中文摘要：

以甲苯二异氰酸酯（TDI）、聚氧化丙烯多元醇（TDB-2000和TMN-450）、双羟甲基丙酸（DMPA）和丁二醇（BDO）为原料，采用丙酮回流法合成了硬段质量分数为45％的支化水性聚氨酯（WBPU），用FT-IR、^1HNMR及DSC对所得产物进行表征。FTIR和^1HNMR图谱显示，所得产物为目标化合物；DSC测试结果显示，合成的支化水性聚氨酯树脂在299℃和380℃出现分解吸热双峰；SEM和FT-Raman光谱显示，制备的支化水性聚氨酯乳液采用破乳法对六硝基六氮杂异伍兹烷（HNIW）进行了包覆；撞击感度试验显示，HNIW包覆后的特性落高由25．1cm提高到31．6cm，表明支化性聚氨酯能降低HNIW的冲击感度。

英文摘要：

The waterborne branched polyurethane （WBPU） was synthesized from toluene diisocyanates （TDI）, TDB-2000, TMN-450, dimethylolpropionic acid （DMPA） and 1,4-butanediol （BDO） as raw materials under acetone reflux. The cast films obtained were characterized by FT-IR, ^1HNMR and DSC. The DSC curve presented an endothermic decomposition bimodal profile, showing that water-borne branched polyurethane resin degraded obviously at about 299 ℃ and 380 ℃. The SEM photographs and FT-Raman spectra revealed that hexanitrohexaazaisowurtzitane （HNIW） was coated with water-borne branched polyurethane by means of latex deposition. The impact sensitivity results show that the characteristic height H50 of HNIW coated by water-borne branched polyurethane increases from 25.1cm to 31.6cm, indicating that the water-borne branched polyurethane can decrease the impact sensitivity of HNIW.