热塑性聚氨酯弹性体及推进剂生成焓的估算

Estimation of formation enthalpy of thermoplastic polyurethane binder for novel thermoplastic propellant

为了解决以热塑性聚氨酯 (TPU)为粘合剂制备的新型热塑性推进剂配方能量的计算问题 ,以VanKrevelen和Chermin等人的基团估算方法及数据为基础 ,结合高分子内聚能的概念 ,从理论上探索了一条估算热塑性聚氨酯生成焓的方法 ,得到了TPU的生成焓与硬段含量之间的关系式 ,并对 45 %TPU/Al/AP复合热塑性推进剂的能量水平进行了计算。计算表明 :体系组成为TPU/AP/Al=14/ 6 2 / 2 4时 ,出现整个配方体系的最大理论比冲2 5 9kN·s/kg。

In order to calculate the specific impulse of novel propellant with thermoplastic polyurethane (TPU) synthesized as binder, method and data developed by Van Krevelen and Chermin together with the theory of cohesive energy of polymers, were applied to estimate the formation enthalpy of TPU Relationship between formation enthalpy and content of hard segment of TPU was quantitatively obtained Results of formation enthalpy of TPU were then adopted to calculate the energetic performances of TPU/aluminum/ammonium perchloride propellant system Results show that specific impulse reaches the maximum value as 2 59 kN·s/kg when the system consists of 14% TPU, 62% AP , 24% Al