Low-density polyethylene (LDPE)/Multiwall-Carbon-Nanotube (MWCNT) nanocomposites were foamed using supercritical carbon dioxide (CO₂). Uniform nanofiller dispersion was assessed by scanning electron microscopy (SEM), rheological measurements, and wide-angle X-ray diffraction (WAXD). By incorporating MWCNTs in the matrix, the average cell size was reduced to less than one-third that of neat foam (from 32.92 to 9.24 µm), and cell density jumped from 0.205 × 10⁹ to 5.26 × 10⁹ cell/cm³. After evaluating the thermal, mechanical, and electrical properties of the nanocomposites and their foams, as well as elucidating the foaming process's role in the crystalline structure, there was a great need to boost the mechanical performance. Hence, ultra-high molecular-weight-polyethylene (UHMWPE) fiber was embedded in the system, which is a reliable reinforcement for, and compatible with, the polyethylene, owing to its basic similarity to the matrix. The electrical conductivity of the solid and foamed materials was greatly improved by the addition of 15 wt% UHMWPE fibers and 1.4 wt% filler.

使用超临界二氧化碳（CO ₂）将低密度聚乙烯（LDPE）/多壁碳纳米管（MWCNT）纳米复合材料发泡。通过扫描电子显微镜（SEM），流变学测量和广角X射线衍射（WAXD）评估纳米填料的均匀分散性。通过在基体中掺入MWCNT，平均泡孔尺寸减少到不到纯泡沫的三分之一（从32.92到9.24 µm），泡孔密度从0.205×10 ⁹跃升至5.26×10 ⁹泡孔/ cm ³。在评估了纳米复合材料及其泡沫的热，机械和电性能，并阐明了发泡过程在晶体结构中的作用后，非常需要提高机械性能。因此，将超高分子量聚乙烯（UHMWPE）纤维嵌入系统中，由于它与基质的基本相似性，因此是聚乙烯的可靠增强材料并与聚乙烯兼容。通过添加15 wt％的UHMWPE纤维和1.4 wt％的填料，可以大大提高固体和泡沫材料的电导率。