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Original Articles

Study on the crystal transformation of ammonium polyphosphate crystalline form V

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Pages 1306-1312 | Received 13 Jan 2016, Accepted 27 Apr 2016, Published online: 21 Jul 2016
 

GRAPHICAL ABSTRACT

ABSTRACT

The crystal transformation of ammonium polyphosphate crystalline form V (APPv) was studied. The effects of heating time and water content in the reactor were explored. The results showed that APPv underwent complete conversion to crystalline form II (APPii) when heated at 200°C. The pure and water-insoluble APPii was obtained under the alternate wet ammonia and dry ammonia atmosphere. Then, the thermal behavior of APPv and APPii was investigated. The TG analysis showed APPv had high thermal stability over the range of 300°C to 580°C, which was possibly due to its highly cross-linked structures.

Funding

This work was supported by the Shanghai Municipal Science and Technology Commission (15195800700).

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