Abstract
Zeolitic imidazolate framework-8 (ZIF-8) was synthesized and used as a flame retardant in polyvinyl alcohol (PVA) aerogels. The introduction of ZIF-8 increased the roughness of the cell walls due to attachment of the ZIF-8 particles. The ZIF-8 also promoted the thermal degradation of PVA, but increased the residue yield. The limiting oxygen index (LOI) increased from 19.5% for pure PVA aerogel to 24.0% for the ZIF-8/PVA hybrid aerogel. The self-extinguishing behavior of the ZIF-8/PVA hybrid aerogel was observed in the UL-94 vertical burning test, while the PVA aerogel burned out finally. The peak heat release rate (PHRR) and total heat release (THR) of the ZIF-8/PVA hybrid aerogel were 44.2% and 12.8% lower than those of pure PVA aerogel, respectively. The decomposition of ZIF-8 to zinc oxide enhanced the barrier effect of the residues, which accounted for the suppressed PHRR and THR. This study demonstrated that incorporation of ZIF-8 can result in tunable flame retardancy for fire safety application.
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