Abstract
The behavior of polymer-salt compositions consisting of water-soluble nonionogenic polymers and salts containingd-metal-oxygen anions was studied in the range 20-700°C by thermal analysis, conductometry, optical microscopy, x-ray diffraction, and dilatometry. The salts used were ammonium heptamolybdate, ammonium B-paratungstate, and ammonium metavanActate and the polymers were poly(vinyl alcohol), polyvinylpyrrolidone, and methyl cellulose. The films prepared by drying the precursor compositions were found to retain, during heating, the polymer-salt molecular complexes formed at room temperature. The mechanism of the thermal destruction of the salts in the polymer-salt films was shown to differ from that in pure salts because, in the films, mutual stabilization of the polymer and salt took place. In the polymer-salt compositions, oxides were formed directly from amorphous precursors, without formation of intermediates, characteristic of the decomposition of pure salts. The oxides thus prepared consisted of fine particles and exhibited photochromic effect due to partial reduction of metal ions.
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Ostroushko, A.A., Mogil’nikov, Y.V. & Popov, K.A. Thermal destruction of polymer-salt compositions containingd-metals in the form of oxygen-bearing anions. Inorg Mater 36, 603–611 (2000). https://doi.org/10.1007/BF02757963
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DOI: https://doi.org/10.1007/BF02757963