Diethylphosphatoethyltriethoxysilane, known by its CAS number 757-44-8, is a complex organosilicon compound that plays a significant role in various industrial sectors, particularly in the synthesis of specialized silicone materials and as a functional additive. For chemical buyers and R&D scientists, understanding the detailed aspects of this chemical – from its molecular structure to its handling and applications – is crucial for effective procurement and utilization.

Decoding the Chemical Structure and Properties

The chemical name Diethylphosphatoethyltriethoxysilane succinctly describes its structure: a silane molecule with three ethoxy groups (-OCH2CH3) attached to the silicon atom, an ethyl chain connecting the silicon to a phosphate group, and two ethyl groups esterified to this phosphate. This structure confers specific reactivities. The triethoxysilyl group is susceptible to hydrolysis, releasing ethanol and forming silanol (Si-OH) groups, which then readily condense to form siloxane (Si-O-Si) networks. The diethylphosphato group, containing phosphorus bonded to oxygen and ethyl groups, contributes to the compound's polarity and potential interactions with various substrates or functional groups.

Key physical properties typically cited for Diethylphosphatoethyltriethoxysilane include it being a clear liquid with a density around 1.031 g/mL. It possesses a refractive index of approximately 1.4216 at 20°C and a boiling point of 141°C at 2 mmHg. Importantly, it is classified as moisture-sensitive, meaning it should be stored in tightly sealed containers under dry conditions to prevent premature hydrolysis and maintain its intended reactivity.

Industrial Significance and Applications

1. Intermediate for Silicone Synthesis: This compound serves as a vital intermediate in the production of specific silicone polymers and functional silicones. The ability to incorporate the phosphatoethyl moiety into a silicone backbone allows for the creation of silicones with enhanced properties such as improved flame retardancy, increased adhesion to polar surfaces, or unique catalytic activities. Manufacturers in the specialty silicone sector rely on such intermediates to achieve tailored product performance.

2. Surface Modification and Coupling Agent: The triethoxysilyl end of the molecule enables it to act as a coupling agent. When applied to inorganic surfaces (like glass fibers, silica nanoparticles, or metal oxides), it can form a robust chemical bridge between the inorganic material and an organic polymer matrix. This is critical in composite materials, where it improves the dispersion of fillers, enhances interfacial adhesion, and ultimately boosts the mechanical strength, durability, and environmental resistance of the composite product. It is also utilized in coatings and adhesives to promote better substrate adhesion.

3. Chemical Synthesis and Research: Diethylphosphatoethyltriethoxysilane is also employed in research laboratories and specialty chemical synthesis. Its reactive functional groups make it a useful building block for creating more complex organophosphorus and organosilicon compounds with specific properties for niche applications in electronics, pharmaceuticals, or advanced materials research.

Procurement Strategy for Diethylphosphatoethyltriethoxysilane

For businesses looking to purchase Diethylphosphatoethyltriethoxysilane, it is essential to partner with reliable chemical suppliers. Chinese manufacturers are a significant source for this specialty chemical, often offering competitive pricing and consistent quality. When making a purchase, buyers should always request detailed technical data sheets (TDS), safety data sheets (SDS), and certificates of analysis (CoA) to verify specifications and ensure safe handling. Understanding packaging options, minimum order quantities, and lead times is crucial for effective procurement planning. If you are looking to buy this compound, consulting with experienced suppliers can provide valuable insights into its application and sourcing.

In essence, Diethylphosphatoethyltriethoxysilane (CAS 757-44-8) is a highly functional specialty chemical with significant industrial relevance, particularly in the realm of advanced materials and silicone chemistry. Its unique structure and reactivity make it a valuable component for innovation and performance enhancement in various manufacturing processes.