Swelling behavior of PDMS-PMHS pervaporation membranes in ethyl acetate-water mixtures
2004 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 93, no 3, 1384-1393 p.Article in journal (Refereed) Published
Pervaporation composite membranes were prepared with a three-layer structure: a PP support, a PEI microporous structure, and a PDMS-PMHS selective layer. Swelling tests were performed in water, ethyl acetate, and four different ethyl acetate-water mixtures, to calculate the diffusional and swelling parameters. Moreover, the dynamic-mechanical properties of the membranes were obtained before and after the swelling experiments, and their relaxation spectra were characterized with the Fuoss-Kirkwood equation and analyzed in terms of the free volume parameter. It was found that the ethyl acetate possesses high affinity with the composite membranes and that the absorption of these small molecules substantially modifies the viscoelastic behavior and structure of the active layer. The combination of swelling experiments and the study of the mechanical relaxations proved to be an appropriate technique to investigate the behavior of pervaporation membranes immersed in different mixtures.
Place, publisher, year, edition, pages
2004. Vol. 93, no 3, 1384-1393 p.
polysiloxanes, composite membranes, swelling, viscoelastic properties, pervaporation
Chemical Process Engineering
IdentifiersURN: urn:nbn:se:kth:diva-48799DOI: 10.1002/app.20596ISI: 000221965800050OAI: oai:DiVA.org:kth-48799DiVA: diva2:484182
QC 201201272012-01-262011-11-232012-01-27Bibliographically approved