Abstract
The objective of this paper is to present a new method of measuring oxygen diffusion coefficients with membrane-covered polarographic oxygen electrodes and to assess its applicability to viscous polymeric solutions of sodium carboxymethylcellulose (CMC), dextran and polyethylene glycol (PEG). The results indicate that, except in CMC solutions, the oxygen diffusion coefficient decreases with an increase in polymer concentration. In the CMC solutions, however, oxygen diffusion coefficients first decrease with an increased polymer concentration, then increase while the polymer concentration exceeds a critical value. Possible explanations for this phenomenon are explored.
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