"Effect of vitamin C on electromagnetic shielding stability of polymer/metallic conductive composites"

Abstract

Dynamic vulcanized thermoplastic elastomer (TPV)/nickel (Ni) coated glass fiber (NCGF)/vitamin C(VC) composites(TPV/NCGFVC) were prepared by melt blending method. The effects of VC on micromorphology, molecular structure and mecha-nical properties of the composites before and after aging were systematically studied. The mechanism of selective protection of VC on Ni network was discussed. The results showed that the addition of VC in TPV/NCGF composites could effectively inhibit the oxidation of Ni conductive network during the aging process, so that the composites showed stable conductivity and electromagnetic shielding effectiveness with the electromagnetic shielding effectiveness retention rate of over 90%. After VC was introduced into the pure TPV matrix, it could effectively inhibit the fracture of the molecular chain of TPV after thermal oxidative aging. During the aging process of TPV/NCGFVC composite, VC reacted preferentially with the Ni network to reduce the Ni ions generated from by the oxidation of the Ni layer on the surface of NCGF to elemental Ni, indicating that VC had a selective protective effect on the Ni metal network.

Keywords

• conductive composite， dynamic vulcanized thermoplastics elastomer， nickel coated glass fiber， vitamin c; aging performance， electromagnetic shielding effectiveness， microstructure， mechanical property，