| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 95 === The polymer of extrinsically conducting polymer (ECP) can not conduct electricity, so it needs to add an electricity conducting filler to make it conduct electricity. In this study, Multi wall carbon nanotube - Poly ethylene terephthalate (MWNT-PET) and Multi wall carbon nanotube -Polyamide 6 (MWNT-PA6) can be fabricated to become Nano composites with the synthesis: ball-milling then heating and pressurizing. Based on the observation, MWNT-PET and MWNT-PA6 can greatly improve in electric properties. Furthermore, Percolation Threshold occurred when the concentration of MWNT is only 1 wt%, and it explains the synthesis can successfully promote the electric properties with low concentration of MWNT. In addition, the synthesis discovers that the temperature and resistance relationship between these two Nano Composites has not only semi-conductor property but also recoverable property. Therefore, the study has shown a valuable method which can be used in conductive polymer and temperature sensor.
Comparing to the synthesis of ball-milling then heating and pressurizing, using the mixed solvent of Hexafluoroisopropanol (HFIP) and CH2Cl2 to dissolve PET, and then adding MWNT to it can synthesize a nano composite. However, the nano composite represented its weakness and unstableness in electric properties. Thus, in order to solve the above two problems and effectively promote the electric properties of the nano composite, the nano composite needs an addition of high concentrated MWNT (at least 15 wt %).
Finally, this study has shown the effect of using a surfactant to disperse MWNT by using the solution of Sodium dodecyl sulfate (SDS) as a dispersant. During the process of the experiment, the surfactant was assured to make MWNT have the solubility in solution. Then, Polyvinyl alcohol (PVA) can be used as the matrix to closely observe the phenomenon of the dispersion of MWNT.
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