Multifunctional epoxy composites with low flammability, high ablation resistance, superior electrical conductivity and outstanding electromagnetic interference (EMI) shielding performances are prepared by a two-step procedure. The first step involves pyrolysis of lignin-resorcinol-glyoxal pre-polymer into carbon foams, while the second step is infiltrating flame retardant epoxy resins (FREP) into the highly porous carbon foams. SEM images show that the three-dimensional network microstructure of carbon foams is integrally preserved during infiltration by the epoxy resins, which could serve as an effective pathway for electron transport. For the flame-retardant carbon foam/epoxy (FREP-CF) composite, a UL-94 V-0 classification is achieved. In the cone calorimeter measurement, the peak heat release rate and the total heat release of the FREP-CF composite are reduced by 64% and 37%, respectively, compared to those of the original epoxy resin. The FREP-CF composite can resist approximately 1000 °C flame for 10 min with the temperature on the back side lower than 200 °C, which is much better than the EP-CF composite. Additionally, a notable electrical conductivity of 216 S/m and a superior EMI shielding effectiveness of 33.5 dB are achieved for the FREP-CF composite. This multifunctional epoxy composite enables it a promising candidate for electronics, aerospace and transportation applications.

通过两步法制备具有低易燃性，高耐烧蚀性，优异的导电性和出色的电磁干扰（EMI）屏蔽性能的多功能环氧复合材料。第一步涉及将木质素-间苯二酚-乙二醛预聚物热解为碳泡沫，而第二步为将阻燃环氧树脂（FREP）渗透到高度多孔的碳泡沫中。SEM图像表明，碳泡沫的三维网络微观结构在环氧树脂渗透过程中被完整地保留下来，这可以作为电子传输的有效途径。对于阻燃碳泡沫/环氧树脂（FREP-CF）复合材料，可达到UL-94 V-0等级。在锥形量热仪的测量中 与原始环氧树脂相比，FREP-CF复合材料的峰值放热速率和总放热分别降低了64％和37％。FREP-CF复合材料可以抵抗大约1000°C的火焰10分钟，并且背面温度低于200°C，这比EP-CF复合材料要好得多。此外，FREP-CF复合材料的导电率达216 S / m，EMI屏蔽效果达33.5 dB。这种多功能环氧复合材料使其成为电子，航空航天和运输应用的有希望的候选者。比EP-CF复合材料好得多。此外，FREP-CF复合材料的导电率达216 S / m，EMI屏蔽效果达33.5 dB。这种多功能环氧复合材料使其成为电子，航空航天和运输应用的有希望的候选者。这比EP-CF复合材料好得多。此外，FREP-CF复合材料的导电率达216 S / m，EMI屏蔽效果达33.5 dB。这种多功能环氧复合材料使其成为电子，航空航天和运输应用的有希望的候选者。