IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Methane, Copoly(pyromellitic dianhydride-oxydianiline) PMDA (polyimide Kapton H)

Components:
   (1) Carbon dioxide with Methane; CO2, CH4; [124-38-9, 74-82-8]  NIST Chemistry WebBook for detail
   (2) Copoly(pyromellitic dianhydride-oxydianiline) PMDA-ODA (polyimide Kapton H); ; [25036-53-7]  NIST Chemistry WebBook for detail

Original Measurements:
   K.C. O'Brian, W.J. Koros and G.R. Husk, J. Membr. Sci. 35, 217 (1988).

Variables:
   Temperature = 308 K
   Pressure = 0.1-1.4 MPa

Prepared By:
   Yu. P. Yampol'skii

Experimental Data:   (Subscripts 1,2,3, ..., in column headings refer to components 1,2,3, ...)

Sorption isotherms of carbon dioxide and methane in PMDA-ODA at 308 K (The original data were represented graphically)
Chemical Name	Pressure [MPa]	Sorption [(V₁(STP)/V₂)]
CO2	0.16	14.36
CO2	0.36	22.17
CO2	0.52	26.96
CO2	0.76	32.12
CO2	0.98	36.22
CO2	1.37	42.11
CH4	0.21	3.21
CH4	0.31	4.46
CH4	0.47	5.84
CH4	0.71	7.36
CH4	0.91	8.61
CH4	1.00	9.07
CH4	1.12	9.80

Method/Apparatus/Procedure:
   Sorption measurements were carried out using a single transducer apparatus described in Ref. 1.

Source and Purity of Materials:
   PMDA-ODA: polymerization performed in dimethylacetamide at 288—293 K to form polyamic acid precursor according to standard proccdure.2 The polyamic acid solution was wet cast on a glass substrate heated for 1 h at 353 K under Ar to remove the solvent and then imidized by a two-step cure under vacuum (24 h at 483 K and 4 h at 553 K). The polymer studied did not reveal a glass transaction temperature at temperatures up to 750 K. Density was 1.402 g/cm³.

Estimated Errors:
   Solubility: Relative precision of solubilities: 5%.

References:
   ¹S. E. Sanders, Ph.D. dissertation, NC State University, 1983.
   ²C. H. Scroog, A. L. Endrey, S. V. Abravio, C. E. Berro, W. M. Edwards, and K. L. Olivier, J. Pol. Sci., Part A 3, 1373 (1965).