ZIF-8

Catalog NumberACM59061539-7

CAS Number59061-53-9

CategoryMOF Flame Retardant

Synonyms	2-Methylimidazole zinc salt
Molecular Weight	227.58
Molecular Formula	C8H10N4Zn
Appearance	Off-white Powder
Storage	Store at room temperature or 4 °C in dry-state. Recommend to be activated at 150 ℃ in a vacuum oven for 3 hours before use
Ligand	2-Methylimidazole (CAS: 693-98-1)
Metal Content	Zn
Particle Size	100-400 nm, 300-600 nm, 0.6-1 μm, ~1 μm
Pore Size	0.34 nm; 1.1 nm
Pore Volume	0.66 cm³/g
Size	200 nm; 500 nm; 1 µm; 5 µm
Specific Surface Area	1500 m²/g (by BET)
Stability	Thermal stability: >400°C; Stable in air, aqueous and basic solution, not stable in acid solution

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Case Study

ZIF-8 Encapsulated Flame Retardant for Enhanced Fire Safety in Epoxy Resin

Meng, Weihua, et al. Microporous and Mesoporous Materials 314 (2021): 110885.

This study examined the development and application of a novel flame retardant system comprising ZIF-8 encapsulated hexachlorocyclotriphosphazene (ZIF-8@HCCP) for improving the fire safety of epoxy resin (EP).
Preparation: ZIF-8@HCCP was synthesized using a one-pot approach where 2-methylimidazole was dissolved in methanol and combined with HCCP, followed by dropwise addition of zinc nitrate hexahydrate solution. The resulting precipitate was collected via centrifugation and washed with ethanol. Different loading amounts (ZP-10, ZP-25, ZP-50) were achieved by varying HCCP quantity. For epoxy composites, ZIF-8@HCCP was dispersed in EP at 60°C, followed by addition of m-phenylenediamine hardener. The mixture was cured at 80°C for 2 hours and 150°C for 3 hours.
Key Results:
· The ZIF-8@HCCP composite demonstrated exceptional thermal stability with a decomposition temperature of 550.9°C, significantly higher than pure HCCP (105.6°C). When incorporated into epoxy resin at 4 phr loading, the composite showed remarkable flame retardancy and smoke suppression.The peak heat release rate, smoke release rate, and CO release rate of EP/ZIF-8@HCCP were decreased by 56.2%, 57.2%, and 45.7%, respectively.
· The material exhibited temperature-responsive transient release behavior and a unique "quenching mechanism" where ZIF-8 structure collapse enables rapid flame retardant release. The encapsulated EP composites maintained good mechanical properties while achieving superior fire safety.

ZIF-8@MXene Reinforced Polymer Composite Electrolyte for Safe and High-Performance Lithium Metal Batteries

Zhao, Xufeng, et al. Journal of Colloid and Interface Science 620 (2022): 478-485.

This work reported the development and performance of a ZIF-8@MXene reinforced polymer composite electrolyte designed to address key challenges in solid-state lithium metal batteries, including low ionic conductivity, poor thermal stability, and flammability.
Preparation Strategy: Two-dimensional ZIF-8 modified Ti3C2-MXene (ZIF-8@MXene) nanosheets were synthesized through in-situ growth of ZIF-8 on MXene layers. The polymer composite electrolyte (PE-ZIF-8@MXene) was fabricated by incorporating these nanosheets into a polymer matrix consisting of poly(ethylene oxide) (PEO) and poly(vinylidene fluoride-hexafluoro propylene) (PVDF-HFP). The ZIF-8@MXene nanosheets were uniformly distributed throughout the polymer matrix to create a homogeneous composite structure.
Key Results:
· The incorporation of ZIF-8@MXene nanosheets significantly enhanced the performance of the polymer composite electrolyte, demonstrating a high ionic conductivity of 4.4 mS/cm, an exceptional lithium ion transference number of 0.76, and improved mechanical strength with a tensile strength of 3.77 MPa.
· The composite exhibited remarkable flame retardancy and thermal stability while effectively suppressing lithium dendrite formation. These superior properties translated into outstanding electrochemical performance, with lithium symmetric cells achieving stable cycling for over 2000 hours at 0.5 mA/cm2 and Li|LiFePO4 cells maintaining 89.6% capacity retention after 500 cycles.

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