【摘要】 以环氧乙烷 /四氢呋喃无规共聚醚、异佛尔酮二异氰酸酯以及 1,4 -丁二醇为原料 ,采用熔融二步法合成了一种能为硝酸酯增塑并满足推进剂使用要求的热塑性聚氨酯弹性体 (TPU) .采用 GPC,FTIR,DSC和力学性能测试等分析技术对 TPU进行表征 ,结果表明 ,在所选择的硬段含量范围内 ,TPU均具有合理相对分子质量范围内的线性聚醚聚氨酯的结构特征 ;软段相具有能满足推进剂对低温力学性能要求的玻璃化转变温度 (tg<- 50℃ ) ;硬段相具有能满足推进剂特殊加工工艺要求的加工温度 .力学性能测试表明 ,硬段质量分数为 4 5%左右的 TPU具有满足推进剂使用要求的力学性能 (σm>3MPa,εm>50 0 % ) .更多还原

【Abstract】 Nitroester plastisized thermoplastic polyurethanes suitable for novel thermoplastic propellant binders were prepared based on ethylene oxide/tetrahydrofuran random copolyether, isophorone diisocyanate and 1,4 butanediol. Melt prepolymerization method was adopted to synthesize thermoplastic polyurethanes with different fraction of hard segments. GPC,DSC,FTIR and tensile test techniques were applied to make further characterization of the TPU. It was showed that the TPU with 45% fraction of hard segment exhibited excellent integrate properties to meet requirements of propellant in terms of t g of soft segment phase, processing temperature and mechanical properties( σ m>3 MPa, ε m>500%).更多还原