Measurements of mutual diffusivities in concentrated solutions of membrane-forming polyamides and cellulose acetate
| Autor: | Carl C. Gryte, Liao-Ping Cheng, An-Hwa Dwan |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Formic acid Analytical chemistry Concentration effect General Chemistry Polymer Toluene Cellulose acetate Surfaces Coatings and Films chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Copolymer Polystyrene Mass fraction |
| Zdroj: | Journal of Applied Polymer Science. 57:563-572 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1995.070570506 |
| Popis: | Mutual diffusivities at 25°C were measured in the range of the polymer weight fraction of 0.15-0.5, using differential interference microscopy. Diffusivities of atactic polystyrene in toluene at 25°C for 0.35-0.5 polymer weight fractions showed good agreement with the prediction of Vrentas and Duda. Polyamides (nylon-6, nylon-66, and a nylon-6, -66, and -610 amorphous terpolymer) in formic acid all exhibited very similar diffusivities. Although slightly higher in magnitude, the mutual diffusivities of cellulose acetate (39.8 wt % acetyl) in acetone had a compositional dependence that was parallel to the data for the polyamides. In the range of composition studied, there was an unanticipated very weak dependence of mutual diffusivity on the polymer weight fraction. © 1995 John Wiley & Sons, Inc. |
| Databáze: | OpenAIRE |
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