Transition metal (Co or Fe) containing polyhedral oligomeric silsesquioxane complexes (M@POSS–COOH) were prepared from octa carboxyl polyhedral oligomeric silsesquioxane (OC–POSS). The structures of OC–POSS and M@POSS–COOH were characterized by FT–IR, NMR, MALDI–TOF MS and XRD. Fe@POSS–COOH and Co@POSS-COOH possess mesoporous structures, whose Brunauer–Emmett–Teller surface areas (S_BET) are 58.7 m²/g and 46.3 m²/g, respectively. The remaining carboxyl groups of M@POSS–COOH that can react with epoxy groups along with the mesoporous structure increase the network strength of the epoxy resin (EP), and play a significant role in improving the mechanical properties, dielectric properties and thermal properties of the composites. Furthermore, the elemental composition of transition metal and silicon oxygen in the M@POSS–COOH structures significantly increases the amount of char residues of EP composites during the combustion of the material through elements catalysis and surface enrichment, which significantly reduces the toxic smoke density and fire hazards of EP composites. The structural and elemental merits of M@POSS–COOH significantly improve the overall performance of epoxy resin and occupy broad application space.

含过渡金属（钴或铁）的多面体低聚倍半硅氧烷复合物（M @ POSS–COOH）是由八羧基多面体低聚倍半硅氧烷（OC–POSS）制备的。通过FT-IR，NMR，MALDI-TOF MS和XRD对OC-POSS和M @ POSS-COOH的结构进行了表征。Fe @ POSS-COOH和Co @ POSS-COOH具有介孔结构，其Brunauer-Emmett-Teller表面积（S _BET）为58.7 m ² / g和46.3 m ²/ g。可以与环氧基反应的M @ POSS–COOH的其余羧基以及中孔结构提高了环氧树脂（EP）的网络强度，并在改善其机械性能，介电性能和热性能方面起着重要作用复合材料。此外，M @ POSS–COOH结构中过渡金属和硅氧的元素组成通过元素催化和表面富集，在材料燃烧过程中显着增加了EP复合材料的残炭量，从而显着降低了有毒烟雾密度和EP复合材料的火灾隐患。M @ POSS–COOH的结构和元素优点极大地改善了环氧树脂的整体性能，并占据了广阔的应用空间。