中文摘要：

以纳米级2,6-二氨基-3,5-二硝基吡嗪-1-氧化物（LLM-105）为原料,采用溶剂诱导自组装法制备了横截面为矩形的LLM-105微米棒,并将制备的矩形LLM-105微米棒与直接合成的孪晶LLM-105样品进行了对比分析。研究了溶剂、纳米级LLM-105加入量、搅拌速率和自组装时间对自组装后LLM-105晶体形貌的影响,得到了最优自组装条件,发现以二甲基亚砜（DMSO）为溶剂,纳米LLM-105的加入量为40 g·L^（-1）,搅拌速率为600 r·min^（-1）时以纳米LLM-105为原料自组装可得到规则的矩形棒状晶体,并提出了其可能的生长机理。采用扫描电子显微镜,X射线粉末衍射,差示扫描量热-热重,高效液相色谱分别对自组装后晶体的形貌、结构、热性能以及纯度进行了表征,发现自组装矩形LLM-105微米棒与直接合成的孪晶LLM-105相比,XRD主要衍射峰完全一致,但在2θ为11.1°、22.3°、24.8°和33.0°处的衍射峰强度有所降低,晶体可能沿着（100）方向择优生长;晶体纯度提高了1.8%,达到为98.8%;自组装制备得到的微米LLM-105晶体具有更好的热稳定性,仅存在356.7℃一个放热峰,热失重起始温度提高了34.8℃。

英文摘要：

The 2,6-diamino-3,5-dinitropyrazine-1-oxide（ LLM-105） micro-rods with cross section of rectangular were prepared by solvent-induced self-assembly process using nano-LLM-105 as raw materials. And the LLM-105 twin crystal synthesized directly were compared. The effects of solvent,nano-LLM-105 addition,stirring rate and self-assembly time on the crystal morphology of LLM-105 prepared by self-assembly were studied and the possible growth mechanism of rectangular micro-rods was proposed. The morphology,structure,thermal property and purity of crystals prepared by self-assembly were characterized by scanning electron microscopy,X-ray powder diffraction,different scanning calorimetry-thermogravimetry and high performance liquid chromatography. Results show that the regular rectangular micro-rods are assembled under the optimal conditions with dimethylsulfoxide as solvent,nano-LLM-105 addition of 40 g·L~（- 1）,stirring rate of 600 r·min~（- 1）. Comparing to LLM-105 twin crystals synthesized directly,the assembled regular rectangular micro-rods have the same diffraction peaks,but the intensities weaken at 11. 1°,22. 3°,24. 8°,and 33. 0°,which indicates that the crystal may be preferred to grow in the direction of the（ 1 0 0）,and,its purity was improved by 1. 8% to 98. 8%. The regular rectangular rod-like crystals exhibit better thermal stability with only one exothermic peak of 356. 7 ℃,and the thermo-gravimetric starting temperature（ 266. 3 ℃） improves by 34. 8 ℃ compared with 231. 5 ℃ of LLM-105 twin crystals.