Hydrogen-Terminated Silicone Oil (H-PDMS)
شماره CAS: 70900-21-9
Hydrogen-terminated polydimethylsiloxane (H-PDMS) carries reactive Si-H groups exclusively at both chain ends, making it the preferred chain-extender and crosslinker in platinum-catalyzed addition-cure silicone rubber systems. Si-H content (0.03–0.5 wt%) and viscosity (2–1000 cSt) define reactivity: low-viscosity grades (2–10 cSt) act as crosslinkers; higher-viscosity grades (100–1000 cSt) serve as chain extenders and surface-treatment intermediates. Unlike side-chain hydride PDMS (PMHS), the terminal Si-H placement gives controlled network topology and predictable cure kinetics.
مشخصات فنی
| appearance | Colorless, clear liquid |
| viscosity (cSt, 25°C) | 2–1000 (multiple grades) |
| Si-H content (wt%) | 0.03–0.5 |
| refractive index (25°C) | 1.395–1.403 |
| density (g/mL, 25°C) | 0.94–0.96 |
حوزههای کاربرد
- Crosslinker and chain extender in Pt-catalyzed addition-cure silicone rubber (0.5–5 phr)
- Reactive intermediate for hydrosilylation synthesis of block copolymers
- Surface hydrophobization of precipitated silica and CaCO₃ fillers
- Synthesis of functional PDMS via hydrosilylation with allyl monomers
- Reactive diluent in UV/thermal dual-cure silicone coatings
ویژگیهای محصول
- Terminal Si-H placement gives controlled crosslink density vs. side-chain PMHS
- Broad viscosity range (2–1000 cSt) allows tuning of network topology and cure speed
- Reacts selectively with vinyl-terminated PDMS under Pt catalyst at room temperature
- Low-volatility high-viscosity grades (>100 cSt) reduce workplace exposure