Polymers and Polymer Composites
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Title: Preparation and characterization of an aromatic imidefunctionalized polysilsesquioxane via the sol-gel route
Page Range: p.621-626
Author(s): Schramm C; Rinderer B; Tessadri R
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Issue No: No.9
Phthalic acid (benzene-1,2-dicarboxylic acid, PA) and trimesic acid (benzene-1,3,5-tricarboxylic acid, TA) have been reacted with 3-aminopropyltriethoxysilane (APTES) at 110 deg C and 220 deg C (molar ratios 1:1 and 1:2). The reaction at 110 deg C resulted in the formation of the corresponding poly(amic acid), whereas the thermal imidisation at 220 deg C gives rise to the formation of a cyclic polyimide moiety as shown by means of Fourier transform infrared spectroscopy (FT-IR). X-ray powder diffraction (XRPD) measurements revealed that a specific periodic arrangement in the as-prepared materials had been formed. Thermogravimetric analysis (TGA) made evident that the organic-inorganic nanocomposite materials showed improved thermal properties. The reaction of PA with APTES (1:1) at 220 deg C is assumed to yield a ladder-like polysilsesquioxane. 25 Refs.