以真空灌注模具製作奈米碳管複合材料

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题名:	以真空灌注模具製作奈米碳管複合材料
其它题名:	Manufacturing Carbon Nanotube Composites By a Vacuum Perfusion Mold.
作者:	林昱維 Yu-Wei,Lin
贡献者:	楊怡寬 IKYang 化學工程與材料工程學系
关键词:	環氧樹脂;硬化劑;奈米碳管;巴克紙複合材料;真空灌注模具 Epoxy;Hardener;Buckypaper;Carbon nanotube composite;Vacuum perfusion mold
日期:	2015
上传时间:	2015-12-15T07:36:29Z (UTC)
摘要:	本研究主要目的在於利用真空灌注模具來製備環氧樹脂與巴克紙複合材料及探討此複合材料的機械性質與熱性質。本研究分為三部份；第一部分為奈米碳管的分散方法與巴克紙的製備；其次探討適合用於真空灌注模具之環氧樹脂的基本性質；最後探討以真空灌注模具製作出之巴克紙複合材料之性質，希望利用此種方式可以解決奈米碳管於複合材料中分散性不佳的問題，並提升複合材料的機械性質。巴克紙製備部分，我們利用溶劑NMP震盪懸浮奈米碳管，使奈米碳管分散性變好，後利用抽氣過濾方式來製備奈米碳管含量較高的巴克紙。因為真空灌注模具實驗之操作以及後續環氧樹脂的基本性質改善，我們選用了Epoxy828並搭配不同比例硬化劑Jointmine930、MDA以及MxDA的混合物作為巴克紙複材的基材中，也探討混合物基材的黏度以及複材灌料率。研究成果顯示，製備出來的巴克紙複材的奈米碳管含量為23.3wt%，最適合真空灌注模具操作的基材樹脂比例為Jointmine930/MDA=8/2，其黏度在50℃下為420cP-500cP，為了增加基材強度在此硬化劑添加了MxDA其最高黏度也僅為550cP。以NMP震盪懸所製備而成的巴克紙，其孔隙度為85vol%，後利用真空灌注模具分別將Jointmine930/MDA=8/2，與3wt%、6wt%、9wt%之MxDA混合樹脂灌入。我們以SEM觀察樹脂填充狀況發現樹脂滲入狀況均勻；以DSC及TGA進行熱性質分析，發現隨著MxDA的增加，巴克紙複材中的玻璃轉移溫度會隨之提升但最大裂解溫度卻會小幅度的減少；以三點曲折與拉伸之動態試驗進行機械性質測試，發現當MxDA增加時，儲存模數也會跟著提升，當濃度達9wt%時，其純料是未添加MxDA的1092%，複材則是225%，巴克紙複合材料之楊氏係數為純料的314%。由數據可知，巴克紙不僅能夠有效的改善碳管分散步均勻的問題，也有效提升複材的機械性質。 The goal of this research is of two folds. First is to apply the vacuum perfusion mold to prepare the nanocomposites from buckypaper with the epoxy as the matrix.Second is to investigate the mechanical and thermal properties of the prepared nanocomposites. The thesis is divided into three parts: first part describes the dispersion of carbon nanotubes and the preparation of buckypaper. Second part investigates the optimal viscosity of the epoxy matrix for the perfusion into the voids of the buckypaper. The last part is about the investigation of the properties of the prepared composites.To obtain a composite with the higher content of carbon nanotube, NMP was used as a medium to sonicate carbon nanotubes for a better dispersion then the suspension was used to prepared buckypapers. For a smooth operation of vacuum perfusion and improved the properties of buckypaper composites , the epoxy828 was chosen to be combined with hardener mixtures consisting of Jointmine930,MDA and MxDA. By investigating the viscosity and the pouring rate of the matrix resins, the optimal-formula was chosen for the research. The result shows that the carbon nanotube content of the buckypaper composite was about 23.3wt%.The optimal hardener mixture owned a composition of Jointmine930/MDA=8/2 and various dosing amounts of MxDA to the optimal mixture were used to implement perfusion within buckypapers. The SEM images of fracture sections show the matrix resin homogeneously impregnated throughout the composites. DSC and TGA analysis show that Tg of neat epoxies and composites increase with the content of MxDA, while the maximum pyrolysis temperature of composites shows reverse behavior. DMA analysis of both three point bending and tensile stretching showed that the storage modulus of the neat epoxies and composites are enhanced by about 1092% and 225% by MxDA doing and the Young’s modulus of the composite was 314% of that of neat epoxy. The research demonstrates in the experiment data that the mechanical properties could be enhanced by the addition of MxDA and the preparation of carbonanotube composites from buckypaper not only avoids the problem of poor dispersion of the carbon nanotubes in the matrix polymers, but also leads to superior mechanical properties of the product.
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