The continuity of conductive network and conductivity performance in double-percolated conductive polymer composites (CPCs) can be improved after static annealing, though, there are often increased viscosities in CPCs when filler contents increased, making annealing process difficult. Herein, the incompatible polycaprolactone (PCL)/polystyrene (PS) systems were designed to double-percolated PCL/PS/multi-wall carbon nanotube (MWCNT) composites, subsequently, thermal and plasticizing effects during carbon dioxide (CO₂) annealing were combined to assist phase coalescence. Benefiting from viscosity reduction, phase coarsening, electrical conductivities and electromagnetic interference shielding effectiveness (EMI SE) of PCL/PS/MWCNT composites were promoted even at 5 wt. % filler content. After supercritical CO₂ annealing, percolation threshold decreased from 0.50 wt. % to 0.24 wt. %, and EMI SE increased from 31.8 dB to 39.8 dB, which improved 25 %. This work demonstrates phase coarsening of double percolated CPCs is effectively controlled by CO₂ annealing conditions, and the final degree of performance improvement is connected to polymer systems.

双渗透导电聚合物复合材料（CPC）的导电网络的连续性和导电性能在静态退火后可以得到改善，但是，当填料含量增加时，CPC 中的粘度通常会增加，从而使退火过程变得困难。在此，将不相容的聚己内酯(PCL)/聚苯乙烯 (PS) 系统设计为双渗滤 PCL/PS/多壁碳纳米管 (MWCNT) 复合材料，随后，结合了二氧化碳 (CO 2 ) 退火过程中的热效应和塑化_效应协助相聚结。受益于粘度降低、相粗化、电导率PCL/PS/MWCNT 复合材料的电磁干扰屏蔽效能 (EMI SE) 甚至在 5 wt. 时也得到提​​升。%填料含量。超临界 CO ₂退火后，渗透阈值从 0.50 wt. % 至 0.24 重量。%，EMI SE 从 31.8 dB 增加到 39.8 dB，提高了 25 %。_{这项工作表明，双渗滤 CPC 的相粗化可通过 CO 2退火条件}有效控制，并且性能改善的最终程度与聚合物系统有关。