Effects of cooling temperature and aging treatment on the morphology of nano‐ and micro‐porous poly(ethylene‐co‐vinyl alcohol) membranes by thermal induced phase separation method |
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| Authors: | Hsu‐Hsien Chang Konstantinos Beltsios Yih‐Hang Chen Dar‐Jong Lin Liao‐Ping Cheng |
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| Affiliation: | 1. Department of Chemical and Materials Engineering, Tamkang University, New Taipei city, Taiwan;2. Department of Materials Science and Engineering, University of Ioannina, Ioannina, Greece;3. Energy and Opto‐Electronic Materials Research Center, Tamkang University, New Taipei city, Taiwan |
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| Abstract: | Poly(ethylene‐co‐vinyl alcohol) (EVOH 32) / 1,3‐propanediol mixtures are processed by thermally induced phase separation for the formation of porous membranes. The crystallization line was determined both by the cloud‐point and DSC methods. Two precursor solution compositions, four quench temperatures and various aging times were explored. It is found possible to generate both polymer‐crystallization controlled morphologies (for high quenches and/or sufficiently aged dopes), especially globular microporous ones, and novel nano‐scale porous morphologies dominated by intra‐binodal phase separation (for low quenches and limited or no precursor solution aging). Structural characterization of the membranes was accomplished via application of scanning electron microscopy and wide angle X‐ray diffraction. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40374. |
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| Keywords: | membranes crystallization ageing nanostructured polymers morphology |
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