VIPS
Wacker
2931900090
Siwin-VIPS
15332-99-7
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Vinyltriisopropenoxysilane, cataloged as Siwin-VIPS under CAS No. 15332-99-7, is a dual-functional organosilane compound serving as a crosslinking agent and hydroxyl scavenger in condensation-cured silicone rubber systems. Its molecular architecture combines a vinyl group with three isopropenoxy groups attached to a central silicon atom, enabling it to participate in both crosslink formation and chain extension reactions within silicone polymer matrices.
The molecular formula C11H18O3Si reflects a silicon atom bonded to one vinyl group (-CH=CH2) and three isopropenoxy groups (-O-C(CH3)=CH2). The vinyl group provides reactivity toward hydrosilylation reactions, while the three isopropenoxy groups undergo hydrolysis in the presence of moisture to generate silanol groups that subsequently condense with hydroxyl-terminated polydimethylsiloxane polymers. This dual reactivity allows a single molecule to function simultaneously as a crosslink node and as a reactive site for further polymer chain growth.
Product No. | Siwin-VIPS |
|---|---|
Chemical Name: | Vinyltriisopropenoxysilane |
CAS NO. | 15332-99-7 |
Boiling point 760mmHg(℃) | 224.3 |
Flash point(℃) | 88.2 |
Formula | C11H18O3Si |
Appearance | Colorless Transparent Liquid |
Density (ρ20°C,g/cm3) | 0.926 |
Refractive Index () | 1.447 |
Purity (by GC, %) | 95min |
Chemical structure |  |
Siwin-VIPS functions as a crosslinking agent in room-temperature-vulcanizing (RTV) silicone rubber formulations. When exposed to atmospheric moisture, the isopropenoxy groups hydrolyze and condense with silanol-terminated polydimethylsiloxane polymers, forming a three-dimensional siloxane network that converts the liquid paste into an elastomeric solid. This curing mechanism supports both one-component and two-component RTV systems used in industrial sealing, electronic potting, and construction gasketing applications.
Beyond its crosslinking role, VIPS acts as a hydroxyl scavenger within silicone rubber compounds. It reacts with residual water and free silanol groups present in filler materials and polymer blends, consuming moisture that would otherwise trigger premature curing during storage. This scavenging action extends the shelf stability of one-component RTV sealant cartridges and prevents gelation in bulk storage drums, reducing material waste for commercial production facilities.
Vinyltriisopropenoxysilane serves as a silicon-based reagent in organic synthesis and as a chain extender in specialty polymer preparation. Its vinyl group can undergo hydrosilylation with Si-H containing compounds, while the isopropenoxy groups provide sites for alkoxy-terminated polymer synthesis. Formulators working on alkoxy-terminated base polymers for advanced sealant and adhesive systems incorporate VIPS as a building block to control molecular weight distribution and crosslink density.
Siwin-VIPS requires storage in sealed containers under dry, cool conditions away from direct sunlight and moisture sources. Exposure to humid air initiates hydrolysis of the isopropenoxy groups, leading to viscosity increase and reduced reactivity. Maintaining a nitrogen blanket in storage tanks is a standard practice among industrial users to preserve product integrity over extended periods.
200L PVF steel drum or on request. Custom packaging configurations can be arranged to accommodate specific batch sizes and material handling requirements of enterprise customers.
Vinyltriisopropenoxysilane serves primarily as a crosslinking agent for room-temperature-vulcanizing silicone rubber. It hydrolyzes in the presence of moisture and condenses with silanol-terminated polydimethylsiloxane polymers to form a cured elastomeric network.
VIPS acts as a hydroxyl scavenger, reacting with residual moisture and free silanol groups in fillers and polymer blends. This reaction consumes water that would otherwise cause premature curing during storage, extending the shelf life of formulated RTV products.
Siwin-VIPS has a minimum purity of 95% as measured by gas chromatography (GC). Each batch is tested against this specification to ensure consistent performance in commercial production environments.
Yes. Beyond silicone rubber crosslinking, VIPS finds use as a silicon-based reagent in organic synthesis, as a chain extender in polymer preparation, and as a building block for manufacturing alkoxy-terminated base polymers used in advanced adhesive and sealant systems.
