Direct writing printing technology and sensing performance test of CNT/PDMS
For the preparation of composite materials and the application requirements of CNT/PDMS compos-ites with conductive properties in flexible sensing directions,direct writing printing was combined with compos-ite material preparation.The direct writing printing technology of CNT/PDMS was studied and its sensing properties were tested.In the experiment,printing inks with different CNT content were prepared to test their bootstrap and electrical conductivity of printing ink.Inks with a 7％CNT content printed smoothly and could print complex structures.Premium selected 200 kPa extrusion pressure,20 mm/s printing speed could get smooth filaments.Printing effect of different shapes of mesh and electrical conductivity were tested,and a 60％density mesh for printing to be selected.To improve the electrical conductivity after curing,premium selected 80 ℃ and heated 2 hours to cure.On this basis,grid structures with different CNT content were printed to test.The sensitivity changed obviously in the range of 0-10 kPa pressure,then the rate of resistance change increased slowly.To apply different pressures to the material in a reciprocating way,the stability of the composite materi-al was good.When weights of different masses were pressed intermittently on the grid structure,the sensor res-olution of the composite material was good.These have laid a good foundation for the follow-up studies of direct writing printing technology to prepare composite materials.
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