Preparation and Characterization of Organic Gel-Inorganic Oxidizers Energetic Nanocomposites
Two types of polymeric sols: resorcinol-formaldehyde (RF) and resorcinol-furfural (RFur) were mixed in water-containing medium with water solution of inorganic salts NH4CIO4, LiClQ4, Mg(ClO4)2 and NH4NO3. After gelation and drying, hybrid nanocomposites with properties of energetic materials were obtained. It was stated that salt concentration and addition of second solvent (e.g. methanol or N, N-dimethylformamide) to the mixture of reagents have crucial meaning for gel formation. In the case when only water was used, mixture of organic sol/inorganic salt did not transfer from sol to gel, and precipitates were formed. Conventional drying of wet gelled composites leads to rigid material called xerogels. The RF xerogels are red and RFur xerogels are black. Typically, xerogels are transparent at low salt concentration (>30％). The microstructure, morphology and some other properties of chosen composites were studied by means of HR SEM, AFM, XRD, DTA/TG, and N2 adsorption isotherm techniques. SEM observation revealed that sizes of the oxidizer particles vary from less than 100nm to c.a. 1000nm. XRD analyses also confirmed the presence of nanometer-sized crystals of oxidizers in some formulations. The specific surface area of polymeric matrix/oxidizer composites was found to be in range from 0.002 to 0.3m2/g. After removing the salt from the composites (by extraction with boiling water; the specific surface area grows even up to 210m2/g. TG/DTA analyses showed that the tested composites decompose as typical energetic materials. If pre- heated and exposed to flame, some of them (especially RF/Mgt(ClO4)2 composites) undergo violent deflagration with loud sound and flash effect.
sol-gel synthesis energetic nanocomposites
Stanislaw CUDZILO Wojciech KICINSKI
Institute of Chemistry, Military University of Technology, Kaliskiego 2 Str., 00-908 Warsaw, Poland
国际会议
西安
英文
102-108
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）