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Effect of casting solvents on the morphology and properties of styrene‐butadiene‐styrene triblock copolymer membranes
Author(s) -
Yang JenMing,
Hsiue GingHo,
Chen HsinLung
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10429
Subject(s) - copolymer , membrane , materials science , styrene , solvent , polymer chemistry , casting , miscibility , tetrahydrofuran , chemical engineering , morphology (biology) , composite material , organic chemistry , polymer , chemistry , biochemistry , biology , engineering , genetics
The effect of the casting solvents on the morphology and properties of styrene‐butadiene‐styrene (SBS) triblock copolymer membranes has been investigated. The SBS membranes were prepared by both dry and wet processes. The stress relaxation of the membranes prepared by the dry process was studied. It was found that the stress relaxation of the membrane prepared from tetrahydrofuran (THF) proceeded faster than that of the membrane prepared from the mixed solvent of THF and heptane. This phenomenon could be ascribed to the different membrane morphologies created by the two solvent systems. Three different SBS membrane structures were obtained from three different casting solvents. The results were interpreted based on the miscibility between the solvent and the nonsolvent.