Dynamic vulcanized thermoplastic elastomer(TPV)/nickel(Ni)coated glass fiber(NCGF)/vitamin C(VC)composites(TPV/NC GFvc)were pre-pared 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 dis-cussed.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 con-ductivity 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 ther-mal 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.
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