2-Cyanoethyltrichlorosilane

Updated: 2026-09-15

Overview

2-Cyanoethyltrichlorosilane is an organosilicon compound with dual functionality: a reactive trichlorosilyl group and a cyanoethyl moiety. It is primarily employed as a coupling agent to enhance adhesion between inorganic surfaces (e.g., glass, metals) and organic polymers. The compound’s reactivity with hydroxyl groups makes it suitable for surface modification in coatings, composites, and electronics. Industrially, it is synthesized via hydrosilylation or chlorination routes. Due to its moisture sensitivity, handling requires anhydrous conditions. Its applications span niche sectors like aerospace, microelectronics, and specialty coatings, where interfacial bonding is critical.

Physical and Chemical Properties

The liquid exhibits a density of ~1.32 g/cm³ and decomposes near 200°C, precluding a clear boiling point. It reacts violently with water, releasing hydrogen chloride (HCl), and is soluble in hydrocarbons, ethers, and chlorinated solvents. The cyanoethyl group contributes polarity, while the trichlorosilyl group drives hydrolysis and condensation reactions. Key hazards include corrosivity and HCl emission, necessitating storage under nitrogen or argon. Its IR and NMR spectra show characteristic peaks for Si-Cl (600 cm⁻¹) and C≡N (2250 cm⁻¹). Stability is compromised by prolonged exposure to humidity or high temperatures.

Main Applications

1. **Adhesion Promotion**: Bonds glass fibers to epoxy resins in composites, improving mechanical strength. 2. **Surface Modification**: Anchors to metal oxides (e.g., SiO₂, Al₂O₃) for hydrophobic or functionalized coatings. 3. **Polymer Synthesis**: Serves as a monomer or crosslinker in silicones and acrylonitrile-based polymers. 4. **Electronics**: Enhances dielectric properties in semiconductor passivation layers. Specialty applications include optical fibers and biomedical devices, where precise surface engineering is paramount. Its use is often proprietary, tailored to specific formulations.

Safety and Storage

Handling requires gloves, goggles, and fume hoods due to corrosive and toxic hazards. Spills should be neutralized with sodium bicarbonate and contained with inert absorbents. Storage mandates sealed, dry containers under inert gas, away from oxidizers and moisture. Transport regulations classify it as Class 8 (corrosive). Disposal must follow local chemical waste protocols, avoiding aqueous release. First aid for exposure includes flushing eyes/skin with water and seeking medical attention for inhalation.

B2B Procurement Guide

Buyers should prioritize suppliers with ISO 9001 certification and batch-specific COAs (Certificates of Analysis). Key parameters include purity (≥95%), residual solvent levels, and packaging integrity (ampoules or nitrogen-purged drums). Bulk orders (25+ kg) may attract discounts, but verify lead times due to limited production scales. Regional regulations (e.g., REACH, TSCA) may require SDS and import permits. Sample testing for reactivity and compatibility is advised before large-scale procurement.