Study of Electrical Properties of Polyurethane Conductive Composites Reinforced with 3D Spacer Fabric Upon Compression

In this study, 3D spacer fabrics were prepared by chemical oxidation polymerization and then filled with polyurethane foam. Five different types of polyurethane conductive composite reinforced 3D spacer fabrics were prepared. Compression tests were performed on the prepared conductive composites under different test conditions to explore the effect of compression and impact factors on the electrical properties of the composites reinforced with 3D spacer fabrics. It is shown that the structure, thickness, and diameter of the spacer wire of the 3D spacer conductive fabric affect the conductivity of the conductive composites. At different compressive strains, the resistance change rate of the conductive compound decreases with increasing compressive period. As the compression period increases, the resistance change rate of the conducting compound gradually decreases. The change in mechanical hysteresis is larger than the change in electrical hysteresis in the compression recovery test for different strains. As the compression rate increases, the sensitivity of the conductive composite decreases, and there is a multivariate linear fit regression between the compression rate and the change in resistance. Fitting equations for the compression rate and resistance variations have been established, providing a theoretical basis for the theoretical study and application of conductive composites.