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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >Thermal ageing of rocket propellant formulations containing epsilon-HNIW (epsilon-CL20) investigated by heat generation rate and mass loss
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Thermal ageing of rocket propellant formulations containing epsilon-HNIW (epsilon-CL20) investigated by heat generation rate and mass loss

机译：通过产热率和质量损失研究了包含ε-HNIW（epsilon-CL20）的火箭推进剂配方的热老化

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New types of rocket propellant batches have been formulated with the objective of achieving higher burning rates. The main ingredients are (1) the energetic plasticizers glycidyl azide polymer-alpha,omega-diazide (GAP)-A (short chain GAP with azide end groups), trimethylolethane trinitrate (TMETN) and 1,2,4-butanetriol trinitrate (BTTN), (2) the energetic substances ammonium perchlorate (AP) and epsilon-CL20 (epsilon-HNIW, hexanitrohexazaisowurtzitane, crystallised in E-phase). The binder is GAP (glycidyl azide polymer, diol component) cured with the polyisocyanate Desmodur(TM) N100. From the point of view of stability and ageing, the interesting fact is that the formulations contain none of the typical stabilisers for the nitric acid ester components TMETN and BTTN, although their contents range up to 21 mass%. One reason for doing so is to increase the content of the high energy ingredients. Seven formulations were examined in more detail. To assess basic stability the autoignition temperature test, Dutch mass loss test and vacuum stability test were used. To investigate ageing, two measurement quantities are applied: heat generation rate (heat flow) as function of time at 70, 80 and 89degreesC and mass loss as function of time at the temperatures of 70, 80 and 90degreesC. The evaluation of the measurements was done with reaction kinetic models. One batch (#189) containing BTTN shows significantly lower activation energy and pre-exponential factor. From mass loss one gets as activation energy for #189 of 101 kJ mol(-1) in comparison to the range of 126-135 U mol(-1) for the six other batches. But, based on the ageing caused by chemical decomposition reactions, all seven batches showed a good ageing behaviour. A use time period of up to 20 years of use seems realistic. (C) 2003 Published by Elsevier Science B.V. [References: 12]
机译：为了实现更高的燃烧速率，已经配制了新型的火箭推进剂批料。主要成分是（1）高能增塑剂缩水甘油基叠氮化物聚合物-α，ω-二叠氮化物（GAP）-A（带有叠氮化物端基的短链GAP），三羟甲基乙烷三硝酸盐（TMETN）和1,2,4-丁三醇三硝酸盐（BTTN） ），（2）高能铵（AP）和epsilon-CL20（ε-HNIW，六硝基六氮杂异纤锌矿型结构烷烃，在E相中结晶）。粘合剂是用多异氰酸酯DesmodurTM N100固化的GAP（缩水甘油叠氮化物聚合物，二醇成分）。从稳定性和老化的观点来看，有趣的事实是该制剂不包含硝酸酯组分TMETN和BTTN的典型稳定剂，尽管它们的含量最高为21质量％。这样做的原因之一是增加高能成分的含量。七个配方进行了更详细的检查。为了评估基本稳定性，使用了自燃温度测试，荷兰质量损失测试和真空稳定性测试。为了研究老化，应用了两个测量量：在70、80和89摄氏度下，发热率（热流）与时间的关系;在70、80和90摄氏度下，质量损失与时间的关系。用反应动力学模型进行测量的评估。一批含BTTN的（＃189）的活化能和指数前因子显着降低。由于质量损失，与其他六个批次的126-135 U mol（-1）范围相比，＃189的活化能为101 kJ mol（-1）。但是，基于化学分解反应引起的老化，所有七个批次均显示出良好的老化行为。长达20年的使用时间似乎是现实的。 （C）2003年由Elsevier Science B.V.出版[参考文献：12]

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