- 學位論文
改質多壁奈米碳管補強Nylon12複合材料
Modified Multi-walled Carbon Nanotubes Reinforced Nylon12 Composites
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摘要
本研究使用尼龍(Nylon12，PA12)與多壁奈米碳管(Multi-walled carbon nanotube，MWCNT)經由熔融混練(Melt-blending)法進行混摻，藉此獲得奈米複合材料。為了改善多壁奈米碳管在尼龍中之分散性，首先將多壁奈米碳管加入硝酸溶液中進行酸處理，使碳管表面帶有羧酸(-COOH)官能基，之後加入Jeffamine® M2070 Polyetheramine與Polyethylenimine在溫和的條件下反應，可得到改質後碳管(M-M2070)與(M-PEI)，其中奈米碳管會與改質劑產生醯胺鍵的化學鍵結，藉此提升奈米碳管與尼龍的相容性。針對製備所得Nylon12/MWCNTs奈米複合材料，探討使用不同改質方式對複合材料之熱性質、機械性質與電阻的影響。結果顯示，Jeffamine® M2070 Polyetheramine與Polyethylenimine兩種改質碳管均可以均勻分散在Nylon12中，有效改善複合材料之機械性質及熱性質。機械性質方面，添加3wt%的M-M2070使拉伸強度增加24.1%，添加3wt%的M-PEI使拉伸強度提升18.9%；DMA分析顯示，添加3wt%的M-M2070使儲存模數提升48.2%，添加3wt%的M-PEI使儲存模數提升29.8%。熱性質方面TGA分析結果顯示，Nylon12熱裂解溫度為412.7℃，添加M-M2070後上升43℃，添加M-PEI上升36.7℃。電阻分析部分，Nylon12之表面電阻為1.68×〖10〗^14Ω/□，添加改質碳管M-M2070與M-PEI 3wt%後，電阻值分別為1.33×〖10〗^5Ω/□與4.34×〖10〗^6Ω/□，達到靜電消散的等級，可以避免靜電的危害。
並列摘要
In this study, Nylon (Nylon12, PA12) and multi-walled carbon nanotubes (MWCNTs) were mixed by melt-blending to obtain the nanocomposite material. In order to improve the dispersion of MWCNTs in composites, the MWCNTs were first acid treated by the HNO3 solution to functionalize the carboxylic groups on the surface. Subsequently, these acid treated MWCNTs were reacted with Jeffamine® M2070 Polyetheramine and Polyethylenimine under mild conditions, respectively, to obtain the chemically modified MWCNTs (M-M2070 and M-PEI). The amide groups formed on these chemically modified MWCNTs will enhance the compatibility of MWCNTs and Nylon. The effects of different modification methods on the thermal properties, mechanical properties and electrical resistance of these Nylon12/MWCNTs composites were investigated. The results showed that M-M2070 and M-PEI dispersed in Nylon12 homogeneously, and can improve the mechanical and thermal properties of the composite materials effectively. The tensile strengths of 3 wt% M-M2070 and M-PEI containing composites increased 24.1% and 18.9%, respectively. DMA analysis showed that the storage moduli of 3wt% M-M2070 and M-PEI containing composites increased 48.2% and 29.8%, respectively. TGA analysis showed that pyrolysis temperature of Nylon12 was 412.7℃, and was increased about 43℃ and 36.7℃ by addition of M-M2070 and M-PEI, respectively. Moreover, the surface resistance of Nylon12 was 1.68×〖10〗^14Ω/□, and was decreased to 1.33×〖10〗^5Ω/□ and 4.34×〖10〗^6Ω/□ by addition of 3wt% M-M2070 and M-PEI, respectively. The resistance values of these composites have achieved the level of static dissipation, and can prevent the harm of static electricity.
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