Vitrification phenomena in polysulfone/NMP/water system

The vitrification line for the ternary system of polysulfone (PSf)/N-methyl 2-pyrrolidinone (NMP)/water was determined by differential scanning calorimeter (DSC) measurements with varying compositions. Pure PSf showed both alpha- and beta-transition temperatures (T-g,T-alpha = 187.5 degrees C, T-g,T-beta = -21.4 degrees C). The T-g,T-alpha of PSf decreased with increasing solvent concentration. The T-g,T-alpha of PSf decreased linearly with the addition of NMP in the concentration range of 70-90 wt % polymer. The vitrification line was indicated in the phase diagram for the ternary system of PSf/NMP/water at 15 and 60 degrees C. As the temperature is increased, a high polymer concentration was needed to reach the vitrification condition. The vitrification composition of the polymer in the binary system of PSf and NMP was 72.0 wt % at 15 degrees C and 79.8 wt % at 60 degrees C. We also found that the slope of the vitrification line changed with the temperature and that a small amount of water (10-20 wt %) can induce the vitrification of the polymer solution in the PSf/NMP/water system at 15 degrees C. (C) 1999 John Wiley & Sons, Inc.
Publisher
John Wiley & Sons Inc.
Issue Date
1998-06
Language
ENG
Keywords

PHASE-SEPARATION PHENOMENA; MEMBRANE FORMATION; POLYMER-SOLUTIONS; GLASS-TRANSITION; GELATION; MIXTURES

Citation

JOURNAL OF APPLIED POLYMER SCIENCE, v.71, no.3, pp.431 - 438

ISSN
0021-8995
URI
http://hdl.handle.net/10203/2124
Appears in Collection
CBE-Journal Papers(저널논문)
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