표제지
要約
목차
1. 서론 12
1.1. 탄소 기반 소재 12
1.1.1. 탄소나노튜브 (carbon nanotube, CNT) 12
1.1.2. 그래핀 (graphene) 15
1.2. 열전도도 이론 17
1.3. 열전도도 측정법 18
1) Guarded hot plate method 19
2) Hot wire method 20
3) Laser flash method 20
1.4. 탄소기반 복합재료의 열전도도 22
2. 실험 26
2.1. 실험재료 26
2.2. 탄소나노튜브 표면개질 28
2.2.1. Atom Transfer Radical Polymerization (ATRP) 28
2.2.2. Coagulation 방법 30
2.3. 그래핀 제조 30
2.4. 탄소계 복합재료 제조 31
2.5. FT-IR 및 광투과도 측정 31
2.6. 비열 및 유리전이온도 측정 32
2.7. 형태 관찰 32
2.8. 열확산도 및 열전도도 측정 33
3. 결과 및 고찰 34
3.1. 탄소나노튜브 복합재료 34
3.1.1. 파단면 관찰 34
3.1.2. 밀도 측정 39
3.1.3. UV-Vis 광투과도 39
3.1.4. 유리전이온도에 미치는 영향 42
3.1.5. 열확산도 및 열전도도 44
3.2. 그래핀 나노복합재료 48
3.2.1. 원자현미경 분석 48
3.2.2. FT-IR 분석 48
3.2.3. 파단면 관찰 51
3.2.4. 밀도 측정 52
3.2.5. UV-Vis 광투과도 52
3.2.6. 유리전이온도 55
3.2.7. 열확산도 및 열전도도 55
4. 결론 61
5. References 63
Table 2.1. Properties of PMMA and PS 27
Table 2.2. Properties of multi-wall carbon nanotube andsingle-wall carbon nanotube. 27
Table 2.3. Properties of graphene. 28
Table 3.1. Density of PMMA / CNT composites. 40
Table 3.2. Density of PS / graphene 1 wt% composites at a function of chemical reduction time of graphene oxide (h) 53
Table 3.3. Density of PS / graphene composites 53
Figure 1.1. Different type of carbon nanotube. 14
Figure 1.2. Different types of carbon based materials. 16
Figure 1.3. Images of heat transfer. (a) Metal, (b) Polymer 19
Figure 1.4. △T as a function of time in laser flash method. 21
Figure 3.1. FESEM images of MWNT, (a) x50,000 (b) x100,000 35
Figure 3.2. FESEM images of SWNT, (a) x50,000 (b) x100,000 35
Figure 3.3. Cross-sectional FESEM images of PMMA / MWNTcomposites at 1 wt% loading. (Coagulation method), (a) x5,000 (b) x20,000 36
Figure 3.4. Cross-sectional FESEM images of PMMA / MWNTcomposites at 1 wt% loading. (ATRP method), (a) x5,000 (b) x20,000 36
Figure 3.5. Cross-sectional FESEM images of PMMA / SWNTcomposites at 1 wt% loading. (Coagulation method), (a) x5,000 (b) x20,000 38
Figure 3.6. Cross-sectional FESEM images of PMMA / SWNTcomposites at 1 wt% loading. (ATRP method), (a) x5,000 (b) x20,000 38
Figure 3.7. UV-vis spectra of neat PMMA and PMMA / CNT(0.1 wt%), ATRP method was used to modify the CNT. 41
Figure 3.8. Tg changes with different surface treatment methods.(이미지참조) 43
Figure 3.9. Thermal conductivity of PMMA / MWNT composites as a function of MWNT content. 45
Figure 3.10. Thermal conductivity of PMMA / SWNT composites as a function of SWNT content. 46
Figure 3.11. AFM image of graphene oxide. (a) 10㎛ x 10㎛ (b) 5㎛ x 5㎛ 49
Figure 3.12. FT-IR spectra of graphene oxide and phenyl isocyanate treated graphene oxide. 50
Figure 3.13. Cross-sectional FESEM image of PS / graphene composites at 1 wt% of graphene loading. (a) x5,000 (b) x20,000 54
Figure 3.14. UV-Vis spectra of neat PS and PS / graphene composite at 0.1 wt%, 0.5 wt% loading of graphene (30 h). 56
Figure 3.15. Tg changes of PS / graphene composites as a function of graphene content.(이미지참조) 57
Figure. 3.16. Thermal conductivity of PS / graphene composites as a function of graphene oxide content by chemical reduction time. 59
Figure. 3.17. Thermal conductivity of PS / graphene composites as a function of graphene oxide content. 60