－ －31The Eect of Temperature and Humidity on the Thermal Characteristics of Tetrazole DerivativesSatoru YOSHINO, Tomoe KOMORIYA, Keiichi SAKAMOTOEnergetic materials such as nitrates and azole compounds are used as gas generating agents for airbag systems, whereby the bag expands due to the combustion generated gas of the gas generator. Gas generating agents are installed in auto-mobiles for a long period of time, and they are required to reliably generate gas in the event of an emergency. Therefore, it is important to understand the stability of the gas generating agents in the environmental conditions to which they are exposed. To examine the stability of a sample due to temperature and humidity, an accelerated test is conducted in which the substance is exposed to severe conditions, and the thermal characteristics and chemical structure of the sample before and after exposure are confirmed. The target materials were 5,5’-bistetrazole diammonium salt (BHT) and 5-aminotetrazole (HAT), which have been used as gas generating agents. The samples were exposed to a constant temperature and humidity chamber, and the characteristics of the samples before and after exposure were examined by thermal analysis and spectroscopic analysis. The exposure conditions (temperature and humidity) were 30°C, 85% RH and 85°C, 85% RH, and each sample was exposed for 14 days. It was found that BHT had a small effect on the thermal properties due to humidity, and HAT changed its chemical structure when exposed to high humidity conditions.Keywords: tetrazole derivatives, humidity testing, temporal stability, thermal analysis, FT-IRテトラゾール誘導体の熱的特性に及ぼす温度および湿度の影響 エアバッグ用ガス発生剤は硝酸塩およびアゾール化合物のエネルギー物質が用いられ、ガス発生剤の燃焼発生ガスでバッグが膨張する。ガス発生剤は自動車に長期間搭載され、有事の際に確実にガスを発生することが求められる。したがって、ガス発生剤が暴露される環境条件における安定性を把握することが重要である。温度および湿度に対する安定性を検討するため、過酷な条件下に物質を暴露する加速試験を実施し、暴露前後で熱特性および化学構造の確認を行う。 ガス発生剤として利用実績のある5,5’-ビステトラゾールジアンモニウム塩(BHT)および5-アミノテトラゾール(HAT)を対象物質とし、恒温・恒湿の環境チャンバーにサンプルを暴露し，暴露前後のサンプルを熱分析および分光分析により特性を検討した。暴露条件は，温度30℃-湿度85％RHおよび温度85℃-湿度85％RHとし，それぞれ14日間暴露した。BHTは湿度による熱的特性への影響は小さく，HATは高湿度条件への暴露によりHATの化学構造が変化することがわかった。キーワード：テトラゾール誘導体，湿度試験，経時安定性，熱分析，フーリエ変換-赤外分光法Journal（掲載誌）The eect of temperature and humidity on the thermal characteristics of tetrazole derivatives, International Journal of Energetic Materials and Chemical Propulsion, 20(1), 67-75 (2021)Published Paper
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