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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
Author(s) -
Chang HsuHsien,
Beltsios Konstantinos,
Chen YihHang,
Lin DarJong,
Cheng LiaoPing
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.40374
Subject(s) - vinyl alcohol , materials science , microporous material , crystallization , membrane , chemical engineering , polymer chemistry , scanning electron microscope , porosity , phase (matter) , polymer , composite material , chemistry , organic chemistry , biochemistry , engineering
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.