Aging of Polyimides in High Temperature Environments |
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| Authors: | Jan U Wieneke Claudia Staudt |
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| Institution: | Department of Organic and Macromolecular Chemistry, Heinrich-Heine-University, Universitätsstr. 1, 40225 Düsseldorf, Germany |
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| Abstract: | Summary: Membranes made of high permeable fluorinated aromatic polyimide synthesized from 6FDA (4,4'-hexafluoroisopropylidene diphthalic anhydride) and 4MPD (2,3,5,6-tetramethyl-1,4-phenylene diamine) have been thermally treated to examine their aging behaviour at high temperature. The aging process was investigated by means of gas permeation tests, IR spectroscopy and thermogravimetric analysis combined with mass spectral analysis of the gaseous decomposition products. Up to around 400 °C thin films of the material show no major degradation but changes in color, flexibility and separation characteristics for O2/N2 were observed. |
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| Keywords: | aging degradation gas permeation membranes polyimides |
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