• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Energetic Materials: Performance and Safety >CRYSTALLIZATION AND CHARACTERIZATION OF 1,1-DIAMINO-2,2-DINTROETHENE (DADNE)
【24h】

CRYSTALLIZATION AND CHARACTERIZATION OF 1,1-DIAMINO-2,2-DINTROETHENE (DADNE)

机译：1,1-二氨基-2-2,2-丁二烯（DADNE）的结晶和表征

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Crystallization of DADNE from water, acetone and DMF was carried out, and the solubility curve of DADNE/water system was determined. It turned out that water can be used for DADNE crystallization and purification. Samples recrystallized under different conditions (cooling crystallization, antisolvent crystallization) were tested by means of TGA/DTA and X-ray diffraction. The results obtained have shown that DADNE crystallizes in the α-form, regardless the solvent type and the method of solution supersaturation. Cooling crystallization provides crystals with solvent inclusions that are characterized by a lower density and thermal stability. The purest material was obtained by pouring hot DADNE solutions into cold water. Regardless the crystallization conditions, the amount of DADNE which undergoes decomposition in the first stage (on heating up to 230℃) was almost the same ((29)/(32)%). The product of the partial decomposition has similar (but not identical with DADNE) ~1H NMR spectrum and elemental composition. Its XRD pattern corresponds to the γ-phase, stable at temperatures above 180℃, so that after partial decomposition, γ-DADNE is stable even at room temperatures.
机译：进行了DADNE在水，丙酮和DMF中的结晶，并确定了DADNE /水体系的溶解度曲线。事实证明，水可用于DADNE的结晶和纯化。通过TGA / DTA和X射线衍射测试了在不同条件下重结晶的样品（冷却结晶，抗溶剂结晶）。所得结果表明，无论溶剂类型和溶液过饱和方法如何，DADNE都以α形式结晶。冷却结晶使晶体具有溶剂夹杂物，其特征在于较低的密度和热稳定性。通过将热的DADNE溶液倒入冷水中可获得最纯的材料。无论结晶条件如何，在第一阶段（加热到230℃时）分解的DADNE的量几乎相同（（29）/（32）％）。部分分解的产物具有相似的（但与DADNE不同）〜1H NMR光谱和元素组成。它的XRD图谱与γ相相对应，在180℃以上的温度下稳定，因此，γ-DADNE在部分分解后即使在室温下也稳定。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号