Effects of CO2 conditioning on sorption, dilation, and transport properties of polysulfone

✍ Scribed by Jin-Sheng Wang; Yoshinori Kamiya; Yasutoshi Naito

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 187 KB
• Volume: 36
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(19980730)36:10<1695::aid-polb10>3.0.co;2-4

✦ Synopsis

Sorption, dilation, and diffusion behaviors were studied for the system of polysulfone/CO 2 with regard to the effects of CO 2 conditioning, i.e., exposure to highpressure CO 2 . Concurrent measurements of solubility, dilation, and diffusivity were performed for polysulfone films before and after the conditioning at 25 and 50 atm. While the solubility and dilation were enhanced by the conditioning, the diffusivity appeared to be depressed. Results were analyzed on the basis of the dual-mode sorption model, with the assumption that the Henry's law dissolution was not affected by the conditioning. Consistent description was achieved then by attributing the changes to increased amount of Langmuir adsorption. The conditioning effect on the diffusivity, which had not been reported before based on CO 2 sorption kinetics, suggests that the permeability of glassy polymers would not always be enhanced by the conditioning, but may also be decreased.