It is greatly important to shield the X-band electromagnetic radiation and meanwhile possess a high temperature resistant performance for the outer sealing materials of hypervelocity air aircrafts. In this work, novel ceramifiable electro-conductive polymer composites were prepared by incorporating glass powder (GP), mica powder (MP), organo-modified montmorillonite (OMMT), and short carbon fiber (SCF) into ethylene-vinyl acetate (EVA). The prepared EVA/GP/MP/OMMT/SCF displayed excellent electromagnetic interference (EMI) shielding performance before and after treating at 1000 ℃ and also had a high temperature resistant feature via the ceramization. For the EVA/GP/MP/OMMT/SCF composite with a weight ratio of 35/23/17/5/20, its EMI shielding effectiveness (SE) reached 36.0 dB at 2.6 mm thickness, and its ceramic formed at 1000 °C possessed about 30.0 dB of EMI SE. Moreover, the formed ceramic did not show any change during a vertical burning test. Mechanism for the high SE before and after high temperatures were revealed.

屏蔽X波段电磁辐射，同时对超高速飞机的外部密封材料具有较高的耐高温性能非常重要。在这项工作中，通过将玻璃粉（GP），云母粉（MP），有机改性的蒙脱石（OMMT）和短碳纤维（SCF）掺入乙烯乙酸乙烯酯（EVA）中，制备了新型可陶瓷导电聚合物复合材料。所制备的EVA / GP / MP / OMMT / SCF在1000℃处理前后表现出优异的电磁干扰（EMI）屏蔽性能，并且通过陶瓷化具有耐高温特性。对于重量比为35/23/17/5/20的EVA / GP / MP / OMMT / SCF复合材料，其EMI屏蔽效率（SE）在2.6 mm厚度下达到36.0 dB，并且其陶瓷在1000°C下形成拥有约30个。EMI SE为0 dB。而且，所形成的陶瓷在垂直燃烧试验中没有显示任何变化。揭示了高温前后高SE的机理。