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含能材料  2015 

多孔网状HMX的制备与表征

DOI: 10.11943/j.issn.1006-9941.2015.06.018

Keywords: 奥克托今(HMX) 二甲基亚砜(DMSO) 多孔网状 比表面积 孔隙率

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Abstract:

将奥克托今(HMX)溶于二甲基亚砜(DMSO)中, 获得HMX/DMSO络合物晶体, 再将其分别加入蒸馏水和含聚乙烯吡咯烷酮(PVP)的溶液中, 制备了A类多孔网状HMX(PHMX-A)和B类多孔网状HMX(PHMX-B)。用扫描电子显微镜(SEM)、X射线粉末衍射仪(XRD)、压汞分析仪及TG-DSC热分析仪对多孔网状HMX进行了表征。结果表明:多孔网状HMX由众多的孔和均匀连续的骨架构成, 具有高的比表面积和孔隙率。PHMX-A全部为β型晶体, 其比表面积为5.3 m2·g-1, 平均孔径为501 nm, 孔隙率为56.1%;而PHMX-B有80%为β型晶体, 含少量的γ型晶体, 其比表面积为19.0 m2·g-1, 平均孔径为75 nm, 孔隙率为37.2%。与HMX原料相比, PHMX-A和PHMX-B的相转变温度分别提前了2.8 ℃和17.5 ℃, 其热分解温度分别提前了0.3 ℃和1.3 ℃, 而其热失重开始温度分别提前了4 ℃和14 ℃

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