Huber, K. and Nowack, J. and Göritz, Dietmar (1998) Pervaporation of alcohols in PBT near the glass temperature: An analysis of the concentration-dependent diffusion. JOURNAL OF APPLIED POLYMER SCIENCE, 68 (9). pp. 1503-1515. ISSN 0021-8995, 1097-4628
Full text not available from this repository.Abstract
Differential pervaporation measurements with alcohols in poly(butylene terephthalate) (PBT) in the range of its glass transition temperature were performed. The applied apparatus is based on a gas-chromatographic detection system. The concentration dependency of the diffusion coefficient prevents solving the diffusion equations analytically. Therefore, a method was developed using finite differences in space and time to obtain numerical permeant fluxes under the assumption of certain concentration dependencies D(c). The results of this procedure were compared with the measured permeant fluxes, and intrinsic diffusion coefficients D-0 and explicit functions D(c) were attained. In addition, the concentration profiles of the liquids in the membrane for all times of the pervaporation process could be displayed. The evaluation of the temperature dependency of D(c) shows maxima for the plastification effect of the alcohol molecules at a temperature near T-g. (C) 1998 John Wiley & Sons, Inc.
| Item Type: | Article |
|---|---|
| Additional Information: | DOI ist nicht (mehr) korrekt /gup |
| Uncontrolled Keywords: | POLY(BUTYLENE TEREPHTHALATE); DIFFERENTIAL PERMEATION; SOLVENT DIFFUSION; GAS SORPTION; TRANSPORT; POLYMERS; COEFFICIENTS; COPOLYMERS; MEMBRANES; BLENDS; pervaporation; glassy polymer; finite difference method; PBT; concentration-dependent diffusion |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Dietmar Göritz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Feb 2023 08:42 |
| Last Modified: | 21 Feb 2023 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49798 |
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