Implanting MOF Co-doped carbon nanotubes into PVP as flame-retardant to fabricate high performance PVA/SA aerogel nanocomposites

High-performance biocompatible flame-retardant polymer composites are considered one of the most promising candidates for next-generation biomedical engineering material. However, the practical applications are thought to appropriately contain flame retardancy and structural mechanical properties. In this study, the carbon nanotube (CNT), ZIF-67, and PVP have synergistically boosted polyvinyl alcohol (PVA)/sodium alginate (SA) composite with both excellent fire safety and mechanical properties, which first prepared with aqueous-phase mixed and freeze-drying method. As the addition of nano-fillers significantly improved the fire protection capability of PS nanocomposites, char residues were produced by aerogels at high temperatures. And the inorganic phase serves as a thermal barrier to prevent heat from spreading. The incorporation of CNTm/ZIF-67/PVP reduced the peak smoke release rate and peak heat release rate by 50% and 20.36%, respectively. In addition, the incorporation of nano-fillers also improved the compressive strength of the PS composites significantly, from 1.34 MPa to 2.45 MPa (Increased 82.8%). ZIFs heterogeneous nanoparticles synthesized with a high concentration of reactive groups provide a workable perspective on the future development of designing nano-filling flame-retardant polymer composites.