Diphenyldimethoxysilane CAS NO: 6843-66-9 QM-B31

Diphenyldimethoxysilane is an indispensable auxiliary agent in polypropylene (PP) production, industrially known as an “external donor.” In the Ziegler-Natta catalyst system used in PP synthesis, it works synergistically with internal electron donors (such as phthalates). By adjusting the electron cloud density and stereochemical environment of the catalyst’s active center, diphenyldimethoxysilane can significantly enhance the catalyst’s orientation to propylene monomers. This adjustment results in PP with extremely high isotacticity, often increasing it from around 90% to over 98%. High isotacticity PP exhibits higher crystallinity, melting point, and mechanical strength, and is widely used in the production of fibers, films, and high-performance engineering plastics.

As an important phenylsilane monomer, diphenyldimethoxysilane is a key raw material for synthesizing various phenyl organosilicon polymers. Through hydrolysis and polycondensation reactions, it can prepare high-performance materials such as phenyl silicone oil, phenyl silicone rubber, and phenyl silicone resin. Compared to ordinary organosilicon materials, the introduction of phenyl groups significantly improves the material’s properties. For example, its heat resistance and UV resistance are significantly enhanced, its glass transition temperature is increased, while maintaining excellent high and low temperature resistance and hydrophobicity. These modified materials are widely used in aerospace, electronics, automotive manufacturing, medical, and daily chemical industries, such as optical adhesives for LED packaging, sealants for high-temperature environments, and special lubricants.

Recent research on lithium-ion battery electrolytes has shown that diphenyldimethoxysilane also has potential application value in the field of lithium-ion batteries, serving as an electrolyte additive. During battery charging and discharging, lithium hexafluorophosphate (LiPF₆) in the electrolyte easily hydrolyzes to produce hydrofluoric acid (HF), which corrodes the electrodes and leads to battery capacity decay. The silicon-oxygen bonds in diphenyldimethoxysilane have strong electrophilicity and can preferentially react with HF to form silicon-fluorine bonds, thereby consuming HF and stabilizing the electrolyte system. Simultaneously, it can form a dense protective film (CEI layer) rich in silicon and fluorine on the positive electrode surface, inhibiting the oxidative decomposition of the electrolyte, thus effectively improving the cycle stability and safety of the battery.

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