Study on the mechanism of membrane formation from polysulfone/polyethersulfone/N-methyl-2-pyrrolidone/ water system by means of immersion precipitation = 폴리술폰/폴리에테르술폰/NMP/물 시스템으로부터 침적응고에 의해 제조된 분리막의 형성기구에 관한 연구

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To construct the phase diagram of polysulfone (PSf)/polyethersulfone (PES)/ N-methyl-2-pyrrolidone (NMP)/water, cloud point measurement was carried out by a titration method. Six interaction parameters were estimated and the calculated phase diagram fitted the cloud point measurement well. In addition to the usual polymer/liquid phase separation, polymer/polymer phase separation resulting PSf-rich phase and PES-rich phase was observed with the addition of small amount of nonsolvent. This polymer/polymer separation is due to the immiscibility between the PSf and PES and the miscible region in the quaternary phase diagram was narrowed with the addition of PES in PSf. The boundary separating these two modes of phase separation could be well described and predicted from the calculated phase diagrams using the estimated interaction parameters of the components. The membranes made of PSf/PES blend show the distinctive morphology that are developed horizontally - horizontal macrovoids and horizontal ladder-like structure, which is considered to be caused by the polymer/polymer phase separation due to the immiscibility of PES and PSf.
Advisors
Kim, Sung-Chulresearcher김성철researcher
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
1998
Identifier
143525/325007 / 000945195
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학공학과, 1998.8, [ ix, 108 p. ]

Keywords

Phase separation mechanism; Immersion precipitation; Membrane; Quaternary system; 사성분계; 상분리기구; 침적응고; 분리막

URI
http://hdl.handle.net/10203/28790
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=143525&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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