Relaxation phenomena in dense, glassy membranes prepared from a polymer solution, monitored by changes in dielectric properties

R.H.B. Bouma, Anthonie van den Boomgaard, C.A. Smolders, H. Strathmann, P.F. Mijnlieff

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Abstract

The drying of a solvent-cast polymer film is monitored in a non-invasive way, by measuring the changes in time of dielectric properties, using interdigitated or comb electrodes. Experimentally, the vitrification of the polymer solution is observed at a distinct time, followed by the slow evaporation of solvent from the glassy state. As the solvent diffusion coefficient is a strong function of the concentration in the polymer film, removal of residual solvent proceeds at a self-decreasing rate. With a simple model, solvent mass transfer coefficients in the glassy state are determined from the experiments. It is shown that volume relaxation may be slow compared to the drying process, when preparing thin solvent-cast membranes and using solvents that diffuse relatively fast through the glassy polymer film.
Original languageEnglish
Pages (from-to)205-221
Number of pages17
JournalJournal of membrane science
Volume113
Issue number2
DOIs
Publication statusPublished - 1996

Fingerprint

Polymer solutions
Dielectric properties
dielectric properties
Polymers
membranes
Membranes
polymers
Polymer films
drying
casts
Drying
Vitrification
vitrification
Comb and Wattles
mass transfer
Electrodes
Evaporation
Mass transfer
diffusion coefficient
evaporation

Keywords

  • METIS-106171
  • IR-11454

Cite this

Bouma, R.H.B. ; van den Boomgaard, Anthonie ; Smolders, C.A. ; Strathmann, H. ; Mijnlieff, P.F. / Relaxation phenomena in dense, glassy membranes prepared from a polymer solution, monitored by changes in dielectric properties. In: Journal of membrane science. 1996 ; Vol. 113, No. 2. pp. 205-221.
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Relaxation phenomena in dense, glassy membranes prepared from a polymer solution, monitored by changes in dielectric properties. / Bouma, R.H.B.; van den Boomgaard, Anthonie; Smolders, C.A.; Strathmann, H.; Mijnlieff, P.F.

In: Journal of membrane science, Vol. 113, No. 2, 1996, p. 205-221.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Relaxation phenomena in dense, glassy membranes prepared from a polymer solution, monitored by changes in dielectric properties

AU - Bouma, R.H.B.

AU - van den Boomgaard, Anthonie

AU - Smolders, C.A.

AU - Strathmann, H.

AU - Mijnlieff, P.F.

PY - 1996

Y1 - 1996

N2 - The drying of a solvent-cast polymer film is monitored in a non-invasive way, by measuring the changes in time of dielectric properties, using interdigitated or comb electrodes. Experimentally, the vitrification of the polymer solution is observed at a distinct time, followed by the slow evaporation of solvent from the glassy state. As the solvent diffusion coefficient is a strong function of the concentration in the polymer film, removal of residual solvent proceeds at a self-decreasing rate. With a simple model, solvent mass transfer coefficients in the glassy state are determined from the experiments. It is shown that volume relaxation may be slow compared to the drying process, when preparing thin solvent-cast membranes and using solvents that diffuse relatively fast through the glassy polymer film.

AB - The drying of a solvent-cast polymer film is monitored in a non-invasive way, by measuring the changes in time of dielectric properties, using interdigitated or comb electrodes. Experimentally, the vitrification of the polymer solution is observed at a distinct time, followed by the slow evaporation of solvent from the glassy state. As the solvent diffusion coefficient is a strong function of the concentration in the polymer film, removal of residual solvent proceeds at a self-decreasing rate. With a simple model, solvent mass transfer coefficients in the glassy state are determined from the experiments. It is shown that volume relaxation may be slow compared to the drying process, when preparing thin solvent-cast membranes and using solvents that diffuse relatively fast through the glassy polymer film.

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KW - IR-11454

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DO - 10.1016/0376-7388(95)00028-3

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