AbstractMeasurements 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 withKα 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 1Min 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 s
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