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EC number: 918-919-9 | CAS number: -
For every experiment (temperature), three effusion cells were used simultaneously, with effusion orifices of approx. 0.8 mm in diameter, in platinum foil with a thickness of 12.5 m. More precise values for the areas, A0, and the transmission probability factors, w0, of the effusion orifices used are given in Table below:
Results obtained in the measurement of the vapour pressures of Phosphorothioyltris(oxybenzene-4,1-diylcarbamoyloxyethane-2,1-diyl) trisprop-2 -enoate.
Results to vapour pressure were determined using simplified Clapeyron-Clausius equation. Results can be determined for the temperature range from approx. 60 °C to 200 °C. Outside this temperature range, it is expected that the equation will progressively produce values that are higher than the real vapour pressure of the compound.
The vapour pressure of Phosphorothioyltris(oxybenzene-4,1-diylcarbamoyloxyethane-2,1-diyl) trisprop-2-enoate was measured using the Knudsen effusion method (mass-loss technique), according to the guidelines OECD 104 / EU A.4. The quality of the apparatus was previously verified with the measurement of well-known reference compounds.
Experiments were performed at three temperatures between 120 °C and 140 °C. Results permit the establishment of the relation between the vapour pressure of the compound and temperature, allowing the knowledge of the vapour pressure at different temperatures.
Based on the results, the vapour pressure of the compound is calculated as being equal to 3.2 x 10-6 Pa (3.2 x 10-8 mbar) at 20 °C, and 4.3 x 10-5 Pa (4.3 x 10-7 mbar) at 50 °C.
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