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Titolo:
A new modeling of asymmetric membrane formation in rapid mass transfer system
Autore:
Kim, YD; Kim, JY; Lee, HK; Kim, SC;
Indirizzi:
Korea Adv Inst Sci & Technol, Ctr Adv Funct Polymers, Taejon 305701, SouthKorea Korea Adv Inst Sci & Technol Taejon South Korea 305701 05701, SouthKorea Chungwoon Univ, Dept Ind Chem, Hongsung Gun 350800, Chungnam, South Korea Chungwoon Univ Hongsung Gun Chungnam South Korea 350800 gnam, South Korea
Titolo Testata:
JOURNAL OF MEMBRANE SCIENCE
fascicolo: 1, volume: 190, anno: 2001,
pagine: 69 - 77
SICI:
0376-7388(20010831)190:1<69:ANMOAM>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-PHASE-SEPARATION; IMMERSION-PRECIPITATION; POLYURETHANE MEMBRANES; POLYSULFONE MEMBRANES; POLYMER; VITRIFICATION; NUCLEATION; MACROVOIDS; GELATION; SOLVENT;
Keywords:
polyurethane membrane; phase separation; diffusion; theory; thermodynamics;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Kim, SC Korea Adv Inst Sci & Technol, Ctr Adv Funct Polymers, 373-1 KusongDong, Taejon 305701, South Korea Korea Adv Inst Sci & Technol 373-1 KusongDong Taejon South Korea 305701
Citazione:
Y.D. Kim et al., "A new modeling of asymmetric membrane formation in rapid mass transfer system", J MEMBR SCI, 190(1), 2001, pp. 69-77

Abstract

Mass transfer process involved in the immersion precipitation of polyurethane/dimethylformamide (DMF)/water system was investigated. The set of diffusion equations describing the local composition of the membrane solution asa function of space coordinate and time were solved by numerical method, and the composition path in the phase diagram was obtained. Instead of boundary conditions based on the instantaneous equilibrium assumption between membrane solution and coagulation bath, new boundary conditions were set up by using mass transfer formalism at the interface which is especially valid in the condition that the mass transfer rate is extremely rapid. Phase separation phenomena during immersion precipitation were taken into account to continue the calculation after phase separation. The calculated results showed that the chance of phase separation via spinodal decomposition increases with the strength of nonsolvent, addition of nonsolvent to the dope solution, and the use of more hydrophobic polymer. The proposed model is the improvement of the previous works eliminating the equilibrium assumption at the interface and extending the calculation after phase separation. (C) 2001 Published by Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 08:20:51