| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 101 === In this research, MWCNTs were first oxidized at high temperature. The MWCNTs surface was then modified with polyvinyl pyrrolidone (PVP) and surfactant (SDBS and TX-100). After that, the modified MWCNTs were added to poly(amic acid) (PAA, precursor of polyimide), which were reacted from BPDA and p-PDA, to obtain PAA/MWCNTs composite material. The PI/MWCNTs composite were obtained by multi-step thermal curing process. In this study, the MWCNTs were introduced into the PI matrix in order to increase its mechanical and electrical properties.
In this research, the chemical structure of modified MWCNTs was characterized by Fourier transform infrared spectrometer (FTIR). The thermal properties of PI/MWCNTs nanocomposites were analyzed by Thermo-gravimetric analysis (TGA). The mechanical properties and hardness of PI/MWCNTs nanocomposites were tested by Universal Test Machine. The electrical resistance of PI/MWCNTs nanocomposites were obtained by Super Megohmmeter. Due to the high aspect ratio of MWCNTs, the formation of a network structure between PI and modified MWCNTs significantly improves the electrical conductivity and further increases its thermal stability and mechanical properties of the PI nanocomposite.
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