Registration Dossier
Registration Dossier
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EC number: 236-818-1 | CAS number: 13497-18-2
Endpoint summary
Administrative data
Description of key information
- Concentration of the silanol; the greater the initial concentration, the greater the degree of condensation. Significant condensation is not expected at concentrations less than approximately 100 mg/l, but is dependent on specific conditions.
- pH; the condensation reaction may be either acid or base catalysed.
- Temperature.
- Other species present.
- The nature of the R group
- The number of Si-OH groups; silanetriols condense more rapidly than silanediols.
Physicochemical properties
3-(Triethoxysilyl)-N-[3-(triethoxysilyl)propyl]-1-propanamine is a liquid at standard temperature and pressure. A glass transition occurs at approximately -120°C and the boiling point is 358°C. It has a predicted density of 1.01 g/cm3 at 20°C and a predicted vapour pressure of 1.8E-04 Pa at 25°C.
The substance is classified as a non-flammable liquid on the basis of the boiling point and a measured flash point of 95°C. It is not pyrophoric or flammable in contact with water. It has a measured self-ignition temperature of 255°C, and is not explosive and not oxidising on the basis of chemical structure. It is not surface active.
The hydrolysis half-life time of 3-(triethoxysilyl)-N-[3-(triethoxysilyl)propyl]-1-propanamine is 66.2 hours at 25°C and pH 7. It is not predicted to be surface active. It has a predicted low water solubility (23 mg/l), a predicted log Kow of 3.1 and a predicted vapour pressure of 1.8E-04 Pa at 25°C.
3-(Triethoxysilyl)-N-[3-(triethoxysilyl)propyl]-1-propanamine produces a silanol hydrolysis product
3-(trihydroxysilyl)-N-[3-(hydroxysilyl)propyl]-1-propanamine and ethanol according to the following equation:
[(CH3CH2O)3Si(CH2)3]2NH + 6H2O → [(HO)3Si(CH2)3]2NH + 6CH3CH2OH
The silanol hydrolysis product is predicted to be very soluble in water at 20-25°C (1E+06 mg/l) and has a predicted log Kow of -4.0. It is less volatile than the parent substance with a vapour pressure of 2.2E-010 Pa at 25°C (predicted).
Ethanol is miscible with water, has low log Kow (-0.3) and high vapour pressure (7910 Pa at 25°C) (Daubert, T E and Danner R P, 1985).
Silanetriols may undergo condensation reactions to give siloxane dimers, oligomers and polymers, according to the scheme:
RSi(OH)3 ⇄ RSi(OH)2OSi(OH)2R ⇄ RSi(OH)2O[Si(R)(OH)O]nSi(OH)2R
(where R is an alkyl or aryl side-chain)
A highly cross-linked gel may form. The degree of condensation that will occur may vary with:
Additional information
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