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Other TitleCrystal structure transformation and thermal decomposition behavior of ammonium nitrate/potassium nitrate particles containing polymers
Author(jpn)永山, 清一郎; 加藤, 勝美; 東, 英子; 中野, 勝之; 羽生, 宏人
Author(eng)Nagayama, Seiichiro; Katoh, Katsumi; Higashi, Eiko; Nakano, Katsuyuki; Habu, Hiroto
Author Affiliation(jpn)福岡大学; 福岡大学; 福岡大学; 福岡大学; 宇宙航空研究開発機構宇宙科学研究所宇宙飛翔工学研究系(JAXA)(ISAS)
Author Affiliation(eng)Fukuoka University; Fukuoka University; Fukuoka University; Fukuoka University; Division for Space Flight Systems, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Issue Date2014-03-31
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構研究開発報告: 高エネルギー物質研究会: 平成25年度研究成果報告書
JAXA Research and Development Report: Collaborative Research Activity on Energetic Materials Research Report FY2013
Start page23
End page30
Publication date2014-03-31
Abstract硝酸アンモニウム(AN)は吸湿性を有し,室温近傍においても体積変化を伴う固相間相転移が起こるなど工業利用における課題を有する。我々の既往の研究では,これらの問題を解決するため,AN,相安定化剤である硝酸カリウム(PN)およびポリマー(例:PVA,CMC,Latex)が一体化した微粒子(AN/PN/Polymer)を調製し,ポリマーの効果により防湿性が向上することを明らかにした。本研究では,調製したAN/PN/Polymer 微粒子の相転移および熱分解挙動をDSC を用いて観察した。実験の結果,PN の効果により,室温-100 C の温度領域にAN 由来の相転移が観察されず,相安定化していることが確認された。また,PVA およびCMC にもAN に対する相安定化効果がある可能性が示唆された。AN/PN/Polymer の熱分解挙動を観察したところ,190-245 C および272-291 C に2 つの発熱ピークが観察された。低温側の発熱は,AN と融解あるいは熱分解したポリマーとの反応が関係している可能性があり,高温側の発熱はAN 自身の発熱分解に由来するものと推察した。
Ammonium nitrate (AN) has problematic properties for industrial application such as high hygroscopicity and crystal structure transformation accompanied by volumetric change. In our previous studies, we prepared spray-dried particles comprising three components: AN, potassium nitrate (PN) as a phase stabilizer, and polymers (e.g. PVA, CMC, Latex), which was confirmed to provide effective moisture proofing. In the present study, the crystal transformation behavior and the thermal decomposition behavior of AN/PN/Polymer particles were investigated by differential scanning calorimetry (DSC). The results showed that phase-stabilized AN could be successfully prepared by the addition of PN. In addition, an intriguing possibility was identified in that CMCA and PVA, which were both added as polymer components for moisture proofing, also acted as phase stabilizers for AN crystal transformation. When the thermal decomposition behavior was investigated, two exothermic peaks were observed at 190-245 C (first peak) and 272-291 C (second peak) in the result of AN/PN/Polymer. It is possible that the first peaks in the DSC curves for the AN/PN/polymer mixtures result from the reaction of AN with melted PVA, or decomposition products and gases derived from CMC and Latex, and the second peak is due to decomposition of AN on its own.
Description形態: 図版あり
Physical characteristics: Original contains illustrations
KeywordsPhase stabilized ammonium nitrate (PSAN); Crystal transformation; Thermal decomposition; Gas generator; Spray dry
Document TypeResearch Paper
JAXA Category研究開発報告
NASA Subject CategoryPropellants and Fuels
Report NoJAXA-RR-13-009

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