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Nanostructured Energetic Composites of CL-20 and Binders Synthesized by Sol Gel Methods

机译：溶胶凝胶法合成CL-20和粘合剂的纳米结构高能复合材料

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摘要

Monolithic energetic gels were prepared in acetone by sepa-rately cross-linking the single precursors,glycidyl azide polyol (GAPpolyol polyol),nitrocellulose (NC,12% N),and tris(hy-droxymethyl)nitromethane (THMNM)and the mixed precursors (GAP polyol+ NC)and (GAP polyol + THMNM)with hexam-ethylene diisocyanate (HDI),THMNM functions as a chain extender.The synthesis conditions were optimized according to precursor mass ratio,cross-linking agent,solvent,catalyst con-centration,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 hexanitro-hexazaisowurtzitane (CL-20)on the nano scale in the energetic polymer gels using sol gel 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 gels 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.
机译：通过分别交联单个前体，缩水甘油基叠氮化物多元醇（GAPpolyol多元醇），硝化纤维素（NC，12％N）和三（羟甲基）硝基甲烷（THMNM）并在丙酮中制备整体式高能凝胶（GAP多元醇+ NC）和（GAP多元醇+ THMNM）与六亚乙基二异氰酸酯（HDI），THMNM用作扩链剂。根据前驱体质量比，交联剂，溶剂，催化剂浓度优化了合成条件最重要的因素是反应物和固化催化剂的浓度。通过将六硝基六氮杂异纤锌矿型结构烷烃（CL-20）捕获在纳米颗粒上，合成了具有高均匀度的复合含能材料。使用改良的冷冻干燥程序，通过溶胶凝胶工艺在高能聚合物凝胶中进行大规模制备。分别负载高达85％，93％和90％重量的CL-20，用于GAP / HDI，NC / HDI的整体式凝胶，THMNM / HDI.90％CL-20可以（GAP多元醇+ NC）和（GAP多元醇+ THMNM）的混合前体的凝胶。使用FT-IR光谱，DSC，SEM和对落锤冲击的敏感性来表征高能凝胶和复合材料。高能纳米复合材料中-20被还原。

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