20.500.12556/DKUM-67462 Membranes from polysulfone/N,N-dimethylacetamide/water system structure and water flux Membrane sistema polisulfon/N,N-dimetilacetamid/voda struktura in vodni pretok Polymeric membranes were prepared by the wet-phase separation method from solutions of different contents of polysulfone in N,N-dimethylacetamide; solutions were cast in different thickness before immersion into the pure water coagulation bath. Two main processes take place during the formation of membranes: nucleation and growth of the polymer lean phase with subsequent solidification of the polymer rich phase, and the formation of channels, macrovoids and mega-macrovoids. By the first process a cellular structure is formed whilst the second process connects the cells by opening the space between them. The degree of interconnectedness is an additional factor that affects the pure water flux. By changing the cast solution compositions and/or their cast thickness the interconnectedness of the cells can be controlled. Polimerne membrane smo pripravili z metodo mokre fazne inverzije iz raztopin z različno vsebnostjo polisulfona v N,N-dimetilacetamidu, spreminjali pa smo tudi debelino nanosa raztopine pred potopitvijo v koagulacijsko kopel iz čiste vode. Med formiranjem membrane sta potekala dva osnovna procesa: nukleacija in rast s polimerom revne faze s posledičnim nadaljnjim strjevanjem s polimerom bogate faze ter nastanje kanalov, makrovoidov in mega-makrovoidov. S prvim procesom nastaja celična struktura z izoliranimi in nepovezanimi celicami, medtem ko drugi proces povzroči povezovanje celic z odpiranjem praznega prostora med njimi. Stopnja takšne povezanosti celic je eden od faktorjev, ki določajo pretok čiste vode skozi membrano. S spreminjanjem sestave in/ali debeline nanosa raztopine lahko vplivamo na stopnjo povezanosti celic. chemical technology organic technology polymer membranes membrane preparation wet phase inversion polymers polysulphon kemijska tehnologija organska tehnologija polimerne membrane priprava membran mokra fazna inverzija polimeri polisulfon true false true Angleški jezik Slovenski jezik Znanstveno delo 2017-08-18 13:47:57 2017-08-18 13:48:42 2022-08-01 14:00:30 2019-07-11 16:21:16 2000 0 0 str. 205-213 št. 2 Letn. 47 2000 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1318-0207 678.6.66.081.6 14086149 22323973 1318-0207 URN:SI:UM:DK:JCLYLECW Acta_Chimica_Slovenica_2000_Kaiser,_Stropnik_Membranes_from_polysulfoneN,N-dimethylacetamidewater_system_structure_and_water_flux.pdf Acta_Chimica_Slovenica_2000_Kaiser,_Stropnik_Membranes_from_polysulfoneN,N-dimethylacetamidewater_system_structure_and_water_flux.pdf 1 C448CD54C6EE862492F9A6148886F46C 0d35fa9e38bc59da84e6f3a9caee0468d44a627517004efad45ce761219635d3 87f87a28-7c0e-11eb-bb7a-00155d0001ca 20.500.12556/dkum/9bbb6df9-d194-484e-b982-2368b8c48b83 https://dk.um.si/Dokument.php?lang=slv&id=115543 http://acta-arhiv.chem-soc.si/47/47-2-205.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=115542 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0