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Moisture and ion sorption in cellulose acetate
Author(s) -
Thomas Charles R.,
Barker R. E.
Publication year - 1963
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.1963.070070528
Subject(s) - cellulose acetate , aqueous solution , cellulose , sorption , chemistry , carboxymethyl cellulose , moisture , potassium , polymer , alkali metal , polymer chemistry , ionic bonding , inorganic chemistry , halide , sodium , organic chemistry , ion , adsorption
Measurements described in this paper show that the effective water permeation coefficients of silver paste electrodes on polymers such as cellulose acetate are of about the same magnitude as those of the polymer itself and, therefore, that such electrodes will have negligible effect on moisture penetration when conditioning periods of several hours or longer are used. X‐ray emission spectrography with K α radiation from chlorine and potassium was employed to determine the salt content of 0.267‐mm. cellulose acetate films (about 100 acetyl groups per polymer molecule = 40% acetyl), which were soaked for 48 hr. in aqueous solutions ranging up to 1 M in concentration of the alkali chlorides or potassium halides. Typically, the salt contents are about 100 ppm or 3 μmole/g. of cellulose acetate. The actual salt contents are discussed in relation to ionic hydration, and Stokes' radii via the differential hydration energy concept of Samoilov and the phenomenological developments of Nightingale. The evidence suggests that ionic motion in moisture‐swollen cellulose acetate is quite similar to that in aqueous solution.