Transport properties and morphology of aromatic polyamide membranes방향족 폴리아미드막의 투과 특성과 몰폴로지

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As a membrane material, poly(m-phenyleneisophthalamide) was prepared by low-temperature solution polycondensation. The ultrafiltration measurement and dialysis test were performed to study the transport properties of the aromatic polyamide membranes. The morphology of aromatic polyamide membranes was also investigated with the aid of the scanning electron microscope(SEM). In ultrafiltration measurement, the water flux was determined with an Amicon Model 8050 ultrafiltration. In dialysis test, the permeability coefficients and a homologous series of ethylene glycol through aromatic polyamide membranes and a commercial cuprophane membrane were determined using a continuous flow dialysis apparatus. The effects of the temperature of solvent evaporation, existence of inorganic salts(LiCl, CaCl$_2$) and the nature of precipitation medium on the membrane performance and morphology were as follows : (1) As the temperature of solvent evaporation increased, the water flux of the membrane decreased due to higher solvent evaporation rate which ultimately resulted a thick, dense skin layer in the asymmetric membrane. (2) An aromatic polyamide membrane cast from a binary solution, containing only polymer and solvent, exhibited a water flux of 30-50 1/m$^2$ day while membranes prepared under the same conditions with an appropriate additive exhibited a water flux as high as 1000 1/m$^2$day. (3) As the glycerine concentration in the water-glycerine precipitation medium increased, a denser sponge structure of the membrane and lower permeation rates were observed. From the dialysis results through aromatic polyamide membranes precipitated in water-glycerine mixtures, the permeability coefficients were inversely proportional to the square root of the permeant molecular weight. (4) In order to study the dependence of permeability coefficients on operating conditions, the operating temperature was varied as 23, 30, $37\,^\circ\!C$ and the operating flow rate 100, 200, 300 ml/min. Th...
Advisors
Kim, Sung-ChulresearcherKim, Un-Youngresearcher김성철researcher김은영researcher
Description
한국과학기술원 : 화학공학과 화학공정공학 전공,
Publisher
한국과학기술원
Issue Date
1984
Identifier
64097/325007 / 000823513
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 화학공학과 화학공정공학 전공, 1984.2, [ iv, 74 p. ]

URI
http://hdl.handle.net/10203/29298
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=64097&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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