氧化石墨烯/環氧樹脂複合材料製備及性質研究
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2018
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本研究在於改善石墨烯在環氧樹脂中的分散性以提升複合材料的熱傳性質。首先利用Hummers 法將石墨烯氧化成氧化石墨烯，利用IR、RAMAN、SEM、XRD觀察其結構變化。再來探討環氧樹脂開環、溶劑、添加量等對於複合材料熱傳性質的影響。其次，合成一高分子分散劑PEB，以加強氧化石墨烯分散在環氧樹脂裡。PEB是由Ethylene glycol phenyl ether acrylate和2-[[(Butylamino)carbonyl]oxy] ethyl acrylate經自由基反應聚合得到。經由NMR及IR光譜分析確認其化學結構。之後探討不同單體比例和起始劑濃度的共聚物對於複合材料熱傳性質的影響，並用SEM和DSC觀察氧化石墨烯在環氧樹脂裡的分散性以及熱穩定性。另外添加氮化鋁作為第二種摻料，加強材料的三維空間聯絡網路，使導熱性質提高。
結果顯示，添加了PEB的氧化石墨烯，確能增加在環氧樹脂裡的分散，所得的含5 wt%GO複合材料之熱傳係數(K)從原始的2.56 W/mk提高至3.75W/mk，提升率46%。而若再添加氮化鋁也可以再增加K值，添加20wt%氮化鋁可使5 wt%GO複合材料之K值提高至4.12W/mk，提升率60%。
This research studied on the enhancing the dispersibility of graphene in the epoxy matrix, and improving the thermal conductivity of graphene oxide/epoxy composites. First, we use Hummers Method to oxidize graphene, after oxidized the graphene oxide can become more dispersed in the epoxy, and we use IR, RAMAN, SEM, XRD, XPS to observe the change of chemical structure. Later on we discuss the fabrication of composite ,including the curing of epoxy ,different solvent, the amount of GO added. Secondly, we synthesis copolymer PEB dispersant to improve the dispersibility of graphene oxide in the epoxy. PEB dispersant is prepared from Ethylene glycol phenyl ether acrylate and 2-[[(Butylamino)carbonyl]oxy] ethyl acrylate through a free radical polymerization. The chemical structure is verified from their H-NMR and FT-IR spectra. Later we discuss the monomer ration and initiator would influence the thermal conductivity, and we use SEM to observe the dispersibility of graphene in the epoxy, DSC for the thermal stability. We also add aluminum nitride as second filler which is to believe increasing the 3D network , therefore improve the thermal stability and thermal conductivity. The result shows by adding the PEB dispersant in the graphene oxide, the chemical structure difference can be know from FT-IR, PEB had bond with graphene oxide. SEM shows more dispersed graphene in the epoxy, DSC with higher Tg , thermal conductivity increase from 5wt% 2.56W/mk to 3.75W/mk about 46% higher , additional aluminum nitride can also increase thermal conductivity , additional 20wt% aluminum nitride can increase up to 4.12W/mk about 60%.
This research studied on the enhancing the dispersibility of graphene in the epoxy matrix, and improving the thermal conductivity of graphene oxide/epoxy composites. First, we use Hummers Method to oxidize graphene, after oxidized the graphene oxide can become more dispersed in the epoxy, and we use IR, RAMAN, SEM, XRD, XPS to observe the change of chemical structure. Later on we discuss the fabrication of composite ,including the curing of epoxy ,different solvent, the amount of GO added. Secondly, we synthesis copolymer PEB dispersant to improve the dispersibility of graphene oxide in the epoxy. PEB dispersant is prepared from Ethylene glycol phenyl ether acrylate and 2-[[(Butylamino)carbonyl]oxy] ethyl acrylate through a free radical polymerization. The chemical structure is verified from their H-NMR and FT-IR spectra. Later we discuss the monomer ration and initiator would influence the thermal conductivity, and we use SEM to observe the dispersibility of graphene in the epoxy, DSC for the thermal stability. We also add aluminum nitride as second filler which is to believe increasing the 3D network , therefore improve the thermal stability and thermal conductivity. The result shows by adding the PEB dispersant in the graphene oxide, the chemical structure difference can be know from FT-IR, PEB had bond with graphene oxide. SEM shows more dispersed graphene in the epoxy, DSC with higher Tg , thermal conductivity increase from 5wt% 2.56W/mk to 3.75W/mk about 46% higher , additional aluminum nitride can also increase thermal conductivity , additional 20wt% aluminum nitride can increase up to 4.12W/mk about 60%.
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氧化石墨烯, 環氧樹脂, 複合材料, graphene oxide, epoxy, composite