近年來，氧化石墨烯（GO）逐漸得到重視，GO被廣泛用於形成良好分散的複合材料，以提高機械性能、熱性能和形態學，而聚丙烯腈（PAN）是用於工業生產中製造碳纖維的常見聚合物之一。本文的重點是GO對PAN的熱性能和奈米複合材料結構的影響。
分散良好的PAN / GO複合膜使用溶液澆鑄法來製備。 WAXS剖面顯示了在PAN結構中並沒有局部聚集的GO層，證實GO在複合材料中的良好分散性。 FT-IR光譜說明了PAN鏈和GO分子之間的相互作用是由GO表面和聚丙烯腈的腈基上羥基之間的氫鍵鍵合。
X射線衍射結果顯示，當GO摻入後約3-8％時，PAN的結晶程度將增強。
在含有4％（重量）水的PAN / GO / DMSO溶液的凝膠化行為研究中，凝膠化過程中會產生液-液相分離並且沒有結晶跡象，隨著加入GO後，凝膠動力學會提升。
SDT分析表明，適量的GO可以提高PAN的熱穩定性和PAN的環化溫度會提昇。
此外，我們使用基辛格法估計GO併入PAN後的環化動力學參數，發現
PAN的環化活化能因GO的存在而較高，表示GO將抑制環化，然而當環化結構形成後，GO可能加速環化反應。

Graphene oxide (GO) has received wide attention in recent years. GO has been used to enhance the mechanical properties, thermal behavior and morphology of polymers by forming well-dispersed composites. Polyacrylonitrile (PAN) is one of the common polymers used as the precursor for manufacturing carbon fiber in industrial production. This thesis is focused on the effect of GO on the thermal property of PAN and the morphology of the nanocomposite.
Well-dispersed PAN/GO composite films were prepared using a solution-casting method. WAXS profiles showed no local aggregation of GO layers in PAN matrix, confirming the good dispersion of GO in the composite. FT-IR spectroscopy suggested that the major interaction between PAN chains and GO molecule was the hydrogen bonding between hydroxyl groups on the surface of GO and the nitrile group on PAN. X-ray diffraction results indicated the degree of crystalling of the PAN was enhanced by around 3-8 % upon the incorporation of GO. The study of the gelation behavior of PAN/GO/DMSO solution containing 4 wt% water revealed that a liquid-liquid phase separation occurred during the gelation with no sign of crystallization and the gelation kinetics was found to be increased by the addition of GO.
SDT analysis showed that an appropriate amount of GO may enhance the thermal stability of PAN and the cyclization temperature of PAN was higher in the presence of GO. Furthermore, the kinetic parameters of the cyclization reactions for PAN incorporated with GO were estimated using the Kissinger method. The activation energies of the cyclization reaction for PAN were higher with the existence of GO, implying that GO inhibited the cyclization However, GO may accelerates the cyclization after the cyclized structure was first formed.

Abstract I
INDEX III
CHAPTER 1 INTRODUCTION 1
1.1 Graphene and graphene oxide 1
1.1-1 Discovery and synthesis 1
1.1-2 Characterization and structural features of graphene 5
1.1-3 Properties of graphene and graphene oxide 11
1.2 Graphene-Polymer composites 13
1.2-1 Overview and fabrication 13
1.2-2 Thermal behavior 15
1.2-3 Morphology and crystallization 19
1.2-4 Gelation behavior 22
1.3 Motivation and Objectives of Research 26
CHAPTER 2 EXPERIMENTAL 28
2.1 Materials 28
2.2 Preparation of PAN/GO composite films and gels 28
2.3 Characterization 31
CHAPTER 3 RESUTLS AND DISCUSSION 33
3.1 Characterization of the constituents 33
3.1-1 Graphene oxide 33
3.1-2 Polyacrylonitrile-Itaconic acid copolymer 36
3.1-3 Interaction between PAN and GO 38
3.2 Morphology and Crystallization Behavior 40
3.2-3 Small-Length Scale Morphology and Crystallization 44
3.3 Gelation of PAN/GO nanocomposite 47
3.3-1 Gelation mechanism and additive effect 47
3.3-2 Morphology and Crystallization of PAN/GO gel 51
3.4 Cyclization Mechanism and Thermal Behavior 53
3.4-1 Cyclization mechanism and kinetics 53
3.4-3 Thermal degradation and stability 60
3.4-4 Thermal behavior in different atmosphere 65
CHAPTER 4 CONCLUSION 68
REFERENCES 70

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