Nanostructured energetic composites of CL-20 and binders synthesized by sol gel methods
Nanostructured energetic composites of CL-20 and binders synthesized by sol gel methods
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DOI：
10.1002/prep.200600010
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发表时间：
2006-02-01
影响因子：
1.8
通讯作者：
Brill, TB
中科院分区：
文献类型：
--
作者：
Li, J;Brill, TB
将缩水甘油叠氮多元醇(GAP多元醇)、硝化棉(NC，12%N)和三羟甲基硝基甲烷(THMNM)及其混合前驱体(GAP多元醇+NC)和混合前驱体(GAP多元醇+THMNM)分别与六亚甲基异氰酸酯(HDI)进行交联，在丙酮中制备了整体式含能凝胶。THMNM起到扩链剂的作用。根据前驱体质量比、交联剂、溶剂、催化剂浓度和不同表观体积比的容器对合成条件进行了优化。反应物和固化催化剂的浓度是最重要的影响因素。将六硝基六氮杂异伍兹烷(CL-20)包埋在含能聚合物凝胶中，采用溶胶-凝胶法制备了具有高度均匀度的复合含能材料。当CL-20的负载量分别为85%、93%和90%时，可得到GAP/HDI、NC/HDI和THMNM/HDI的整体凝胶。在(GAP多元醇+NC)和(GAP多元醇+THMNM)混合前驱体凝胶中可以负载90%的CL-20。用红外光谱、差示扫描量热仪、扫描电子显微镜和落锤冲击感度对含能GET和复合材料进行了表征。在含能纳米复合材料中，CL-20的感度降低。
Monolithic energetic gels were prepared in acetone by separately cross-linking the single precursors, glycidyl azide polyol (GAP polyol polyol), nitrocellulose (NC, 12% N), and tris(hydroxymethyl)nitromethane (THMNM) and the mixed precursors (GAP polyol + NC) and (GAP polyol + THMNM) with hexamethylene iisocyanate (HDI). THMNM functions as a chain extender. The synthesis conditions were optimized according to precursor mass ratio, cross-linking agent, solvent, catalyst concentration, and containers with various surface-to-volume ratios. The concentrations of reactants and cure catalyst are the most important factors. The composite energetic materials with a high degree of homogeneity were synthesized by trapping hexanitrohexazaisowurtzitane (CL-20) on the nano scale in the energetic polymer gels using sol get processing with a modified freeze-drying procedure. Loadings up to 85%, 93%, and 90% by weight of CL-20 yielded, respectively, monolithic gels for GAP/HDI, NC/HDI, and THMNM/HDI. 90% CL-20 can be loaded into gels of the mixed precursors of (GAP polyol + NC) and (GAP polyol + THMNM). The energetic gets and composites were characterized using FT-IR spectroscopy, DSC, SEM, and sensitivity to drop weight impact. The sensitivity of CL-20 is reduced in the energetic nanocomposites.