Reaction mass of Phosphorous(1+), (N-ethylethanaminato) diphenyl(phenylmethyl)-(T-4)-salt with 4, 4' - [2,2,2-trifluoro-1-(trifluoromethyl) ethylidene bis[phenol] (1:1) and (4,4'-[2,2,2-Trifluoro-1-(trifluoromethyl)ethylidene]diphenol

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

not applicable

GLP compliance:

no

Type of method:

effusion method: isothermal thermogravimetry

Key result

Test no.:

#1

Temp.:

23 °C

Vapour pressure:

0.004 Torr

The vapour pressures (Pv) in function of temperature have been found in the literature for FC 43 (4) and DBS (5) and reported versus v defined as: v = ( dm) /dt (T / MA)1//2 where dm (in g/(min m2)) is the rate of mass loss per unit area, T is absolute dt temperature (in K) and MA is molecular weight of substance (in g/mol). We make the assumption that the unit area is constant in all our experiment (similar sample volume). According to reference 1, a plot of Pv vs v should be linear: Pv = k v. Assuming surface area to be constant, dm/dt is simply the absolute value of derivative of TGA curve and the surface area is comprised in constant k. The linear correlation is very good (R2=0.9985) and the slope is k= 21.816. Using this slope we obtain Pv for the test itemand simply using the Pv=k v relation for the different temperatures, in our case in the range 100-170 °C where weight loss is measurable and outside the 23-90 °C region where a maximum of weight loss derivative is present in correspondence of eutectic formation. The temperature dependence of Pv can be described by the Clausius-Clapeyron equation, so a plot of ln(Pv) vs 1/T should give a straight line with slope delta H/T, with delta H heat of sublimation for solid or heat of vaporization for liquid. The linear correlation is acceptable (R2=0.95). By extrapolation of the straight line we obtained a value of Pv = 4 10-3 torr at 23°C.

Conclusions:

The estimation of the vapour pressure is 4 x 10-3 torr at 23°C.

Executive summary:

The estimation of the vapour pressure is 4 x10-3 torr at 23°C.

Description of key information

The estimation of the vapour pressure is 4 x10-3 torr at 23°C.

Key value for chemical safety assessment

Vapour pressure:

0.5 Pa

at the temperature of:

23 °C