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Phototransformation in Air

The half-life in the atmosphere has been estimated using the AOPWIN (TM) (v1.92) model and was 0.92 days.


MDI reacts with water to form predominantly inert polyurea. Yakabe et al (1994) found that for loadings of 400 - 10,000 mg/l, and under heterogeneous conditions, MDI had a half-life of ca. 20h at 25°C when the disappearance rate was fitted to a zero-order kinetic model. Howver the rate constant increased approximately linearly with the nominal concentration of PMDI for all constituents. For the two-ring constituents the rate constant was found to be 0.5h-1 for a loading of 1000 mg/L PMDI.