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In the formulation design of addition-cure silicone rubber (LSR, RTV-2) and silicone gels, hardness, elongation at break, and modulus are key parameters that determine application boundaries. Traditional double-end or pendant hydride silicone oils often affect both crosslinking density and network structure simultaneously, offering a limited adjustment window. IOTA-611 Single-End Hydride Silicone Oil, with its unique "one inert end, one reactive end" molecular structure, provides a more precise and flexible solution for performance tuning of silicone rubber and gels.
IOTA-611 is a polydimethylsiloxane with an inert methyl group at one end and a dimethylsiloxy-terminated structure at the other. It has excellent compatibility with double-end and branched hydride silicone oils and can be used as a modifier for hardness, elongation at break, and modulus in addition-cure silicone rubber and silicone gels.
| Feature | Description |
|---|---|
| Single-End Reactive Design | One end has Si-H for crosslinking participation, the other end is inert – precise control over network structure |
| Good Compatibility | Excellent miscibility with double-end hydride, branched hydride, and pendant hydride silicone oils |
| Flexible Performance Adjustment | Adjusts hardness, modulus, and elongation of silicone rubber/gels by varying addition level |
| Customizable Molecular Weight | Adjustable within 850–3000 Da to meet different formulation needs |
| High Purity | Free chloride ion content <20 ppm, PDI <1.50 – good batch-to-batch stability |
| Parameter | Value |
|---|---|
| Appearance | Colorless to light yellow transparent liquid |
| Molecular Weight (Da) | 850 – 3000 |
| Polydispersity Index (PDI) | < 1.50 |
| Viscosity (25°C, mPa·s) | 5–40 |
| Free Chloride Ion Content (ppm) | < 20 |
| Application Area | Specific Use | Core Value |
|---|---|---|
| Addition-Cure Silicone Rubber (LSR/RTV-2) | Hardness modifier, modulus modifier | Reduces crosslinking density – increases softness or toughness |
| Silicone Gels | Elongation at break modifier | Controls gel softness and resilience – optimizes tactile feel |
| Two-Part Addition-Cure Systems | Used in combination with double-end hydride silicone oil | Fine-tunes crosslinking network – expands performance window |
The "single-end reactive" design of IOTA-611 allows it to act as a chain terminator in hydrosilylation reactions. It participates in the crosslinking network but does not introduce additional crosslinking branches. This means formulators can independently adjust hardness and elongation without changing crosslinking density, achieving performance combinations that were previously difficult to realize.
IOTA-611 – One end reactive, one end inert – opening a new dimension for silicone rubber and gel performance design.
