Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 121, Issue 3, Pages 1464-1468Publisher
WILEY
DOI: 10.1002/app.33670
Keywords
expanded polytetrafluoroethylene membrane; contact angle; surface tension; evaporation-induced stress
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Funding
- National High Technology Research and Development Program (863 Program) of China [2009AA034400]
- National Nature Science Foundation of China [50802072]
- Natural Science Foundation of Hubei Province of China [2008CDA038]
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The morphological changes of expanded polytetrafluoroethylene (ePTFE) membrane caused by solvent soakage were investigated in this study. The results demonstrated that the wettable solvent with low contact angle towards PTFE membrane can introduce huge stress to the ePTFE membrane and make the membrane shrinkage, and the stress is generated in the solvent evaporation procedure. The pore size and membrane dimension shrinkage of ePTFE membrane improved with the decrease of the solvent contact angle and surface tension. For ethanol and isopropanol with contact angle of 23 degrees and 20 degrees, the membrane thickness shrinkness are 15.0% and 16.7%, respectively. The evaporation-induced stress towards the ePTFE membrane also increases with the decrease of the solvent contact angle to the ePTFE membrane. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 121: 1464-1468, 2011
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