SDS Volume (4029)

Volume 70. Solubility of Gases in Glassy Polymers, p 1409

Original Measurements

O'Brien, K. C.; Koros, W. J.; Husk, G. R.; J. Membr. Sci. 35, 217 (1988).

Variables:

Room Temp: 308 $\pu{K}$
Pressure: 0.1 - 1.7 $\pu{MPa}$

Prepared by:

Yu.P. Yampol'skii

Method/Apparatus/Procedure:

Sorption measurements were carried out using a single transducer apparatus described in [1].

Source and Purity of Materials:

1. Matheson Gas precision mixture $\pu{50 \pm 0.5\%}$ each $\ce{CO2}/\ce{CH4}$.
2. PMDA-IPDA: polymerization performed in dimethylacetamide as $\pu{288-293 K}$ to form polyamic acid precursor according to standard procedure [2]. The polyamic acid solution was wet cast on a glass substrate heated for one hour at $\pu{353 K}$ under $\ce{Ar}$ to remove the solvent and then imidized by a two-step cure under vacuum (24 hr at $\pu{483 K}$ and four hours at $\pu{553 K}$). $T_{\rm{g}}$ was not reached even though the polymer was heated to $\pu{750 K}$. $\rho = \pu{1.285 g mL-1}$.

Estimated Errors:

Mass concentration (m/v) (1): Relative precision of solubilities: ±5%.

References

¹ Sanders, S. E.; Ph.D. Dissertation, North Carolina State University, Raleigh, NC, 1983.
² Sroog, C. E.; Endrey, A. L.; Abravio, S. V.; Berro, C. E.; Edwards, W. M.; Olivier, K. L.; J. Pol. Sci., Part A 3, 1373 (1965).