Title Page
Contents
ABSTRACT 11
Ⅰ. INTRODUCTION 13
Ⅱ. BACKGROUND 18
1. Acrylate 18
1.1. Acrylate Monomers 18
1.2. Free Radical Polymerization 19
1.3. Crosslinking Reactions of Acrylate 21
2. Epoxy 23
2.1. Crosslinking Reaction of Epoxy Resins 23
3. Self-stratifying coating 23
3.1. Driving Forces for the Stratification 24
Ⅲ. EXPERIMENTAL SECTION 26
1. Materials 26
2. Synthesis of Acrylate Copolymer 26
3. Preparation of Coatings 28
3.1. Preparation of Acrylate Coatings 28
3.2. Preparation of Epoxide Coatings 28
3.3. Preparation of Self-stratifying Coatings 30
4. Characterization 32
4.1. Fourier Transform Infrared Spectroscopy (FT-IR) 32
4.2. Nuclear Magnetic Resonance (NMR) 32
4.3. Gel Permeation Chromatography (GPC) 32
4.4. Differential Scanning Calorimetry (DSC) 32
4.5. Rigid-body Pendulum Type Physical Properties Testing Instrument (RPT) 33
4.6. Field Emission Scanning Electron Microscope (FE-SEM) 33
4.7. Energy Dispersive X-ray Spectroscopy (EDS) 34
4.8. Contact Angle Measurements 34
4.9. Coating Tests 34
Ⅳ. RESULTS AND DISCUSSION 36
1. Acrylate Copolymer 36
1.1. Synthesis of Acrylate Copolymer 36
1.2. Characterization of Acrylate Copolymer 36
2. Characterization of Acrylate and Epoxy Coatings 41
2.1. Contact Angle and Surface Free Energy Measurement 41
2.2. Curing behaviors 42
2.3. Coating tests 42
3. Characterization of Self-stratifying coatings 48
3.1. According to the surface free energy 48
3.2. According to the lasting time 60
Ⅴ. CONCLUSION 65
Ⅵ. REFERENCES 66
ABSTRACT IN KOREAN 69
Figure 1. Conventional multilayered coating and Self-stratifying coating 16
Figure 2. Automobile coating systems 17
Figure 3. Chemical structure and synthetic procedures of FSMAH-X 27
Figure 4. Self-stratifying coating structure 31
Figure 5. FT-IR Spectra of FSMAH-X 38
Figure 6. ¹H NMR spectra of FSMAH-50 39
Figure 7. Composition and molecular weight of FSMAH-X 40
Figure 8. Water contact angle and surface free energy of FSMAH-X 44
Figure 9. RPT 3000 analysis of (a) FSMAH-X and (b) Epoxy 45
Figure 10. Pencil hardness values of FSMAH-X and Epoxy 46
Figure 11. Cross-cut test results obtained from FSMAH-X, according to ASTM D 3359 standard 47
Figure 12. SEM image of cross-section of self-stratifying coating (a) FSMAH-0, (b) FSMAH-25, (c) FSMAH-50, (d) FSMAH-75 50
Figure 13. EDS generated atom mapping images for the cross-section of self-stratifying FSMAH-50 51
Figure 14. Water contact angle and surface free energy of self-stratifying coatings 53
Figure 15. Comparing surface free energy between FSMAH-X and self-stratifying coating 54
Figure 16. RPT 3000 analysis of FSMAH-50/Epoxy 55
Figure 17. Pencil hardness values of Self-stratifying coating 58
Figure 18. Cross-cut test results obtained from self-stratifying coating, according to ASTM D 3359 standard of FSMAH-50/Epoxy 59
Figure 19. SEM image of cross-section of FSMAH-50/Epoxy coating over time (a)0min, (b)15min, (c)30min, (d)45min 62
Figure 20. Change of Surface free energy over time 63
Figure 21. Change of Pencil hardness values over time 64
Scheme 1. Free radical polymerization mechanism 22
Scheme 2. Curing mechanism of (a) FSMAH-X (b) Epoxy 29