Octavinyloctasilasesquioxane

Catalog NumberACM69655761-8

CAS Number69655-76-1

CategoryNano Flame Retardant

Synonyms	Octavinyl POSS
IUPAC Name	PSS-Octavinyl substituted
Molecular Weight	633.04 g/mol
Molecular Formula	C16H24O12Si8
SMILES	C=C[Si]12O[Si]3(O[Si]4(O[Si](O1)(O[Si]5(O[Si](O2)(O[Si](O3)(O[Si](O4)(O5)C=C)C=C)C=C)C=C)C=C)C=C)C=C
InChI Key	ZWCNRMDCQDJIRL-UHFFFAOYSA-N
Boiling Point	329.4ºC at 760mmHg
Melting Point	> 350 °C
Flash Point	148.4ºC
Purity	0.98
Density	1.22 g/cm³
Appearance	White Solid Powder
Storage	Stored in a cool and dry place, away from the fire, heat source
Form	Nanopowder

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Case Study

Octavinyloctasilasesquioxane as a Cross-Linking Agent for Superhydrophobic and Flame-Retardant Coatings on Cotton Fabric

Chen, Ting, et al. Progress in Organic Coatings 186 (2024): 108038.

Octavinyloctasilasesquioxane (V-POSS) acts as a reactive cross-linking agent in a fluorine- and phosphorus-containing polymer coating, enabling the fabrication of cotton fabric with superhydrophobicity, enhanced flame retardancy, and efficient oil-water separation.
Fabrication Process: A fluorine-phosphorus polymer (PFDB) was synthesized via RAFT polymerization. V-POSS was mixed with PFDB, and the solution was dip-coated onto cotton fabric. The coating was cross-linked by UV curing, followed by breath figure treatment to create a hierarchical porous structure.
Performance Evaluation: The modified cotton fabric (SF-cotton) achieved a water contact angle of 158 ± 2.3°, demonstrating superhydrophobicity. It repelled acid-base solutions, soy sauce, coffee and milk, showing self-cleaning and anti-fouling properties. The superhydrophobic/super-oleophilic surface enabled oil-water separation with 98% efficiency, maintained even after 100 cycles. V-POSS contributed to enhanced flame retardancy and thermal stability due to its silicon-containing cage structure, which, together with phosphorus and fluorine, provided a synergistic flame-retardant effect. The coating also exhibited good chemical resistance and durability.
Application Significance: V-POSS enables a durable, multi-functional coating for cotton fabrics, suitable for protective textiles, oil spill cleanup, and self-cleaning materials.

Octavinyloctasilasesquioxane as a Monomer for Nanoporous Flame-Retardant and Thermal Insulation Polymers

Wang, Fei, et al. Reactive and Functional Polymers 143 (2019): 104345.

Octavinyloctasilasesquioxane (Octavinyl POSS) acts as a rigid, reactive monomer for the solvothermal synthesis of monolithic nanoporous polymers (PDVB-POSS) with excellent flame retardancy and low thermal conductivity, combining intrinsic fire safety with efficient thermal insulation.
Fabrication Process: Octavinyl POSS was synthesized via hydrolysis condensation of vinyltrimethoxysilane. The monomer was copolymerized with divinylbenzene (DVB) at molar ratios of 1:4 or 1:2 in tetrahydrofuran/water using AIBN as initiator at 65 °C for 72 h, followed by freeze drying to obtain monolithic porous polymers.
Performance Evaluation: FTIR and solid-state 13C NMR confirmed successful polymerization. SEM showed a three-dimensional porous network with mesopores (8-13 nm). BET surface areas were 298-319 m²/g. Thermal conductivity measured as low as 0.024 W/m/K (PDVB-POSS 1:4), outperforming traditional insulation materials. Torch burn tests demonstrated self-extinguishing behavior without melt dripping. Microscale combustion calorimetry revealed peak heat release rates (pHRR) of 218 and 129 W/g for the two formulations, reductions of 62% and 78% compared to neat PDVB (576 W/g). TGA showed improved thermal stability with char residues of 40-53% at 800 °C. SEM-EDX confirmed uniform distribution of Si and O in the polymer skeleton. The flame-retardant mechanism involves formation of a compact Si-O-Si-rich char layer that acts as a heat and oxygen barrier.
Application Significance: Octavinyl POSS enables scalable, high-performance monolithic porous polymers for energy-saving coatings requiring both thermal insulation and fire safety.

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