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Concrete Formation of Organic Thin Film on Metal via Reduction of Aryl Diazonium Salt : 다이아조늄 염을 이용하여 금속위에 성장하는 고분자박막의 형성

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dc.contributor.advisor유웅열-
dc.contributor.author김재호-
dc.date.accessioned2017-07-14T03:13:16Z-
dc.date.available2017-07-14T03:13:16Z-
dc.date.issued2016-08-
dc.identifier.other000000136231-
dc.identifier.urihttps://hdl.handle.net/10371/123383-
dc.description학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2016. 8. 유웅열.-
dc.description.abstractIn this study, surface modification with organic thin layer concretely adhered to commercially available zinc coated steel surfaces was achieved with diazonium induced grafting process. Unlike electrically induced grafting process requiring extremely anhydrous condition, the diazonium induced grafting process works at room temperature, atmospheric pressure, in aqueous medium and without any external energy source. This process relies on the chemical reduction of diazonium salts by reducing agents in absence or presence of a vinylic monomer. Typically, aryl diazonium salts are reduced by reducing agent to give aryl radicals leading (i) to the formation of a grafted polyphenylene-like film on the substrate surface and (ii) to the initiation of the radical polymerization of the vinylic monomer in solution. The resulting radical-terminated oligomer chains formed in solution are then able to react with ortho site of the polyphenylene primer layer. Herein, a number of polymer thin-films, i.e. poly (acrylonitrile) (PAN), poly (methyl methacrylate), PMMA, poly (acrylic acid) (PAA) and polynitrophenylene (PNP) were successfully grafted on the steel substrates. Accordingly, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy and contact angle were used to investigate grafted organic layers. Furthermore, lap shear test was conducted to evaluate the grafted organic layer can be used as an adhesion primer to plastic, i.e. polyamide 6 (PA6), and the durability of these joins after exposing to 92˚C hot water.-
dc.description.tableofcontents1. Introduction 1

2 .Experimental Section 6
2.1. Materials 6
2.2. General mechanism for grafting process 6
2.2.1 Spontaneous grafting of diazonium salt 7
2.2.2 Redox grafting 9
2.2.3 Overall procedure of grafting 11
2.3. Characterization 12
2.3.1 Electrochemical analysis 12
2.3.2 Scanning electron microscopy (SEM) 12
2.3.3 Spectroscopic analysis 12
2.3.4 Atomic force microscopy (AFM) 14
2.3.5 Single Lap Shear Test 14

3. Results and Discussion 16
3.1. Redox grafting of NBD 16
3.2. The role of reducing agent 21
3.3. Grafting of various polymers on steel substrate 27
3.4. Thickenss control 30
3.5. Lap shear strength 33

4. Conclusion 41

Bibliography 43

Korean Abstract 49
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dc.formatapplication/pdf-
dc.format.extent2994596 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectdiazonium-
dc.subjectgrafting-
dc.subjectadhesion primer-
dc.subject.ddc620-
dc.titleConcrete Formation of Organic Thin Film on Metal via Reduction of Aryl Diazonium Salt-
dc.title.alternative다이아조늄 염을 이용하여 금속위에 성장하는 고분자박막의 형성-
dc.typeThesis-
dc.description.degreeMaster-
dc.citation.pagesix,7-
dc.contributor.affiliation공과대학 재료공학부-
dc.date.awarded2016-08-
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