中文摘要：

采用丙酮回流法合成了乳化能力较好、硬段含量为45％的水性聚氨酯，用FTIR表征了所得产物，用激光粒度分析仪测试了乳液粒径分布范围为0．2～2．3μm，属于部分水溶性的胶态分散液。DSC测试显示该水性聚氨酯树脂在227℃开始分解，263、379℃出现双分解吸热峰，分别隶属于硬段和软段的分解。将合成水性聚氨酯包覆CL-20用FT Raman光谱和SEM表征证明包覆成功，且包覆后的CL-20的撞击感度H50提高近40％。

英文摘要：

The waterborne polyurethane （ WPU ） emulsions were synthesized with toluene diisocyanates （TDI） , poly （ propylene glycol） （PPG） , dimethylolpropionic acid （DMPA） and 1,4-butanediol （ BDO ） under acetone reflux, and characterized by Fourier transform infrared （FTIR） , differential scanning calorimetry （DSC） , and particle size distribution measurements. It shows that the particle size distribution of emulsion is 0.2-2.3 μm, the waterborne polyurethane resin degraded obviously at 263 ℃ and 379 ℃attributes to the degradation of hard segment and soft segment respectively, which is an endothermic course. The scanning electron microscopy （SEM） images and FT-Raman spectra reveal that CL-20 is successfully coated by waterborne polyurethane. The impact sensitivity experimental results indicate that the characteristic height H50 of CL-20 coated by WPU is increased by 40 percent.