The measurement of oxygen diffusion coefficients in polymeric solutions

✍ Scribed by Lu-Kwang Ju; Chester S. Ho

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 1010 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)87040-3

✦ Synopsis

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 tirst dmease with an increased polymer concentration, then increase while the polymer concentration exceeds a critical value. Possible explanations for this phenomenon are explored. INTitODUCTlON The information regarding diffusive transport of low molecular weight solutes,