Department of Polymer Science, Beijing Institute of Chemical Technology, Beijing, People's Republic of China.
Effect of temperature on gas permeation of polymer blends. II. Copolyester/copolyester–polyurethane
Article first published online: 10 MAR 2003
Copyright © 1990 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 40, Issue 3-4, pages 581–593, 5 - 20 August 1990
How to Cite
Qipeng, G., Hechang, X. and Dezhu, M. (1990), Effect of temperature on gas permeation of polymer blends. II. Copolyester/copolyester–polyurethane. J. Appl. Polym. Sci., 40: 581–593. doi: 10.1002/app.1990.070400323
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Accepted: 21 AUG 1989
- Manuscript Received: 17 JUN 1989
The transport behavior of H2, N2, CO2 was studied for blends of an aliphatic copolyester with a copolyester-polyurethane (PU) at various temperatures from 20 to 80°C. It was found that there was an abrupt change in slope near the melting point of the copolyester in Arrhenius plot of the permeability vs. temperature. This was considered to be due to the phase changes in the blends. The relationship between the logarithm of gas permeability and blend composition were only slightly dependent on temperature owing to the low degree of crystallinity of the copolyester; however, the activation energy of gas permeation for the blends had different values below and above the melting temperature of copolyester. The Tg measurements by DSC suggested that the copolyester/PU blends are miscible. However, the gas permeation measurements revealed the blends are not molecularly homegeneous. The miscibility of the blends did not extend to the angstrom level.