维生素C对聚合物/金属导电复合材料电磁屏蔽稳定性的影响  

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

作　　者：王月祥 董春雨[2] 韩阳阳 马卫海 WANG Yue-xiang;DONG Chun-yu;HAN Yang-yang;MA Wei-hai(China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect,Taiyuan 030032,China;33th Institute of China Electronics Technology Group Corporation,Taiyuan 030032,China)

机构地区：[1]中国-白俄罗斯电磁环境效应“一带一路”联合实验室,太原030032 [2]中国电子科技集团公司第三十三研究所,太原030032

出　　处：《合成橡胶工业》2024年第2期99-104,共6页China Synthetic Rubber Industry

摘　　要：采用熔融共混法制备了动态硫化热塑性弹性体(TPV)/镀镍(Ni)玻璃纤维(NCGF)/维生素C(VC)导电复合材料TPV/NCGF_(VC),系统研究了VC对该复合材料老化前后的微观形貌、分子结构及力学性能的影响,探讨了VC对Ni金属网络的选择性保护作用机制。结果表明,在TPV/NCGF复合材料中添加VC能够有效抑制老化过程中Ni导电网络的氧化,从而使复合材料表现出稳定的导电性和电磁屏蔽性能,其中电磁屏蔽效能保持率超过90%;在纯TPV基体中引入VC后,VC能有效抑制老化后TPV分子链的断裂;在TPV/NCGF_(VC)复合材料的老化过程中,VC优先与Ni网络发生还原反应,将NCGF表面Ni层因氧化生成的Ni离子(Ni^(2+))还原为单质Ni(Ni^(0)),表明VC对Ni金属网络具有选择性保护作用。Dynamic vulcanized thermoplastic elastomer(TPV)/nickel(Ni)coated glass fiber(NCGF)/vitamin C(VC)composites(TPV/NCGF_(VC))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/NCGF_(VC) 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.

关 键 词：导电复合材料 动态硫化热塑性弹性体 镀镍玻璃纤维 维生素C 老化性能 电磁屏蔽效能 微观结构 力学性能 

分 类 号：TQ334.2[化学工程—橡胶工业]