CNT/PDMS柔性传感材料的打印工艺及性能研究  

Research on Printing Process and Perfomance of CNT/PDMS Soft Sensing Material

作　　者：徐雪杰 朱子才[1,2] 罗斌[1,2] 何青松 XU Xuejie;ZHU Zicai;LUO Bin;HE Qingsong(School of Mechanical Engineering,Xi,an Jiao tong University,Xi'an 710049;State Key Laboratory of Mechanical Structural Strength and Vibration,Xi,an Jiaotong University,Xi'an 710049;College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016)

机构地区：[1]西安交通大学机械工程学院,西安710049 [2]西安交通大学机械强度与振动国家重点实验室,西安710049 [3]南京航空航天大学机电学院,南京210016

出　　处：《机械工程学报》2020年第15期97-103,共7页Journal of Mechanical Engineering

基　　金：国家自然科学基金重大研究计划资助项目(91648110)。

摘　　要：针对复合导电材料CNT/PDMS应用于柔性传感以及复杂结构设计的需求,将直写打印技术与该复合导电材料的成型制备方法结合起来,研究了CNT/PDMS复合材料的打印工艺和电阻传感性能。在试验研究中,首先配置了不同CNT含量的打印墨水,并对打印墨水的流变性及材料导电性进行测试,试验结果表明配置的打印墨水均具有粘弹性以及剪切变稀的性质,其中以CNT质量分数为7%的墨水用于直写打印时兼具导电性好易挤出且成型好的特点。通过单点成线试验,设置3D打印机参数为:扫描速度为10mm/s,挤出气压为0.3MPa。在此基础上,进行简单平面条状、二维网状结构以及立体网格结构的打印,对打印的条状结构进行温度和单轴拉伸试验,在不同的温度和拉伸率下打印件均表现有电阻传感特性;对网格状电路进行柔性电路性能测试,在对其施加6 V左右电压时,无论网格电路处于伸展还是弯曲状态均能表现出良好的导电性能;对打印的立体网格结构进行压力传感试验,结果表明复合材料有良好的压敏特性。性能表征结果证明该打印工艺可行,从而为后续该材料的复杂结构制造以及在柔性传感电子设备中的应用奠定基础。According to the requirements of the application of CNT/PDMS in soft ciruit and complex structure design, the direct writing printing technology is combined with the molding preparation method of the hybrid conductive material, and the printing process of CNT/PDMS is studied. Firstly, the printing ink of mixed materials with different CNT content is configured, and the rheological property and material conductivity are measured. All the printing inks are shear thinned and viscoelastic, among which the printing ink with CNT content of 7% is of good conductivity, easy to extrude and formed. The printer parameters are set as follows: scanning speed is 10 mm/s, extrusion pressure is 0.3 MP, and the printing process is stable. On this basis, the simple planar strip, two-dimensional mesh structure and three-dimensional grid structure are printed, and the temperature and uniaxial tensile experiments are carried out on the printed strip structure. The printed sample shows resistance sensing characteristics at different temperatures and tensile rates. The flexible circuit performance of the grid-like circuit is tested. When the voltage of about 6 V is applied, the grid-like circuit shows good electrical conductivity in the stretching or bending state. The pressure sensing experiment on the printed 3 D grid structure shows that the composite material with good pressure sensitivity. The results of performance characterization proves that the printing process is feasible, which laid a foundation for the subsequent complex structure manufacturing of the material and its application in flexible sensing electronic equipment.

关 键 词：增材制造 柔性电路 电阻传感 直写打印 

分 类 号：TP24[自动化与计算机技术—检测技术与自动化装置] TP331[自动化与计算机技术—控制科学与工程]