导电高分子复合材料压缩电阻松弛现象及机理浅析

onductive polymer composite can be used as the sensitive material of flexible piezoresistive sensor. To study the changes in the electrical resistance of the composite during the compressive stress relaxation (i.e. compressive resistance relaxation), carbon nanotube filled silicone rubber composite is fabricated by using solution mixing method, and the data for the changes in the resistance and the stress of the composite during the compressive stress relaxation are measured and analyzed. The experimental results show that the compressive resistance relaxation is similar to the compressive stress relaxation (i.e. both the resistance and the stress decay gradually and get more and more steady over time). From the angle of the changes in the microstructure of the composite, the mechanism for the compressive resistance relaxation is explained, and the relation between the changes in the conductive network in the composite and the movements of the polymer segments is established.