Description
1,3-Bis(3-aminopropyl)tetramethyldisiloxane is a valuable diamino-functional siloxane monomer and modifier. Its unique combination of flexible siloxane backbone and reactive amine groups makes it essential for creating flexible, tough silicones, modifying epoxy resins, synthesizing siloxane-containing polymers (polyamides, polyimides), and enhancing adhesion in various materials applications. Its moisture sensitivity requires careful handling and storage.
Chemical Properties
Clear colorless to pale yellow liquid
Production Methods
A glass flask with a stirrer, reflux condenser, thermometer, and dropping funnel was charged with N, N-bis(trimethylsilyl)allylamine. A 4% isopropyl alcohol solution of H2 PtCl6.6H2 O. From the funnel, dimethyl ethoxy silane was added dropwise to the flask at 70° C. over 3 hours for hydrosilylation reaction. The reaction solution was ripened for one hour at the temperature. After adding ethanol and dodecylbenzenesulfonic acidd, the reaction solution was refluxed for 6 hours, completing the desilylation reaction. The reaction solution was transferred to a distillation apparatus where the ethanol and trimethyl ethoxy silane were distilled under atmospheric pressure. Water was added to the remainder, which was refluxed for 2 hours. Vacuum distillation was then carried out to collect 1,3-Bis(3-aminopropyl)tetramethyldisiloxane.
Reactivity Profile
1,3-Bis(3-aminopropyl)tetramethyldisiloxane participate in typical amine reactions: epoxy curing (forming crosslinks), isocyanate reactions (forming ureas), salt formation, Michael additions, condensation reactions, etc. The siloxane Si-O bonds can hydrolyze under acidic or basic conditions.
Flammability and Explosibility
Nonflammable
Safety Profile
Poison by intraperitoneal route. When heated to decomposition it emits toxic vapors of NOx.
