(A) study on the pervaporation separation of aqueous ethanol solution through plasma graft-polymerized membranes = 플라즈마 그래프트 중합된 고분자 막을 통한 에탄올수용액의 투과증발분리에 관한 연구

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Plasma graft-polymerized membranes which have functional groups, such as sulfonic acid or carboxlyic acid were prepared to investigate the pervaporation characteristics of aqueous ethanol solution. Membranes of poly(styrenesulfonic acid) which permeate water selectively from water-ethanol mixture were prepared by plasma graft-polymerization of styrene on to porous poly(vinylidene fluoride)(PVDF) films, by sulfonation of the grafted membranes, and by ionization of the sulfonated membranes, respectively. The permselectivities of the grafted(g-PS), sulfonated(g-PSS) and sodium salt form of sulfonated(g-$PSS^{-}Na^{+}$) membranes were investigated in view of the feed composition of water-ethanol mixture, the grafted amount of polystyrene and the morphology of substrate membrane used. It was found that the permselectivity increased with the ethanol concentration in feed, that the grafted amount should be controlled for the optimum separation of water and that the membranes of sponge-like pore are more resistive to ``swelling effect`` than those of finger-like pore. But membranes of sponge-like pore show lower permeation rate than those of finger-like pore, which resulted in lower pervaporation performances. The g-$PSS^{-}Na^{+}$ membrane with grafted amount of poly(styrene) of 0.14 mg/㎠ was found to have high permeation rate of 6.6 kg/㎡hr, and good separation factor of 21 for the pervaporation of ca. 60 wt. % aqueous ethanol solution at 50℃. Membranes of poly(acrylic acid) which permeate water selectively from water/ethanol mixture were prepared by plasma graft-polymerization of acrylic acid(AA) on to porous poly(vinylidene fluoride) films. The pervaporation characteristics of the prepared membranes were investigated in view of the grafted amount of poly(acrylic acid), the feed composition, and the incorporation of different counter-ions. The Na salt form of the AA grafted membrane with grafted amount of 2.26 mg/㎠ was found to have high permeation rate of 4.9 kg/㎡h...
Advisors
Ihm, Son-Kiresearcher임선기researcher
Description
한국과학기술원 : 화학공학과,
Publisher
한국과학기술원
Issue Date
1995
Identifier
99452/325007 / 000885403
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 화학공학과, 1995.2, [ xiv, 123 p. ]

URI
http://hdl.handle.net/10203/28704
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=99452&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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