| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 92 === ABSTRACT
Title：
Preparation and Characterization of Polyimide-Silica Nano-composite by Sol-Gel Process.
Pages：77
School：National Taipei University of Technology
Department：Institute of Organic and Polymeric Materials
Time：July, 2004 Degree：Master
Researcher：Yueh-Yu Chen Advisor：Yao-Yi Cheng
Keywords: sol-gel, polyimide-silica, nano-composite.
Polyimide(PI)-based nano-composites were prepared by the in-situ generation of organic silica nano-particles through a sol-gel process, combined with spin coating and multi-step curing process. In this study, silica nano-particles were introduced into the polyimide matrix to promote its mechanical and thermal properties. Nanometer-scale composites were successfully obtained from poly(amic acid) (PAA) mixture loaded with less than 30 wt% silica. 4,4‘-hexafluoroisopropylidenediphthalic anhydride (6FDA) and 4,4’-diaminodiphenyl sulfone (DDS) were employed to synthesize the PAA precursor. The hybrid thin film was prepared from aminoalkoxysilane-capped PAA and tetraethoxysilane (TEOS). The prepared polyimde-silica films were characterized by Fourier transform infrared (FTIR) spectrometry, X-ray photoelectron spectroscopy (XPS), 29Si CP MAS solid NMR spectroscopy, Thermogravimetric analysis (TGA), scanning electron microscope (SEM) and transmission electron microscope ( TEM ). The TGA results indicate that the thermal stability of the nano-composite can be enhanced by up to 43 ℃, as silica content increases to 20%.
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