Surface modified Al sub( 2 )O sub( 3 ) in fluorinated polyimide/Al sub( 2 )O sub( 3 ) nanocomposites: Synthesis and characterization

• Published in: Bulletin of materials science 2012-11, Vol.35 (6), p.925-931
• Main Authors: Ghezelbash, Zivar, Ashouri, Davoud, Mousavian, Saman, Ghandi, Amir Hossein, Rahnama, Yaghoub
• Format: Article
• Language: English
• Subjects: Aluminum; Fluorination; Nanocomposites; Nanoparticles; Nanostructure; Polyimide resins; Scanning electron microscopy; Thermogravimetry
• ISSN: 0250-4707; 0973-7669
• DOI: 10.1007/s12034-012-0385-4

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 sub( 2 )O sub( 3 )) was treated with a silane coupling agent of $\boldsymbol{\gamma} $-aminopropyltriethoxysilane (KH550), which introduces organic functional groups on the surface of Al sub( 2 )O sub( 3 ) nanoparticles. Then fluorinated polyimide (PI) was synthesized from 4,4 super( ' )-(hexafluoroisopropylidene) diphthalic anhydride and 4,4 super( ' )-diaminodiphenylsulfone. Finally, PI/modified Al sub( 2 )O sub( 3 ) nanocomposite films having 3, 5, 7 and 10% of Al sub( 2 )O sub( 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 sub( 2 )O sub( 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.