A conductive composite foam based on poly(styrene-butadiene-styrene)/carbon nanotube (SBS/CNT) for electromagnetic interference shielding

Porous conductive polymer composites (PCPC) have experienced a flourishing development in the domain of electromagnetic interference (EMI) shielding materials. Herein, a conductive poly(styrene-butadiene-styrene)/carbon nanotube (SBS/CNT) composite foam with three-dimensional networks was fabricated by a freeze-drying technology. The SBS elastomer helps to strengthen the CNT framework and improve the mechanical strength of the composite foam. With a loading of 9 wt.% CNTs, the composite foam exhibits an excellent compression modulus of 1.15 MPa and a good recovery of 32%. Furthermore, it also shows an outstanding total EMI shielding effectiveness above 47 dB within the frequency scope of 8.4-12.4 GHz as well as an electrical conductivity of 51.8 S/m.