Property | Value |
Systematic Name | 1,3-Diphenyl-1,1,3,3-tetramethyldisiloxane |
Common Name | 1,1,3,3-Tetramethyl-1,3-diphenyldisiloxane |
CAS Number | 56-33-7 |
Molecular Formula | C₁₆H₂₂OSi₂ |
Molecular Weight | 286.52 g/mol |
Appearance | Colorless to almost colorless clear liquid |
Physical State | Liquid |
Melting Point | -89 °C |
Boiling Point | 155-158 °C at 13 mm Hg |
Density (Specific Gravity) | 0.976 g/cm³ (20/20 °C) |
Flash Point | 156 °C |
Solubility | Insoluble in water |
Description of 1,3-Diphenyl-1,1,3,3-tetramethyldisiloxane
1,3-Diphenyl-1,1,3,3-tetramethyldisiloxane (CAS: 56-33-7), commonly known as sym-tetramethyldiphenyldisiloxane. This versatile siloxane serves as a chain terminator in silicone polymer synthesis, enhancing flexibility and thermal stability in sealants, adhesives, and lubricants. It also acts as a protecting group in organic synthesis and a reference standard in NMR spectroscopy.
Application of 1,3-Diphenyl-1,1,3,3-tetramethyldisiloxane
1,3-Diphenyl-1,1,3,3-tetramethyldisiloxane (MMDP), a versatile organosilicon intermediate, is widely used in the synthesis of specialty silicone polymers and resins, enhancing thermal stability, mechanical strength, and flexibility in sealants, adhesives, and coatings for automotive, aerospace, and electronics applications. As a crosslinking agent, it improves tensile strength and abrasion resistance in silicone rubber, while serving as a curing agent for epoxy resins in composites and high-performance coatings. In electronics, MMDP acts as a surface modifier and dopant for semiconductors and photovoltaic cells, boosting electrical conductivity and optical clarity in encapsulants and displays. Additional roles include high-temperature lubricants, surfactants in personal care products, and anti-foaming agents in industrial fluids.
Storage of 1,3-Diphenyl-1,1,3,3-tetramethyldisiloxane
It should be kept in a cool, dry, well-ventilated area at room temperature or below 15°C, away from heat, ignition sources, and oxidizing agents. Keep the container tightly closed to prevent moisture absorption and vapor escape. For extended stability, refrigerate at 2-8°C in a dark place. Use compatible materials for storage. Handle under good ventilation to minimize exposure.
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