| Autor: |
Kaiser, Vladimir, Stropnik, Črtomir |
| Jazyk: |
slovinština |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Materiali in tehnologije, vol. 34, no. 3/4, pp. 151-155, 2000. |
| ISSN: |
1580-2949 |
| Popis: |
Preučevali smo mokro fazno inverzijo ternaranega sistema polisulfon/N,N-dimetilacetamid/voda (PSf/DMA/voda) z namenom, poglobiti razumevanje mehanizma nastajanja polimernih asimetričnih poroznih membran. Morfologije presekov membran smo preučevali z vrstično elektronsko mikroskopijo, sam proces fazne inverzije pa smo opazovali z merjenjem motnosti membranotvornega sistema med procesom nastajanja membrane. Spreminjanje vsebnosti polimera v raztopini (PSf/DMA) in debeline njenega nanosa povzroči v procesu mokre fazne inverzije poleg nastanka polimernega lateksa formiranje morfološko različnih membran. Nastanejo membrane s celično, dvozvezno in krogličasto zrnatao morfologijo. Njihov nastanek lahko predstavimo s "potmi sestave" v ternarnem faznem diagramu polimer/topilo/netopilo in pojasnimo z različnimi načini fazne inverzije. Wet phase inversion of a ternary system polysulfone/N,N-dimethylacetamide/water (PSf/DMA/water) was studied with intention to enhance the understanding of the mechanism of polymeric asymmetric porous membranes formation. Membranes cross-sections were investigated with scanning electron microscopy and the phase inversion process was observed by turbidity measurement of membrane forming system during the membrane forming process. Changing of polymer content in a PSf/DMA solution and thickness of cast layer cause the formation of a polymer latex and morphologically different membranes during the process of wet phase inversion. Membranes with cellular, bicontinuous and bead-like morphology are formed. Their formation can be presented in ternary phase diagram polymer/solvent/nonsolvent by "composition paths" and explained by different modes of phase inversion. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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