本論文主要探討製備酯化氧化石墨烯和聚酯的奈米複合材料之性質與鑑定。這項研究中，酯化氧化石墨烯（EGO）可以通過氧化石墨烯（GO）奈米片的酯化來合成。結果表明，酯基已成功接枝到氧化石墨烯的表面。酯化氧化石墨烯和聚酯（聚對苯二甲酸乙二醇酯，PET）的二元混合物可以增加氧化石墨烯和聚對苯二甲酸乙二醇酯相之間的相容性，並改善熱穩定性、機械性質和表面性能。並且通過SEM和AFM圖像觀察氧化石墨烯和酯化氧化石墨烯奈米薄片的形態，主要呈現出大約2.8 nm的厚度。同時與氧化石墨烯相比，酯化氧化石墨烯的BET比表面積增加了十倍以上，其平均孔徑僅為9.6 nm。本實驗採用熔融共混法製備了EGO/PET奈米複合材料。EGO3/PET的熱性質結果表明結晶溫度（Tc）提高了2°C、裂解溫度（Td）提高了約1°C和EGO3/PET奈米複合材料的結晶度（XC）增加了1 %。此外，與純PET相比之下，EGO3/PET薄膜具有較高的水接觸角為105.3°的和低表面自由能γSL為10 mJ/m2。另外，GO/PET和EGO3/PET的機械性能得到了增強，兩者硬度增加了大約3度和楊氏模量分別增加了約0.25和2。另一方面，EGO3/PETG的熱性能使裂解點（Td）提高了1°C。表面特性也提高了102°的水接觸角，並且呈現疏水特性和硬度增加了大約2度。此外，通過測試GO/PETG和EGO/PETG薄膜的水蒸氣和氧氣的滲透性，其結果呈現出高阻氧的特性。

This thesis describes the esterified graphene oxides (EGO) can be synthesized by the esterification of graphene oxide (GO) and blending with polyester. The results demonstrated that ester groups have been successfully grafted onto the surface of graphene oxide. The binary blends of the esterified graphene oxide and polyester can enhance the compatibility between graphene oxide and polyethylene terephthalate phases as well as improve the thermal stability, mechanical properties, and surface properties. The morphologies of graphene oxide and esterified graphene oxide nanosheets were confirmed by SEM and AFM images which mainly present a similar thickness of around 2.8 nm. The specific surface area of esterified graphene oxide has been increased over ten times with a low mean pore diameter of 9.6 nm compared to graphene oxide. The nanocomposites of EGO/PET and EGO/PETG have been prepared by the melt-blending method. The thermal properties results of the EGO3/PET show that the crystallization temperature (Tc) has been increased by 2°C, the decomposition temperature (Td) was improved by about 1°C, and the crystallinity degrees (XC) of EGO3/PET has been increased by 1 %. Moreover, the EGO3/PET films reveal a high water contact angle of 105o with low surface free energy γ_SL about 10 mJ/m2 compared to the pristine PET. In addition, the mechanical properties of GO/PET and EGO3/PET have enhanced hardness value and Young's modulus. On the other hand, the decomposition temperature of EGO3/PETG increased by 1°C. The surface characteristic has been enhanced with a water contact angle of 102o indicating the hydrophobic properties. In addition, the mechanical properties of GO/PETG and EGO3/PETG have enhanced the hardness value. Moreover, the gas permeability of GO/PETG and EGO/PETG film was tested by water vapor transmission rate and oxygen transmission rate, the results presented the high oxygen barrier characteristic.

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