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概要
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Ammonium copper(II) and ammonium calcium <I>cyclo</I>-hexaphosphates, Cu<SUB>2</SUB>(NH<SUB>4</SUB>)<SUB>2</SUB>P<SUB>6</SUB>O<SUB>18</SUB>·8.5H<SUB>2</SUB>O and Ca<SUB>2</SUB>(NH<SUB>4</SUB>)<SUB>2</SUB>P<SUB>6</SUB>O<SUB>18</SUB>·7H<SUB>2</SUB>O, were prepared by a wet method. TG-DTA, HPLC-FIA, and X-ray diffraction method were used to investigate the thermal decomposition of the <I>cyclo</I>-hexaphosphates. The effect of humidity on the pyrolysis was also examined by the use of dry N<SUB>2</SUB> gas and humid air. Cu<SUB>2</SUB>(NH<SUB>4</SUB>)<SUB>2</SUB>P<SUB>6</SUB>O<SUB>18</SUB>·8.5H<SUB>2</SUB>O was mainly decomposed to oligophosphates by hydrolysis. Parts of the oligophosphates were changed to poly- (<I>n</I>=1–13) and highpolyphosphates through a condensation. The poly- and the highpolyphosphates were more abundant under the dried conditions. Above 280 °C ammonia was liberated. As the crystalline products, CU<SUB>2</SUB>P<SUB>2</SUB>O<SUB>7</SUB> was identified at 380 °C, and CU<SUB>2</SUB>P<SUB>4</SUB>O<SUB>12</SUB> above 430 °C. Ca<SUB>2</SUB>(NH<SUB>4</SUB>)<SUB>2</SUB>P<SUB>6</SUB>O<SUB>18</SUB>·7H<SUB>2</SUB>O lost almost all its water of crystallization by 177 °C. As ammonia was evolved from 270 to 420 °C, accelerated by humidity, amorphous highpolyphosphates were formed. The formation of the highpolyphosphates was considered to proceed through a radical polymerization, since oligophosphates were scarcely detected in the course of the thermal reaction.
- 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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Kobayashi Hironobu
Department Of Breast And Endocrine Surgery Nagoya University Hospital
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Tsuchie Katsumi
Department of Industrial Chemistry, Yonago National College of Technology
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