Evaluation of gas sorption parameters and prediction of sorption isotherms in glassy polymers

✍ Scribed by Jin-Sheng Wang; Yoshinori Kamiya

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 140 KB
• Volume: 38
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(20000315)38:6<883::aid-polb8>3.0.co;2-u

✦ Synopsis

A model of continuous-site distribution for gas sorption in glassy polymers is examined with sorption data of CO 2 and Ar in polycarbonate. A procedure is presented for determining from a measured isotherm the number of sorption sites in a polymer, an important parameter that previously had to be assumed. With this parameter value and solubility data obtained at zero pressure, the model can reasonably predict sorption isotherms of CO 2 in glassy polycarbonate for a wide temperature range. The number of sorption sites and the average site volume evaluated from CO 2 sorption isotherms are employed for the prediction of Ar sorption isotherms with zero-pressure solubility data and the independently measured partial molar volume of Ar. A reasonable fit to the measured isotherms of Ar is achieved. With the proposed procedure, the continuous-site model shows several advantages over the conventional dual-mode sorption model.