Organic-inorganic hybrid materials consisting of inorganic materials and organic polymers are a new class of materials, which have received much attention in recent years. In the present investigation, at first, the surface of nano-alumina (Al 2 O 3) was treated with a silane coupling agent of γ-aminopropyltriethoxysilane (KH550), which introduces organic functional groups on the surface of Al 2 O 3 nanoparticles. Then fluorinated polyimide (PI) was synthesized from 4,4-(hexafluoroisopropylidene) diphthalic anhydride and 4,4-diaminodiphenylsulfone. Finally, PI/modified Al 2 O 3 nanocomposite films having 3, 5, 7 and 10% of Al 2 O 3 were successfully prepared by an in situ polymerization reaction through thermal imidization. The obtained nanocomposites were characterized by fourier transform infrared spectroscopy, thermogravimetry analysis, X-ray powder diffraction, UV-Vis spectroscopy, field emission scanning electron microscopy and transmission electron microscopy. The results show that the Al 2 O 3 nanoparticles were dispersed homogeneously in PI matrix. According to thermogravimetry analysis results, the addition of these nanoparticles improved thermal stability of the obtained hybrid materials. Keywords. Al 2 O 3 nanoparticles; γ-aminopropyltriethoxysilane; polyimide nanocomposite; in situ polymerization.
Nanocomposites of high performance polyimide and modified multiwalled carbon nanotube were prepared via in situ polymerization technique. Neat fluorinated polyimide was synthesized from the reaction between 4,4′-(hexafluoroisopropylidene) diphthalic anhydride and 2-(3,5-diaminophenyl)-benzimidazole. Polyimide/modified carbon nanotube nanocomposites enclosing 0.5, 1, 3, and 5% of functionalized carbon nanotube were successfully prepared by an in situ polymerization reaction through thermal imidization. The Fourier transform infrared spectroscopy, X-ray diffraction, field emission type scanning electron microscope, transmission electron microscopy, and thermogravimetric analysis techniques were used to evaluate the properties of the novel nanocomposites. According to thermogravimetric analysis results, the addition of the modified multiwalled carbon nanotube improved thermal stability of the obtained hybrid materials. The morphological images show that the carbon nanotubes were dispersed homogeneously in polymer matrix. The mechanical properties of nanocomposites were substantially improved by the incorporation of functionalized carbon nanotube into the polymer matrix.
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