本實驗以聚醯胺酸(PAA)加入多壁奈米碳管並攪拌(Blending),並以旋轉塗佈和階段性熱熟化步驟製備不同比例的聚醯亞胺-奈米碳管複合材料,並探討PI與不同改質奈米碳管的性質。 本實驗利用傅立葉轉換紅外光譜儀(FTIR)及雷曼光譜儀(Raman)來鑑定化學結構,熱重損失分析儀(TGA)探討複材的熱穩定性質,萬能試驗機(Universal Test Machine)來測定複材的機械性質,超絕緣儀(super megohmmeter)測複材的導電性,穿透式電子顯微鏡(TEM)觀察奈米碳管的表面型態及奈米碳管在複材裡的型態和分散性以及偏光顯微鏡(POM)來觀察奈米碳管在複材裡的分散性。從 FTIR 的結果可知碳管改質是成功的,並以TEM 佐證之。複材方面,聚醯亞胺-改質奈米碳管複材於TGA 熱分析和萬能試驗機的結果顯示PI的熱穩定性和機械性質是以加入耦合劑改質的奈米碳管效果最佳,而複材導電性由結果顯示經由硝酸純化後的奈米碳管效果最佳。
Various ratios of MWCNTs were added to the PAA to prepare PI/MWCNTs composites by spin coating and four-step curing. The thermal properties and mechanical properties were examined in this study. The characteristic functional group of modified MWCNTs was identified by Fourier transform infrared spectrometer, and the structures were investigated by Raman spectroscopy. The thermal properties of PI/MWCNTs nanocomposites were analyzed by Thermogravimetric analysis (TGA). The mechanical properties of PI-MWCNTs nanocomposites were tested by Universal Test Machine. The electrical conductivity properties of PI-MWCNTs nanocomposites were obtained by Super Megohmmeter. The surface morphology of carbon nsnotube and dispersion of PI-MWCNTs nanocomposites were observed by Transmission electron microscopy (TEM). The dispersion of PI-MWCNTs nanocomposites were observed by Polarized Optical Microscope (POM). The modified MWCNTs were successful prepared which was verified by the result of FTIR and TEM. The results of TGA and Universal Test Machine showed that the PI/G-MWCNTs had the best thermal stability and mechanical property. The Super Megohmmeter result showed that the PI/Na-MWCNTs had the best conductivity.