研究了在热塑性聚氨酯弹性体 (TPU )软段中引入聚乙二醇 (PEG) ,以改善与硝酸酯的混溶能力。通过控制 PEG的相对分子质量和含量 ,可使硝酸酯与 TPU的混溶比大于 4。采用溶剂法挤压成型工艺成功地制成了硝酸酯增塑的 TPU推进剂。此类推进剂的理论比冲为 2 598N· s/kg～ 2 648N· s/kg,燃烧性能优良 ,空白配方的压力指数为 0 .36,常、低温力学性能优异 ,可为硝酸酯增塑 ,加工温度较低。该推进剂是一个可以实现以挤压工艺生产的复合推进剂新品种 ,具有良好的应用前景。此外 ,对推进剂的热分解性能也进行了研究 The introduction of polyethylene glycol (PEG) into the soft segment of thermoplastic polyurethane elastomer (TPU) was studied to improve the miscibility with nitrate. By controlling the relative molecular weight and content of PEG, the miscibility ratio of nitrate ester to TPU is greater than 4. The nitrile ester plasticized TPU propellant was successfully prepared by the solvent extrusion process. The theoretical specific impulse of these propellants is from 2 598 N · s / kg to 2 648 N · s / kg, the combustion performance is excellent, the pressure index of blank formulation is 0.36, and the mechanical properties of normal and low temperature are excellent. , Processing temperature is lower. The propellant is a new composite propellant which can be produced by the extrusion process, and has good application prospect. In addition, the thermal decomposition properties of propellants have also been studied