표제지
Abstract
목차
제1장 서론 11
제2장 이론적 배경 13
2.1. 탄소섬유 13
2.2. 열경화성 고분자수지 19
2.2.1. 에폭시수지 21
2.2.2. 에폭시 복합재료 23
2.3. 탄소나노튜브 (Carbon nanotubes, CNTs) 27
2.3.1. 탄소나노튜브의 구조 및 성질 27
2.3.2. 탄소나노튜브의 분산기술 27
2.4. 자외선경화 (UV curing) 30
2.4.1. 자외선 경화기술을 이용한 에폭시 수지의 경화반응 32
제3장 실험 39
3.1. 재료 39
3.2. MWCNT-탄소직물의 준비 39
3.3. 에폭시수지와 경화제의 혼합용액 준비 45
3.4. 에폭시/MWCNT/탄소직물 복합재료의 제조 45
3.5. 특성분석 48
3.5.1. MWCNT/탄소직물의 모폴로지 관찰 48
3.5.2. 복합재료 열안정성 분석 48
3.5.3. 복합재료 열팽창특성 분석 48
3.5.4. 동역학적 열특성 분석 51
3.5.5. 에폭시/MWCNT/탄소직물 복합재료의 인장시험 분석 51
3.5.6. 에폭시/MWCNT/탄소직물 복합재료의 파단면 관찰 51
제4장 결과 및 고찰 52
4.1. MWCNT/탄소직물의 모폴로지 관찰 52
4.2. 에폭시/MWCNT/탄소직물 복합재료의 열안정성 52
4.3. 에폭시/MWCNT/탄소직물 복합재료의 열팽창계수 60
4.4. 에폭시/MWCNT/탄소직물 복합재료의 동역학적열특성 61
4.5. 에폭시/MWCNT/탄소직물 복합재료의 인장특성 67
4.6. 에폭시/MWCNT/탄소직물 복합재료의 파단면 관찰 70
제5장 결론 72
참고문헌 74
Table 2.1. Various properties of carbon fiber 16
Table 2.2. Comparisons of the various properties between unsaturated polyester and epoxy resins 24
Table 2.3. Advantages and disadvantages of various epoxy hardeners 25
Table 2.4. Various properties of Carbonnanotube(SWNT) 29
Table 3.1. Properties of Epoxy resin(YD-128) used in this work 41
Table 3.2. Features of carbon fabric used in this work 43
Table 3.3. UV curing conditions of epoxy/MWCNT/carbon fabric composite 49
Table 3.4. UV intensities resulting from different wavelength regions UV lamp 50
Table 4.1. Decomposition temperature and epoxy content, found from the TGA result of epoxy/MWCNT/carbon fabric composites by UV and thermal curing technique 59
Table 4.2. Coefficients of thermal expansion of epoxy/MWCNT/Carbon fabric composites by UV and thermal curing technique determined from different temperature regions 63
Table 4.3. Effect of MWCNT content on the storage modulus and tan δ of epoxy/MWCNT/carbon fabric Composites by UV and thermal curing technique at 30℃, 50℃ and Tg(이미지참조) 66
Table 4.4. The tensile modulus, tensile strength, and elongation at break of epoxy/MWCNT/carbon fabric composites processed by UV and thermal curing technique 69
Figure 2.1. Changes of structure during stabilization of PAN fiber precursor. 14
Figure 2.2. Schematic of manufacturing progress of carbon fiber. 15
Figure 2.3. Classification of commercial carbon fibers, depending on the level of the mechanical properties. 17
Figure 2.4. Products and applications of carbon fiber. 18
Figure 2.5. Schematic of A-stage, B-stage, and C-stage showing curing and crosslinking stages of thermosetting polymer molecules. 20
Figure 2.6. Synthesis mechanism of diglycidyl ether of bisphenol A (DGEBA) 22
Figure 2.7. A mechanism of chemical bond formation occuring between epoxy resin and amine hardener. 26
Figure 2.8. The structure of carbon nanotubes. 28
Figure 2.9. Comparisons between electron beam curing and thermal curing of epoxy resins. 33
Figure 2.10. Activation procedure of cationic initiator by UV irradiation. 35
Figure 2.11. UV curing mechanism of epoxy resin using a cationic initiator. 36
Figure 2.12. UV curing mechanism between epoxy monomer and onium salt. 37
Figure 3.1. Chemical structure of diglycidyl ether of bisphenol-A (DGEB-A). 40
Figure 3.2. Chemical structures of photo-intiator (triarylsulfonium hexafluoroantimonate, antimonate-type photo-initiator, THA). 42
Figure 3.3. Schematic of experimental procedure for preparing MWCNT dispersed carbon fabrics. 44
Figure 3.4. Preparation of a mixture of epoxy/THA(Sb-type photo-initiator) for fabrication of epoxy/MWCNT carbon fabric composite. 46
Figure 3.5. Schematic of UV and thermal curing processes for fabricating epoxy/MWCNT/carbon fabric composite. 47
Figure 4.1. FE-SEM images of carbon fabrics "as-received". 53
Figure 4.2. FE-SEM images of carbon fabric distributed to 0.05 wt% MWCNT/methanol solution. 54
Figure 4.3. FE-SEM images of carbon fabric distributed to 0.10 wt% MWCNT/methanol solusion. 55
Figure 4.4. FE-SEM images of carbon fabric distributed to 0.20 wt% MWCNT/methanol solution. 56
Figure 4.5. Result of EDS for MWCNT and carbon fiber on 0.20 wt% MWCNT distributed carbon fabric. 57
Figure 4.6. TGA (A) and DTG (B) curves of epoxy/MWCNT/carbon fabric composites by UV and thermal curing technique. 58
Figure 4.7. TMA curves of epoxy/MWCNT/carbon fabric composites by UV and thermal curing technique. 62
Figure 4.8. Storage modulus (A) and tan δ(B) curves measured for Epoxy/MWCNT/Carbon fabric composites with different MWCNT contents by UV and thermal curing technique. 65
Figure 4.9. Results of tensile modulus (A), strength (B), elongation at break (C), and s-s curves (D) of epoxy AlW CNT/carbon fabric composites by UV and thermal curing technique. 68
Figure 4.10. Fracture surface of epoxy/MWCNT/carbon fabric composite distributed on 0.20 wt% MWCNT/methanol solution. 71