دانلود رایگان مقاله افزایش رسانای سه بعدی ساختار توپولوژیکی الاستومر مگنتورئوجیکال

Abstract

Conductive magnetorheological elastomers (MREs) consisting of carbonyl iron particles (CIPs), polydimethylsiloxane matrix and carbon nanotube (CNT) covered polyurethane sponge (PUS) were developed. The CIPs were linearly orientated within the porous PUS and the magnetic saturation modulus of PUS-reinforced anisotropic MRE was 1.3 MPa when CIPs content was 70 wt%. This MRE presented typical magnetorheological (MR) effects and the shear storage modulus increased from 0.49 MPa to 0.64 MPa after reinforcing the anisotropic MRE with PUS. Owing to the presence of the CNTs on the PUS networks, the final MRE was conductive. The electrical resistance of the MRE increased with increasing tensile strain, ranging from 27.5 kΩ to 30.5 kΩ at various tensile rates (50, 100, 150, 200, 250 and 300 mm/min respectively). As a result, the smart MRE was effective in a flexible, sensitive and reversible strain sensor.

4. Conclusion

In summary, a novel conductive MRE consisting PDMS, porous PUS, CNTs and CIPs was fabricated. Owing to the enhancing effect of the porous 3D continues structure, the MR effect and magnetic induced modulus of the MRE were significantly improved. The magnetic saturation modulus of A-MRE with sponge was 1.30 MPa when CIPs content was 70 wt%. The MR effect of A-MRE and A-PUS-MRE decreased from 104% to 97.0% and the magnetic induced modulus had increased from 0.49 MPa to 0.64 MPa. The high sensitive and low cost MRE tensile sensor can maintain consistent resistance with various stretching forces under different extension rates. This work provided a new way to design and improve the properties of the MREs. The final products have significant potential in terms of applying them to sensors.