Constructing the segregated networks is an efficient strategy to simultaneously achieve the high electrical conductivity and electromagnetic interference (EMI) shielding performance in conductive polymer composites (CPCs). Herein, an advanced molding technique based on microwave (MW)-assisted sintering was proposed to prepare the segregated ultrahigh molecular weight polyethylene/carbon nanotube (UHMWPE/CNT) composites. Scanning electron microscopy and optical microscopy images indicated that CNTs enriched on the surfaces of UHMWPE granules through ball milling, and the clear and complete conductive networks were observed in UHMWPE/CNT composites in the following MW sintering process, revealing that a perfect segregated structure was successfully constructed. The segregated UHMWPE/CNT composites exhibited an excellent electrical conductivity and EMI shielding performance of 49.3 S/m and 50 dB, respectively, along with a low percolation threshold of 0.10 vol%. Meanwhile, benefiting from the volumetric heating, an ideal mechanical property was also obtained in prepared composite by MW sintering. Compared with the conventional molding method, MW-assisted sintering shows its unique advantages, including better structural construction, shorter processing time, and lower energy consumption, which provides an efficient and environment-friendly method to fabricate CPCs with superior conductive and EMI shielding performance.

中文翻译：

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通过微波辅助烧结提高分离的 UHMWPE/CNTs 的机械和电磁干扰屏蔽性能

构建隔离网络是在导电聚合物复合材料 (CPC) 中同时实现高导电性和电磁干扰 (EMI) 屏蔽性能的有效策略。在此，提出了一种基于微波（MW）辅助烧结的先进成型技术来制备分离的超高分子量聚乙烯/碳纳米管（UHMWPE/CNT）复合材料。扫描电镜和光学显微镜图像表明，通过球磨，CNTs在UHMWPE颗粒表面富集，在随后的MW烧结过程中在UHMWPE/CNT复合材料中观察到清晰完整的导电网络，表明完美的分离结构成功建造。分离的 UHMWPE/CNT 复合材料表现出优异的导电性和 EMI 屏蔽性能，分别为 49.3 S/m 和 50 dB，以及 0.10 vol% 的低渗透阈值。同时，受益于体积加热，MW烧结制备的复合材料也获得了理想的力学性能。与传统成型方法相比，MW辅助烧结显示出其独特的优势，包括更好的结构构造、更短的加工时间和更低的能耗，为制造具有优异导电和EMI屏蔽性能的CPC提供了一种高效、环保的方法。通过MW烧结制备的复合材料也获得了理想的机械性能。与传统成型方法相比，MW辅助烧结显示出其独特的优势，包括更好的结构构造、更短的加工时间和更低的能耗，为制造具有优异导电和EMI屏蔽性能的CPC提供了一种高效、环保的方法。通过MW烧结制备的复合材料也获得了理想的机械性能。与传统成型方法相比，MW辅助烧结显示出其独特的优势，包括更好的结构构造、更短的加工时间和更低的能耗，为制造具有优异导电和EMI屏蔽性能的CPC提供了一种高效、环保的方法。