In the cyclosilazane monomer spectrum, the "four-membered Si-NH-Si alternating backbone" and "methyl+vinyl bis-substitution on four Si centers (Me/Vi half-half)" jointly dictate ring-opening activity under acid/base/Pt catalysis, dual-reactive boundary of vinyl participating hydrosilylation/radical crosslink, and stoichiometric precision of pyrolysis to Si-C-N ceramic in polymer-derived ceramic (PDC) routes. Plain HMDS only end-caps no crosslink; octamethylcyclotetrasilazane has no vinyl for addition cure; all-vinyl cyclosilazane gels too easily in storage. As ultra-high-MW vinylmethylpolysilazane, inorganic powder silylation, addition silicone high-temp reinforcing crosslinker, polyborosilazane/polysiloxysilazane precursor, CVD/ALD SiCN thin film, and Li-battery electrolyte additive demand "stable four-ring, controllable tetravinyl, ≥95% main content, colorless transparent, ton-drum supply," sourcing a C₁₂H₂₈N₄Si₄ (MW 340.72), density ~0.95g/cm³, 20kg/160kg/800kg IBC product has become the core gap for domestic cyclosilazane monomer localization.
Addressing this "tetravinyl cyclic N" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Tetravinyltetramethylcyclotetrasilazane IOTA N3602 (CAS 5162-63-0, 1,3,5,7-Tetramethyl-1,3,5,7-tetravinylcyclotetrasilazane). Characterized by "colorless transparent liquid, main content ≥95%, C₁₂H₂₈N₄Si₄/MW 340.72, density ~0.95g/cm³ (20℃), RI ~1.495, soluble in benzene/toluene/ethanol, 20kg PE/160kg iron/800kg IBC, cool dry ventilated storage, moisture-proof (Si-NH hydrolyzes)," and backed by "four-ring Si-N opening activity + tetra-vinyl dual-reactive site + methyl stabilized storage," it serves as the "cyclic azane anchor" for polysilazane synthesis, PDC ceramic precursor, silicone high-temp crosslink, and inorganic powder modification.
Molecular Architecture: Four-Membered Si-N Ring + Me/Vi Half-Half + Ring-Open/Addition Dual-Activity 3D Logic
The core competitiveness of IOTA N3602 stems from its "[-Si(CH₃)(CH=CH₂)-NH-]₄ four-membered ring" architecture (each Si bears one methyl and one vinyl, four NH on ring):
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Four-Ring Opening Activity: Four-membered ring has higher strain than six-ring; under trace acid (carboxylic/Lewis) or Pt catalyst plus heat, Si-NH protonates and opens to linear vinylmethylpolysilazane (Vi-Me-PZ), MW controllable to ultra-high (>10⁵); vs direct linear prepolymer, ring-opening yields regular chain ends, low branching.
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Tetra-Vinyl Dual Site: Each Si-vinyl gives addition-cure site—hydrosilylation with H-silicone/H-silazane under Pt, or radical crosslink with peroxide; meanwhile four ring-NH condense with inorganic powder (SiO₂/Al₂O₃/BN) surface OH, achieving silylation coating, boosting organic-phase compatibility.
/ Methyl Stabilized Storage: Four methyls occupy remaining valences, lower electron density, suppress self-polymer; vs all-vinyl cyclosilazane, N3602 under N₂, water-free, <30℃ stays months without gel, main content ≥95%.
Performance Leap: From "HMDS End-Cap Only" to "Tetravinyl Cyclic Open+Cure Dual-Use"
Incorporating IOTA N3602 enables qualitative leaps:
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Ultra-High-MW Vi-Me-PZ: Cationic ring-open polymerization yields vinylmethylpolysilazane (precursor to SiCN ceramic fiber, or high-temp modifier for addition LSR, no cracking >350℃).
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Silicone High-Temp Reinforce: Blend 0.5-3% N3602 into addition LSR/HTV, vinyl crosslinks into Si-N-Si bridge network—after 200℃×72h aging hardness change <5%, tensile retention >85% (plain LSR ~70%).
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Inorganic Powder Modification: Ball-mill nano-SiO₂/BN with N3602, NH condenses with powder OH, vinyl outward—filler turns hydrophobic, dispersion in silicone/epoxy +30%.
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PDC Ceramic & CVD: Pyrolysis → Si-C-N ceramic (>1200℃ oxidation resistant); CVD/ALD SiCN film (semiconductor passivation, barrier).
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Li-Battery Electrolyte: Reduces on anode to Si-N containing SEI, suppresses dendrite, improves high-temp cycle.
Application Penetration: From Polysilazane Precursor to Li-SEI
IOTA N3602 covers sectors triply sensitive to "ring-N open + vinyl crosslink + ceramic-grade heat":
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Polysilazane Synthesis: Ultra-high-MW Vi-Me-PZ, polyborosilazane, polysiloxysilazane feedstock.
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Advanced Ceramic: PDC SiCN/Si₃N₄ ceramic fiber, vapor-deposit micro-nano composite ceramic powder.
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Silicone Modification: Addition LSR/HTV high-temp crosslinker, inorganic filler surface coupler.
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Semiconductor/Electronic: CVD/ALD SiCN precursor, hydrophobic coating, optical anti-corrosion layer.
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New Energy: Li-battery electrolyte film-forming additive.
IOTA Technical Guide: N₂ Protect, Water-Free, Controlled Open
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Ring-Open Polymer: Monomer with 0.1-1% TFA or Karstedt Pt, toluene/cyclohexane solvent, 80-120℃ reflux; solvent strictly water-free (Na/K reflux), else Si-NH hydrolyzes to siloxane side-chain.
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Silicone Blend: Direct 0.5-3% into A (vinyl base gum), adjust B H-silicone ratio to compensate vinyl equiv; mix degas normal cure.
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Powder Mod: Powder 120℃ vacuum dewate, reflux with N3602 in toluene 80℃ 2-4h, filter dry → hydrophobic powder.
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Taboo Red Line: Si-NH extremely hydrolytic—whole process N₂/Ar, dried glassware, no tap-water/alcohol direct; avoid excess strong acid/oxidizer co-storage; unused material N₂-seal original drum, paraffin liquid seal; skin contact rinse water.
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Storage: 20kg PE/160kg iron/800kg IBC; cool (<30℃) dry ventilated dark; non-haz but moisture-sensitive, general chemical manage; drum N₂ blanket during transport.
Industry experts note that under PDC ceramic fiber (aero thermal protection/nuclear cladding), addition silicone "350℃+" high-temping, semiconductor SiCN barrier film, and solid-state Li-SEI engineering quadruple pull, cyclosilazane monomers are upgrading from "Gelest/Merck/KCC import followers" to "polysilazane synthesis reference cyclic monomer." IOTA N3602, with its "CAS 5162-63-0 + ≥95% + tetra-vinyl/tetra-methyl + ton-drum supply" hard metrics,
fills the domestic supply chain gap for tetravinyltetramethylcyclotetrasilazane in polysilazane precursor/ceramic-derivative/silicone high-temp crosslink fields, providing a mass-producible path to replace imported Gelest TVMCTS for downstream polysilazane plants, ceramic-precursor makers, and high-end silicone formulators. This confirms domestic cyclosilazanes are advancing steadily along "HMDS end-capper → octamethylcyclotetrasilazane → tetravinyltetramethyl functionalized," with growing technical say in Si-C-N ceramic and high-temp silicone key materials.
