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Preparation of Organic−Inorganic Nanocomposites with a Layered Titanate
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Section:Abstract
Layered nanocomposites with poly(ethylene oxide), PEO, and poly(vinylpyrrolidone), PVP, incorporated between HxTi2-x/4□x/4O4 (□ = Ti vacancy) titanate layers, are synthesized from a colloidal titanate suspension obtained by exfoliation in aqueous tetrabutylammonium hydroxide and subsequent acidification. Products are characterized by powder X-ray diffraction, thermal analyses, FTIR spectroscopy, scanning electron microscopy, and elemental analysis. Interlayer expansions for the vacuum-dried nanocomposites are 0.81 and 2.2 nm for the PEO- and PVP-containing products, respectively. Both nanocomposites are comprised of 10−100-μm diameter platelets, much larger than those of 0.1−1 μm for the starting titanate. FTIR spectra indicate the presence of the polymers and suggest decreased water interaction with titanate sheet surfaces for the polymer-containing products. Thermal analyses of nanocomposites show intercalate water loss below 200 °C, polymer degradation and structure decomposition between 200 and 450 °C, and a titanate phase change above 450 °C. Elemental analyses give empirical formulas of H0.7Ti1.83O4(C2H4O)1.54(H2O)1.28 and H0.7Ti1.83O4(C16H36N)0.05(C6H9NO)1.22(H2O)0.92 for the PEO and PVP nanocomposites, respectively. These results are compared with those obtained for other layered nanocomposites.
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History
- Published In Issue June 18, 2001
- Received February 6, 2001
Revised Manuscript Received April 6, 2001
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0.7; □, vacancy), has been exfoliated on the action of an aqueous solution of tetrabutylammonium (hereafter TBA) hydroxide, which resulted in a stable colloidal suspension. A ...
