표제지
목차
국문요약 14
I. 서론 16
II. 이론적 배경 19
1. 종이 포장재 20
2. 종이 포장에서 생분해성 고분자 적용 23
3. Polyhydroxyalkanoates (PHAs) 26
4. 고분자 블렌드 29
5. 셀룰로오스 유도체 31
6. 고분자/clay 나노복합체 35
III. 재료 및 방법 38
1. 공시재료 39
1.1. 코팅 원지 39
1.2. 코팅 고분자 39
1.3. 고분자 충전제 40
2. 실험방법 41
2.1. PHB/EC 블렌드 제조 및 특성 41
2.2. PHB/EC 블렌드 코팅지 제조 43
2.3. 유기화 nanoclay 제조 43
2.4. Nanoclay를 적용한 PHB/EC 블렌드 코팅지 제조 45
2.5. PHB/EC 블렌드 코팅 적성 46
2.6. PHB/EC 블렌드 코팅지 특성 47
IV. 결과 및 고찰 49
1. PHB/EC 블렌드의 특성 50
1.1. 형태적 특성 50
1.2. 열적 특성 55
2. PHB/EC 블렌드의 코팅 적성 59
3. PHB/EC 블렌드의 코팅지의 특성 69
3.1. 형태적 특성 69
3.2. 표면화학적 특성 74
3.3. 차단 특성 77
3.4. 기계적 특성 89
4. Nanoclay 적용에 따른 PHB/EC 블렌드 코팅지의 특성 94
4.1. 형태적 특성 94
4.2. 차단 특성 101
4.3. 기계적 특성 106
V. 결론 109
참고문헌 112
Abstract 121
Table 1. Classification of paper packaging based on paper types and... 21
Table 2. Main PHAs structures based on Fig. 2. 27
Table 3. Overview of important commercial cellulose ethers. 33
Table 4. Properties of base papers 39
Table 5. Blending ratio of PHB/EC 41
Table 6. Nanoclay content in PHB/EC blend for paper coating 46
Table 7. Onset temperature (Tonset) and derivative peak temperature...[이미지참조] 55
Table 8. Calorimetric data of the pure PHB and the PHB/EC blends... 57
Table 9. Thickness (μm) of the base paper and the PHB coated paper... 63
Fig. 1. Classification of the biodegradable polymers. 24
Fig. 2. Generic chemical structure of PHAs. 26
Fig. 3. Representative structures of cellulose esters for plastics. 32
Fig. 4. Structure of MMT (phyllosilicate clay). 36
Fig. 5. The tortuous pathway in polymer/clay nanocomposites. 37
Fig. 6. The schematic diagram of preparing PHB/EC blend films. 42
Fig. 7. The schematic diagram of preparing PHB/EC blend... 43
Fig. 8. The schematic presentation of the structure of... 45
Fig. 9. Photographs of the PHB/EC blend films with different polymer blending ratios... 51
Fig. 10. FE-SEM images (x200) of the PHB/EC blend films with different polymer... 53
Fig. 11. FE-SEM images (x1000) of the PHB/EC blend films with different polymer... 54
Fig. 12. TGA curves of the pure PHB and the PHB/EC blends with... 56
Fig. 13. Derivatives of the weight loss curves of the pure PHB and... 56
Fig. 14. DSC traces of the pure PHB and PHB/EC blends with... 58
Fig. 15. FE-SEM images (x100) of the PHB coated glassine paper with different coat... 60
Fig. 16. FE-SEM images (x100) of the PHB coated wood-free paper with different coat... 61
Fig. 17. FE-SEM images (x100) of the PHB coated kraft paper with different coat... 62
Fig. 18. FE-SEM images (x100) of the PHB/EC blend coated kraft paper (coat weight: 18 g/m²)... 64
Fig. 19. Changes in surface roughness of the PHB/EC blend coated... 65
Fig. 20. A photograph (left) and an FE-SEM image (right) of... 66
Fig. 21. Changes in internal bond strength of the PHB/EC blend... 66
Fig. 22. Photographs of fractured samples of the PHB/EC blend coated paper (coat weight: 18 g/m²) after... 68
Fig. 23. FE-SEM images (x200) of the PHB/EC blend coated glassine paper (coat weight: 18 g/m²) with... 70
Fig. 24. FE-SEM images (x1000) of the PHB/EC blend coated glassine paper (coat weight: 18 g/m²)... 71
Fig. 25. FE-SEM images (x2000) of the PHB/EC blend films (a: PHB, b: EC25 c: EC50) and the PHB/EC... 73
Fig. 26. Water contact angles of the PHB/EC blend coated glassine... 75
Fig. 27. Changes in water contact angles of the PHB/EC blend coated... 76
Fig. 28. Toluene contact angles of the PHB/EC blend coated glassine... 76
Fig. 29. Changes in air permeability of the PHB/EC blend coated... 78
Fig. 30. Changes in air permeability of the PHB/EC blend coated... 78
Fig. 31. Changes in air permeability of the PHB/EC blend coated kraft... 79
Fig. 32. Changes in cobb1800 value of the PHB/EC blend coated...[이미지참조] 81
Fig. 33. Changes in cobb1800 value of the PHB/EC blend coated...[이미지참조] 81
Fig. 34. Changes in cobb1800 value of the PHB/EC blend coated kraft...[이미지참조] 82
Fig. 35. Changes in cobb1800 value of the PHB/EC blend coated paper...[이미지참조] 82
Fig. 36. Changes in water vapor transmission rate of the PHB/EC... 84
Fig. 37. Changes in water vapor transmission rate of the PHB/EC... 84
Fig. 38. Changes in water vapor transmission rate of the PHB/EC... 85
Fig. 39. Changes in water vapor transmission rate of the PHB/EC... 85
Fig. 40. Changes in kit rating of the PHB/EC blend coated glassine... 87
Fig. 41. Changes in kit rating of the PHB/EC blend coated wood-free... 88
Fig. 42. Changes in kit rating of the PHB/EC blend coated kraft paper... 88
Fig. 43. Changes in tensile strength (left) and strain (right) of the PHB/EC blend coated glassine paper... 91
Fig. 44. Changes in tensile strength (left) and strain (right) of the PHB/EC blend coated wood-free paper... 92
Fig. 45. Changes in tensile strength (left) and strain (right) of the PHB/EC blend coated kraft paper depending... 93
Fig. 46. FE-SEM images (x500) of the PHB/EC blend (EC50) coated glassine paper with non-modified clay... 95
Fig. 47. X-ray diffraction patterns of non-modified clay and... 96
Fig. 48. Dispersibility of non-modified clay (left) and modified... 96
Fig. 49. EDS mapping images of non-modified clay (a: 5 wt%) and modified nanoclay (b: 5 wt%, c: 10... 98
Fig. 50. EDS spectra of the surface of the PHB/EC blend (EC50) coated glassine paper with non-modified... 99
Fig. 51. FE-SEM images (x3000) of the PHB/EC blend (EC50) coated glassine paper with... 100
Fig. 52. Changes in air permeability of the nanoclay reinforced... 102
Fig. 53. Changes in cobb1800 value of the nanoclay reinforced PHB/EC...[이미지참조] 103
Fig. 54. Changes in water vapor transmission rate of the nanoclay... 105
Fig. 55. Changes in kit rating of the nanoclay reinforced PHB/EC... 106
Fig. 56. Changes in tensile strength (left) and strain (right) of the nanoclay reinforced PHB/EC blend coated... 108