Methyldisilazane
Overview
Methyldisilazane is an organosilicon compound primarily used in high-tech industries due to its ability to modify surfaces and act as a reactive intermediate. Its trimethylsilyl groups make it highly effective for creating water-repellent layers and facilitating chemical vapor deposition (CVD) processes. As a derivative of ammonia, it reacts vigorously with water and acids, requiring careful handling. Industrial-grade methyldisilazane typically has a purity of 98% or higher, with impurities like chlorides or metals tightly controlled for electronics applications.
Physical and Chemical Properties
The compound is a volatile liquid with a pungent odor, boiling at 125–126°C. Its low density (0.774 g/cm³) and solubility in non-polar solvents like hexane make it suitable for solution-based processes. The Si-N bonds are hydrolytically unstable, reacting with moisture to form silanols and ammonia. Key reactivity includes its use as a silylating agent, transferring trimethylsilyl groups to hydroxyl or carboxyl functionalities. This property is exploited in pharmaceuticals and surface modification, where it enhances hydrophobicity or alters surface energy.
Main Applications
In semiconductor fabrication, methyldisilazane serves as a passivation layer precursor, protecting silicon wafers from oxidation. It is also critical in producing low-k dielectric films for advanced microelectronics. Other uses include textile treatments for water repellency and as a coupling agent in composite materials. In laboratories, it derivatizes polar compounds for gas chromatography analysis by masking active hydrogens.
Safety and Storage
Due to its flammability and corrosivity, methyldisilazane requires storage in sealed containers under inert gas. Leaks can release toxic ammonia vapors, necessitating ventilation and spill kits with inert absorbents like sand. Personal protective equipment (PPE) such as nitrile gloves, goggles, and flame-resistant lab coats is mandatory. First aid measures include flushing eyes/skin with water for 15 minutes and seeking immediate medical attention for inhalation exposure.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-specific COAs (Certificates of Analysis). Key parameters to test include purity (via GC), residual solvents, and trace metals (e.g., <1 ppm for Fe, Na). Bulk orders (drum quantities) commonly offer cost savings, but ensure nitrogen-purged packaging to prevent degradation. For global procurement, verify compliance with regional regulations like REACH or TSCA.
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