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EC number: 245-659-7
CAS number: 23432-62-4
Methyl-N-[3-(trimethoxysilyl)propyl]carbamate (CAS 23432-62-4) and its
hydrolysis product methyl-N-[3-(trihydroxysilyl)propyl]carbamate contain
no chromophores that would absorb visible or UV radiation, so direct
photolysis is not likely to be significant. Indirect photolysis
resulting from gas-phase reaction with photochemically-produced hydroxyl
radicals may occur.
The SRC AOPWIN program (v1.92) has been used to obtain values of the
rate constant kOH for reaction of
methyl-N-[3-(trimethoxysilyl)propyl]carbamate (CAS 23432-62-4) and its
hydrolysis product methyl-N-[3-(trihydroxysilyl)propyl]carbamate with
hydroxyl radicals. This prediction method has not been validated to
assess applicability to silanes and silanols, therefore, there is
uncertainty associated with the calculated values obtained.
The overall half-life in air under default conditions of hydroxyl
radical concentration was calculated using the following expressions:
kdegair(d-1) = kOH(cm3/molecule.
sec) x OH Concair(molecules/cm3) x 24 x 3600
DT50(d) = ln 2/ kdegair(d-1)
kdegair = total rate constant for degradation in air
kOH = rate constant for reaction with hydroxyl radicals
OH Concair = concentration of hydroxyl radicals in air = 5 x
105OH molecules/ cm3
DT50 = half-life
The results are given in table below:
Table 4.1.2 Results of photodegradation in air calculations
0.93 Days (24-hr day; 0.5E6 OH/cm3)
0.64 Days (24-hr day; 0.5E6 OH/cm3)
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