| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 93 === In this study, two kinds of monomers-3,3’,4,4’- Biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylenediamine (p-PDA) were employed to synthesize the poly(amic acide) (PAA) precursor of polyimide. Though a sol-gel process, The silica nano-particles were induced into the PAA precursor. Nanocomposites were obtained from PAA mixture load with silica particles combined with spin coating and multi-step curing process. In this study, silica particles were induced into the PI matrix to promote its thermal properties. The coupling agent 3-aminopropyl
triethoxysilane (APrTEOS) was chosen to enhance the bonding between polyimide(PI) and silica(SiO2). The prepared PI-silica structure were characterized by Fourier transform infrared (FTIR) spectrometry, Electron Spectroscopy for chemical Analysis (ESCA), 29Si - CP MAS solid NMR spectroscopy. The thermal properties, crystallization behavior, and transparency of PI-silica nanocomposites were analyzed by Thermogravimetric analysis (TGA), X-ray diffraction (XRD), and UV-VIS, respectively. The morphology of PI-silica were observed by scanning electron microscopy (SEM). The TGA results indicate that the thermal stability of the nanocomposite can be enhanced by up to 20℃, as silica content increases to 20%.The SEM images show that silica particles with a diameter in the range from 40 and 90 nm.
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