IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Chlorodifluoromethane with Polystyrene (PS)
Components:
   (1) Polystyrene (PS); ; [9003-53-6]  NIST Chemistry WebBook for detail
   (2) Chlorodifluoromethane; CHClF2; [74-45-6]  NIST Chemistry WebBook for detail
Evaluator:
   Yu. P. Yampol-skii, A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, April, 1994

 Critical Evaluation:
        The solubility coefficients measured at higher temperatures2 were recalculated to convert them into the same unite as in Ref. 3, i.e., (cm3(STP)/cm3 atm). Volumetric thermal expansion coefficients4 2X10-4 K-1 at T<Tg (•) and 6x10-4 K-1 at T>Tg (0) were used in the calculation. It is seen that the slopes of the linear dependence and, hence, the enthalpies of sorption change when passing from glassy to rubbery state of PS. The point reported by Durrill and Griskey was not included, tentatively, into the calculation. The enthalpies of sorption corresponding the glassy and rubbery states are equal to —34.2 and —15.4 kJ/mol, respectively.

FIG. 18.
The solubility of chlorofluoromethane (Freone 22) in PS was measured only in three papers.1-3. Barrie et al.3 studied this system using a gravimetric technique in the temperature range 293-333 K. At much higher temperatures, this system was investigated by means of inverse gas chromatography.2 The figure shows the temperature dependence T/K of the solubility coefficient S/(cm3(STP) g-1atm-1).

Experimental Data:   (Notes on the Nomenclature)

 View Figure 1 for this Evaluation

References: (Click a link to see its experimental data associated with the reference)
   1  P.L. Durill and R.G. Griskey, A.I.Ch.E. Journal 12, 1147-51 (1965).
   2  L.I. Stiel and D.F. Harnish, AI.Ch.E. Journal 22, 117-122 (1976).
   3  J.A. Barrie, M.J.L. Williams and K. Munday, Polym. Eng. Sci. 20, 21 (1980).
   4  Polymer Encyclopedia (in Russian) Vol. 3, p. 534 (Sov. Encyclo. Publishers, Moscow, 1977).