Vinyl Terminated Polydimethylsiloxane
Vinyl Terminated Polydimethylsiloxane is formally named α,ω-divinyl polydimethylsiloxane, a linear difunctional addition-curable silicone base polymer with polydimethylsiloxane backbone and reactive vinyl carbon-carbon double bonds bonded at both terminals。
Vinyl Terminated Polydimethylsiloxane
Vinyl Terminated Polydimethylsiloxane
CAS No.: 68083-19-2
Chemical Structure: \(\mathrm{CH_2=CH-Si(CH_3)_2O-[Si(CH_3)_2O]_n-Si(CH_3)_2-CH=CH_2}\)
Appearance: Colorless, impurity-free transparent homogeneous liquid
Vinyl Content: Adjustable from 0.03 to 3.0 mmol/g, varies with molecular weight
Density (25℃): 0.965–0.98 g/cm³
Refractive Index (20℃): 1.405–1.412
Flash Point: Above 140℃, low volatility
Volatile Content (150℃, 3h): ≤1.0%
Freezing Point: ＜-60℃, excellent low-temperature fluidity
Storage Requirements
Store in tightly sealed light-shielded containers at 2–25℃; high-viscosity grades are recommended for nitrogen-sealed packaging.
Do not co-store with platinum catalysts, Si-H silicones, peroxides or strong oxidants to prevent premature crosslinking and gelation.
Keep packaging fully airtight against moisture and dust; standard shelf life is 12 months.
Separate from high-temperature heat sources and open flames, maintain well-ventilated and dry warehouse environment.
Viscosity (25℃): 850-1150cSt
Custom specifications are available upon customer request
Base polymer for addition-cure liquid silicone rubber (LSR): Raw material for injection molding food-grade and medical silicone elastomers with zero small molecule precipitation during curing.
Modifying matrix for high-temperature vulcanized silicone rubber (HTV): Adjust material fluidity and improve tensile & tear strength of finished parts.
Optical transparent gel & electronic LED potting compound: High light transmittance, low stress, thermal shock resistant insulating encapsulant.
Synthetic intermediate for silicone-modified acrylic & polyurethane: Graft copolymerize with Si-H acrylic/PU to produce weather-resistant smooth coatings and inks.
Raw material for precision molds & transparent silicone parts: Anti-yellowing, high resilience and low shrinkage for optical and jewelry molds.
Medical-grade silicone gel & cushion materials: Good biocompatibility for medical dressings and instrument filling buffers.
UV addition-curable silicone coatings & release agents: Crosslink with Si-H silicones without silicone migration, suitable for optical films.
Substrate for thermal conductive silicone pads: Compound with thermal conductive fillers to fabricate high thermal conductivity insulating elastic sheets.
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