即相同基体模量时,与MWCNT/SR相比,CB/SR的电阻松弛比、动态循环加载下的应变灵敏度下降程度和“肩峰”更小。因此,在制备过程中减小基体模量、使用零维导电纳米填料CB,均可减小CPC的电阻黏弹性。
Conductive polymer composites(CPCs)are widely used in the fabrication of flexible resistive sensors.However,due to the viscoelasticity of the polymer matrix,its resistance response shows viscoelastic phenomena such as relaxation and hysteresis,which will have a negative impact on the accurate characterization of the prepared sensor,so it is important to reduce the resistance viscoelasticity in the material preparation stage for flexible resistive sensors based on CPCs.By selecting the commonly used zero-dimensional carbon black(CB)and onedimensional multi-walled carbon nanotubes(MWCNTs)as conductive fillers,and changing the mass fractions of silicone rubber(SR)curing agent(from mass fractions of 3%to 7%)to adjust the matrix modulus,the effects of matrix modulus and nanofiller dimensionality on the resistive viscoelasticity of CPCs were studied.The results show that when the mass fraction of the nanofiller is 3%,the resistance relaxation ratio of CB/SR increases from 15%to 34%,and that of MWCNTs/SR increases from 40%to 47%with the increase of matrix modulus.Meanwhile,the strain sensitivity under dynamic cyclic loading decreases with the increase of matrix modulus.With the same mass fraction of curing agent,that is the same matrix modulus,the resistance relaxation ratio,the strain sensitivity decrease degree and the"shoulder"phenomenon under dynamic cyclic loading of CB/SR are smaller than those of MWCNTs/SR.Therefore,reducing the matrix modulus during the preparation process and using zero-dimensional conductive nanofiller such as CB can reduce the resistive viscoelasticity of CPCs.
作者
田新娅
魏小明
张云涛
母全祎
Tian Xinya;Wei Xiaoming;Zhang Yuntao;Mu Quanyi(School of Physics,Ningxia University,Yinchuan 750021,China)
出处
《微纳电子技术》
CAS
2024年第2期128-136,共9页
Micronanoelectronic Technology
基金
国家自然科学基金项目(12202218)
宁夏自然科学基金项目(2021AAC03101)
宁夏大学大学生创新项目(202310749265)。
