A method of moments for measuring diffusivities of gases in polymers

✍ Scribed by R. M. Felder; C-C Ma; J. K. Ferrell

• Publisher: American Institute of Chemical Engineers
• Year: 1976
• Tongue: English
• Weight: 722 KB
• Volume: 22
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690220414

✦ Synopsis

Abstract

A method of moments has been formulated for the determination of the diffusivity of a gas in a polymer from a step response in a continuous permeation chamber. Contributions of system components other than the polymer are easily factored out to determine the contribution of the polymer alone, and this contribution is then analyzed to calculate the diffusivity. The method has been applied to the measurement of the diffusivities of sulfur dioxide in PTFE (Teflon) and fluorosilicone rubber tubes over a wide temperature range.