Wan Chun-Feng, Wen Bo, Dai Jian-Guo, Liu Jian-Xun, Liu Yu-Zhong
Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China.
Jiangsu Advanced Institute of Seismic Resistant Technology for Mechanical and Electrical Equipment, Xingzhuang Industrial Park, Lishui District, Nanjing 211200, China.
Materials (Basel). 2018 Jul 10;11(7):1174. doi: 10.3390/ma11071174.
The addition of a conductive material into polymer improves its mechanical properties, electrical properties and thermal conductivity and bestows it with good self-sensing and self-adjusting properties. In this study, carbon nanotubes-modified epoxy resins (CNTs-EP) were successfully prepared with good dispersion through the combined methods of three roller rolling, ultrasonic processing and adding surfactant. Tests were conducted to evaluate the resistivity of unloaded modified epoxy resins with different mixing amounts of carbon nanotubes (CNTs), to determine the conductive percolation threshold. On the basis of the test results, a series of monotonic and cyclic uniaxial tensile tests were then conducted to investigate the force sensitivity of the conductivity of epoxy resins modified with different mixing amounts of CNTs. The relationship between the stress and the resistivity under various mixing amounts was studied, indicating that the resistance response could play a good warning role on the damage of the modified polymer material.
在聚合物中添加导电材料可改善其机械性能、电性能和热导率，并赋予其良好的自传感和自调节性能。在本研究中，通过三辊轧制、超声处理和添加表面活性剂的组合方法，成功制备了具有良好分散性的碳纳米管改性环氧树脂（CNTs-EP）。进行测试以评估不同碳纳米管（CNTs）混合量的未加载改性环氧树脂的电阻率，从而确定导电渗流阈值。基于测试结果，随后进行了一系列单调和循环单轴拉伸试验，以研究不同CNTs混合量改性的环氧树脂电导率的力敏性。研究了不同混合量下应力与电阻率之间的关系，表明电阻响应可对改性聚合物材料的损伤起到良好的预警作用。
