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Thin-film composite (TFC) membranes with hydrophilic ethyl cellulose-graft-poly(ethylene glycol) (EC-g-PEG) substrates for forward osmosis (FO) application
친수성을 가지는 에틸셀룰로스-폴리에틸렌글라이콜

DC Field Value Language
dc.contributor.advisor이종찬-
dc.contributor.author유윤아-
dc.date.accessioned2017-07-19T05:54:22Z-
dc.date.available2017-07-19T05:54:22Z-
dc.date.issued2015-02-
dc.identifier.other000000024953-
dc.identifier.urihttps://hdl.handle.net/10371/129365-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 화학생물공학부, 2015. 2. 이종찬.-
dc.description.abstractIn this work, ethyl cellulose-graft-poly(ethylene glycol) (EC-g-PEG) was synthesized by esterification of carboxylic acid functionalized methoxy polyethylene glycol (MPEG-COOH) with ethyl cellulose (EC) in order to develop the substrates of thin-film composite (TFC) membranes for forward osmosis (FO) application. The TFC membrane consists of a selective polyamide active layer formed by interfacial polymerization on top of EC-g-PEG substrate fabricated by phase separation. The EC-g-PEG substrates were characterized by water contact angle, porosity, surface roughness, and morphology. It was found that hydrophilicity and porosity of the EC-g-PEG substrate were increased as compared with those of the EC substrate. Using a 2 M NaCl as draw solution and DI water as feed solution, the TFC membranes of EC-g-PEG (TFC-EP) exhibited a 15.7 LMH of FO water flux, while TFC membranes of EC exhibited only 6.6 LMH of FO water flux. Enhanced FO performances of TFC-EP membrane are attributed to increased hydrophilicity and porosity, which play a crucial role in water flux. Moreover, the increase in water permeability and porosity of TFC-EP can be attributed to decrease in structural parameter which resulted in decreased internal concentration polarization (ICP) in EC-g-PEG substrates.-
dc.description.tableofcontentsList of Contents

Abstract ------------------------------------------------------------------------------------ⅰ
List of Tables-------------------------------------------------------------------------------ⅲ
List of Schemes----------------------------------------------------------------------------ⅳ
List of Figures-----------------------------------------------------------------------------ⅴ
List of Supporting Figures--------------------------------------------------------------Ⅶ
List of Contents----------------------------------------------------------------------------Ⅸ

1. Introduction-----------------------------------------------------------------------1

2. Experimental----------------------------------------------------------------------5

2.1. Materials. -------------------------------------------------------------------------5
2.2. Functionalization of MPEG. --------------------------------------------------6
2.3. Esterification reaction between MPEG-COOH and EC. ---------------7
2.4 Characterization of EC and EC-g-PEG. ------------------------------------7
2.5. Preparation of EC and EC-g-PEG membrane substrates. -------------8
2.6. Interfacial polymerization of TFC-FO membranes. ---------------------9
2.7. Characterization of EC and EP membrane substrates and TFC-FO membranes. --------------------------------------------------------------------------10
2.8. Forward osmosis tests. --------------------------------------------------------12

3. Results and Discussion

3.1. Characterization of the functionalized MPEG. --------------------------15
3.2. Synthesis of EC-g-PEG polymer. -------------------------------------------18
3.3. Preparation of membrane substrates. -------------------------------------23
3.4. Characteristics of membrane substrates. ---------------------------------25
3.5. Characteristics of TFC-FO membranes. ----------------------------------37
3.6. Forward osmosis performance of TFC-FO membranes. --------------41

4. Conclusion------------------------------------------------------------------------49
5. References------------------------------------------------------------------------50
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dc.formatapplication/pdf-
dc.format.extent2218342 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subject정 삼투-
dc.subject복합막-
dc.subject친수성-
dc.subject에틸셀룰로스-폴리에틸렌글라이콜-
dc.subject.ddc660-
dc.titleThin-film composite (TFC) membranes with hydrophilic ethyl cellulose-graft-poly(ethylene glycol) (EC-g-PEG) substrates for forward osmosis (FO) application-
dc.title.alternative친수성을 가지는 에틸셀룰로스-폴리에틸렌글라이콜-
dc.typeThesis-
dc.contributor.AlternativeAuthorYu, Yun Ah-
dc.description.degreeMaster-
dc.citation.pages55-
dc.contributor.affiliation공과대학 화학생물공학부-
dc.date.awarded2015-02-
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Theses (Master's Degree_화학생물공학부)
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