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Sorption and desorption of tetrachloroethylene in fluoropolymers: Effects of the chemical structure and crystallinity
Author(s) -
Hedenqvist M. S.,
Ritums J. E.,
CondéBrana M.,
Bergman G.
Publication year - 2002
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.11645
Subject(s) - crystallinity , solubility , polymer , tetrachloroethylene , thermal diffusivity , sorption , chemical engineering , materials science , polymer chemistry , hildebrand solubility parameter , nonane , chemistry , thermodynamics , organic chemistry , composite material , adsorption , trichloroethylene , physics , engineering
In 18 fluoropolymers with different repeating‐unit structures and crystallinities, the solubility, diffusivity, and permeability at 70°C of a polarizable nonpolar solute (tetrachloroethylene) were studied. The transport properties were mostly controlled by the polarity of the polymer and to a lesser degree by the polymer crystallinity. The highest permeability was observed in the dipole‐containing ethylene–chlorotrifluoroethylenes because of their high tetrachloroethylene solubility. The lowest permeability was observed in the hydrogen‐bonding poly(vinylidene fluoride) polymers because of the combination of low solute solubility and solute diffusivity. The tetrachloroethylene diffusivity was solute‐concentration‐dependent, and sorption curves were S‐shaped, indicating that the solute surface concentration was time‐dependent. The rate at which the surface concentration approached the saturation level was proportional to the product of Young's modulus, the square of the thickness of the dry polymer, and the logarithm of the solute diffusivity. Data for the water‐hyperbranched polymer and limonene–polyethylene conformed to the same relationship. Therefore, this provides a new tool for predicting the solute‐surface‐concentration time dependence from data obtained by independent measurements. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1474–1483, 2003