In this study, a flexible strain sensor with ultrahigh stretchability, outstanding sensitivity, and excellent repeatability based on conductive carbon black (CB) and nitrile butadiene rubber (NBR) was presented. Two organic solvents with three different coating time during the dissolve-coating process were investigated. The morphology and the degradation temperature of all the NBR/CB composite films were studied, and the tensile strength, elongation at break, as well as the young’s modulus and the dissipated energy for all the specimen were revealed. The strain-sensing tests indicated that the NBR/CB film possess a good sensitivity (max. gauge factor = 24.9) and an ultrahigh sensing range (max. 681% strain). The mathematic model from Simmons for predicting the sensing behavior based on the tunneling theory was further simplified, and a novel equation was proposed for predicting the relative change of resistance as a function of time during the cyclic test, which showed great agreement with the cyclic strain-sensing data in experiments. Overall, this study introduces a simple low-cost fabrication method for preparing the polymeric flexible strain sensors with great strain-sensing performance. The development of the two mathematical modellings makes several noteworthy contributions to the existing knowledge of strain-sensing behavior.

在这项研究中，基于导电炭黑（CB）和丁腈橡胶（NBR），提出了一种具有超高拉伸性，出色的灵敏度和出色的重复性的柔性应变传感器。研究了在溶涂过程中两种具有三种不同涂覆时间的有机溶剂。研究了所有NBR / CB复合膜的形貌和降解温度，揭示了所有试样的拉伸强度，断裂伸长率，杨氏模量和耗散能。应变传感测试表明，NBR / CB薄膜具有良好的灵敏度（最大应变系数= 24.9）和超高的传感范围（最大681％应变）。Simmons基于隧道理论预测传感行为的数学模型进一步简化，提出了一种新的方程，用于预测循环试验过程中电阻的相对变化随时间的变化，与实验中的循环应变传感数据吻合得很好。总的来说，本研究介绍了一种简单的低成本制造方法，以制备具有出色应变传感性能的聚合物柔性应变传感器。两种数学模型的发展为应变传感行为的现有知识做出了一些值得注意的贡献。这项研究介绍了一种简单的低成本制造方法，以制备具有良好应变传感性能的聚合物柔性应变传感器。两种数学模型的发展为应变传感行为的现有知识做出了一些值得注意的贡献。这项研究介绍了一种简单的低成本制造方法，以制备具有良好应变传感性能的聚合物柔性应变传感器。两种数学模型的发展为应变传感行为的现有知识做出了一些值得注意的贡献。