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概要
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Ammonium <I>cyclo</I>-hexaphosphate 1.5-hydrate (NH<SUB>4</SUB>)<SUB>6</SUB>P<SUB>6</SUB>O<SUB>18</SUB>·1.5H<SUB>2</SUB>O was prepared. Under conditions similar to those in the thermal analysis (TG–DTA), the hydrate was heated in an electric furnace. The atmospheres used then were streams of humid air, dried air and dry ammonia gas. The products were characterized by the X-ray diffraction method and by HPLC-flow injection analysis (HPLC-FIA). The thermal decomposition of anhydrous ammonium <I>cyclo</I>-tetraphosphate (NH<SUB>4</SUB>)<SUB>4</SUB>P<SUB>4</SUB>O<SUB>12</SUB> was also investigated. From each ammonium <I>cyclo</I>-phosphate, very analogous ammonium polyphosphate was produced. Its formation was considered to result from the polymerization of some lower-condenced phosphate radicals, which were generated on the cleavage of the ring anions of the <I>cyclo</I>-phosphates. The radicals incorporated water molecules in the atmosphere, which causes less formation of the ammonium polyphosphate and exhibited a TG gain and an exothermal DTA break. The exotherm could be attributed theoretically to the incorporation in case of the <I>cyclo</I>-tetraphosphate. Moreover, the release of ammonia from the starting material was supposed to be a trigger for the cleavage of the ring anions.
- 公益社団法人 日本化学会の論文
著者
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NARIAI Hiroyuki
Department of Chemical Science and Engineering, Faculty of Engineering, Kobe University
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MOTOOKA Itaru
Department of Chemical Science and Engineering, Faculty of Engineering, Kobe University
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Takenaka Atsushi
Department Of Urology Hyogo Medical Center For Adults
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Motooka Itaru
Department of Chemistry, Faculty of General Education, Kobe University
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