Segregated MWCNT Networks in XNBR via Interfacial Assembly for Enhanced Mechanical, Dielectric, and EMI Shielding Performance

Segregated networks of carboxylated multiwalled carbon nanotubes (MWCNTRs) were developed in carboxylated acrylonitrile–butadiene rubber (XNBR) through latex‐stage processing. The composites exhibited a low electrical percolation threshold of approximately 0.05 vol% and an increase in dielectric constant from 23 for unfilled XNBR to approximately 7000 at 7 phr MWCNTR (100 Hz). At 0.3 phr, tensile strength and 300% modulus improved by approximately 65% and 32%, respectively. A maximum EMI shielding effectiveness of 5.3 dB was obtained in the X‐band (8–12 GHz). Microscopic observations and strain‐sweep measurements supported segregated network formation, while swelling studies indicated improved solvent resistance. These findings demonstrate that the segregated MWCNTR network contributes to enhanced electrical, dielectric, and mechanical properties, with moderate EMI shielding performance.