IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: Carbon dioxide with Polyimide Kapton H

Components:
   (1) Carbon dioxide; CO2; [124-38-9]  NIST Chemistry WebBook for detail
   (2) Polyimide Kapton H; ; [25036-53-7]  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:

        Sorption of carbon dioxide in poly(4,4’-oxydiphenylene pyromellitimide) known under trademark Kapton H was studied in a number of works.^1-6 The majority of researchers dealt with commercial samples of this material. Only Okamoto et al.⁵ investigated the specimens of this polymer prepared in the laboratory by imidization at different temperatures. The parameters of sotption isotherms obtained for this material differ from those measured for Kapton H. The table shows the selected dual mode sorption parameters for the system Kapton H—CO₂. It is seen that smooth temperature dependence is observed for all three model parameters and for the apparent solubility coefficient S.
     A larger scatter is observed for the affinity parameter b especially at lower temperatures. The enthalpies corresponding to van’t Hoff plots of k_D, b, and S are as follows: ΔH_D = —11.3 kJ/mol
ΔH_H = —11.9 kJ/mol ΔH_S = —25.1 kJ/mol.
     The Langmuir capacity parameters decrease with temperature. It is noteworthy that temperature dependence is strongly nonlinear, so it is difficult to determine the temperature at which C'_H vanishes. However, it is probably lower than the glass transition temperature of this polymer for which the values higher than 600 K^2,3 and even 780 K have been reported.

Experimental Data: (Notes on the Nomenclature)

Dual mode sorption parameters for the system Kapton H-CO₂
T/K	Henry's law constant, K	Langmuir's parameter, C_H	Affinity Coefficient b	Keunen coefficient, S [S = k_D – C'_Hb]	Reference
308	0.594	23.5	0.300	7.6	3
323	0.630	13.3	0.394	5.9	5
323	0.650	12.8	0.42	6.0	2
353	0.436	8.5	0.239	2.5	5
353	0.40	8.9	0.23	2.4	2
383	0.28	6.1	0.16	1.3	2
383	0.292	5.7	0.153	1.2	5

Notes:
^*  Units: k_D and S/cm^-3 atm^-1; C'_H/cm³(STP) cm^-3; b/atm^-1.

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

   1  R.T. Chern, W.J. Koros, B. Yui, H.B. Hopfenberger and V.T. Stannett, J. Polym. Sci., Polym. Phys. Ed. 22, 1061 (1984).
   2  K. Tanaka, H. Kita and K. Okamoto, Japan - US Polymer Symposium, p.249-250 (1985).
   3  T. Uragami, H.B. Hopfenberg, W.J. Koros, D.K. Yang, V.T. Stannett and R.T. Chern, J. Polym. Sci., Part B: Polym. Phys. 24, 779 (1986).
   4  K.C. O'Brian, W.J. Koros and G.R. Husk, Polym. Eng. Sci. 27, 211 (1987).
   5  K.I. Okamoto, K. Tanaka, O. Yokoshi and H. Kita, J. Polym. Sci., Part B: Polym. Phys. 27, 643-654 (1989).
   6  H. Hachisuka, Y. Tsujita, A. Takizawa and T. Kinoshita, Polymer J. 21, 681 (1989).