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Effect of temperature on gas permeation of polymer blends. II. Copolyester/copolyester–polyurethane

journal contribution
posted on 1990-08-05, 00:00 authored by Qipeng Guo, X Hechang, M Dezhu
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.

History

Journal

Journal of applied polymer science

Volume

40

Issue

3-4

Pagination

581 - 593

Publisher

John Wiley & Sons

Location

Chichester, Eng.

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

1990, John Wiley & Sons, Inc.

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