IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

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 Solubility System: Methane with Polycarbonate (PC)

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Components:
   (1) Polycarbonate (PC); ; [24936-68-3]  NIST Chemistry WebBook for detail
   (2) Methane; CH4; [74-28-8]  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:

        Four papers are available for the system polycarbonate—methane. Pope et al.⁴ studied history effects on sorption isotherms (unconditioned film, the film conditioned by exposure to high pressure carbon dioxide gas and exchange-conditioned by subsequent sweeping CO₂ by methane) and showed the significant changes in the isotherm’s shape caused by the pretreatment of a sample. On the other hand, the other papers^1-3 reported the dual mode sorption parameters but did not study the effects of different pretreatment of the films on the parameters of the sorption model.
     Below the solubility coefficients at 308 K are shown based on the dual mode sorption parameters^1-3 and by the initial slope of the isotherms.⁴
     In spite of possible different film history, the solubility coefficients lie within fairly narrow limits. Accordingly, sorption isotherms are given for the samples with different pretreatment.
These data indicate a possible range of variation of the solubility of CH₄ in polycarbonate at different pressures.

Experimental Data:   (Notes on the Nomenclature)

Keunen coefficient, S [cm3(STP)/cm3 atm]	Reference
0.85	1
0.84	2
0.99	3
0.54	4*
1.0	4**

Solubility of methane C/cm³(STP)cm^-3) in pC at 308 K and different pressures

Solubility [cm**3(STP)/cm**3]	Solubility Note	Remark(s)
3.2	Ref. 1	Ref. 4 2.5 cm**3(STP)/cm**3 (A) ; 5.0 cm**3(STP)/cm**3 (B)
5.3	Ref. 1	Ref. 4 2.5 cm**3(STP)/cm**3 (A) ; 5.0 cm**3(STP)/cm**3 (B)
8.2	Ref. 1	Ref. 4 4.3 cm**3(STP)/cm**3 (A) ; 8.2 cm**3(STP)/cm**3 (B)
10.4	Ref. 1	Ref. 4 4.3 cm**3(STP)/cm**3 (A) ; 8.2 cm**3(STP)/cm**3 (B)
3.3	Ref. 2	Ref. 4 6.8 cm**3(STP)/cm**3 (A) ; 13.0 cm**3(STP)/cm**3 (B)
5.6	Ref. 2	Ref. 4 6.8 cm**3(STP)/cm**3 (A) ; 13.0 cm**3(STP)/cm**3 (B)
9.5	Ref. 2	Ref. 4 8.2 cm**3(STP)/cm**3 (A) ; 15.7cm**3(STP)/cm**3 (B)
12.9	Ref. 2	Ref. 4 8.2 cm**3(STP)/cm**3 (A) ; 15.7cm**3(STP)/cm**3 (B)

Notes:
Table 1^*  Unconditioned film.
Table 1^**  Exchange-conditioned film.
Table 2^A  Unconditioned film.
Table 2^B  Exchange-conditioned film.

References: (Click a link to see its experimental data associated with the reference)

   1  W.J. Koros, A.H. Chan and D.R. Paul, J. Membr. Sci. 2, 165 (1977).
   2  E. Sada, H. Kumazawa, H. Yakushiji, Y. Bamba, K. Sakata and S.-T. Wang, Ind. Eng. Chem., Res. 26, 433-438 (1987).
   3  T.A. Barbari, W.J. Koros and D.R. Paul, J. Polym. Sci., Part B: Polym. Phys. 26, 729-744 (1988).
   4  D.S. Pope, G.K. Feming and W.J. Koros, Macromolecules 23, 2988 (1990).

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Last updated: February 18, 2015 (Created: August 17, 2007)