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Enhanced Creep Resistance and Mechanical Properties for CL‐20 and FOX‐7 based PBXs by Crystal Surface Modification
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-02-12 , DOI: 10.1002/prep.202000277 Xuelin Yang 1, 2 , Feiyan Gong 2 , Kai Zhang 3 , Wenbin Yang 1 , Chengcheng Zeng 2 , Zhijian Yang 2
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-02-12 , DOI: 10.1002/prep.202000277 Xuelin Yang 1, 2 , Feiyan Gong 2 , Kai Zhang 3 , Wenbin Yang 1 , Chengcheng Zeng 2 , Zhijian Yang 2
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Interfacial strength between energetic crystal and polymeric binder is of a great significance to the mechanical strength and other performances of polymer bonded explosives (PBXs). In this paper, hexanitrohexaazaisowurtzitane (CL‐20) and 1,1‐diamino‐2,2‐ dinitroethylene (FOX‐7) were chosen to study the thermal and mechanical properties of corresponding PBXs. The energetic crystals were firstly modified with polydopamine (PDA) and further coated with the hyperbranched polymer (HBP). The results showed that CL‐20@PDA achieved a noticeable retardation of 11 °C for the phase transition, due to the constraint of PDA shell, and the thermal decomposition of CL‐20 was slightly delayed. The storage modulus of CL‐20 based PBXs were improved. In addition, the tensile strength and compressive strength were increased by 22.9 % and 25.4 %, respectively. Concomitantly, the fracture failure temperature of FOX‐7 based PBXs composites after surface coating were increased, with its tensile and compressive strength increased by 33.1 % and 15.2 %, respectively. Moreover, the creep resistance of the two PBXs composites with surface modification was obviously enhanced.
中文翻译：
通过晶体表面改性增强了基于CL-20和FOX-7的PBX的耐蠕变性和机械性能
高能晶体和聚合物粘合剂之间的界面强度对于聚合物粘结炸药（PBX）的机械强度和其他性能具有重要意义。在本文中，选择六硝基六氮杂异纤锌矿型结构烷烃（CL-20）和1,1-二氨基-2-2,2-二硝基乙烯（FOX-7）来研究相应PBX的热性能和机械性能。首先用聚多巴胺（PDA）修饰高能晶体，然后再用超支化聚合物（HBP）包覆。结果表明，由于PDA壳层的限制，CL-20 @ PDA的相变达到了11°C的明显延迟，并且CL-20的热分解略有延迟。基于CL-20的PBX的存储模量得到了改善。另外，抗张强度和抗压强度分别增加了22.9％和25.4％。同时，FOX-7基PBXs复合材料表面涂层后的断裂破坏温度升高，其抗张强度和抗压强度分别提高了33.1％和15.2％。而且，两种表面改性的PBXs复合材料的抗蠕变性都得到了明显提高。
更新日期：2021-03-31
中文翻译：
通过晶体表面改性增强了基于CL-20和FOX-7的PBX的耐蠕变性和机械性能
高能晶体和聚合物粘合剂之间的界面强度对于聚合物粘结炸药（PBX）的机械强度和其他性能具有重要意义。在本文中，选择六硝基六氮杂异纤锌矿型结构烷烃（CL-20）和1,1-二氨基-2-2,2-二硝基乙烯（FOX-7）来研究相应PBX的热性能和机械性能。首先用聚多巴胺（PDA）修饰高能晶体，然后再用超支化聚合物（HBP）包覆。结果表明，由于PDA壳层的限制，CL-20 @ PDA的相变达到了11°C的明显延迟，并且CL-20的热分解略有延迟。基于CL-20的PBX的存储模量得到了改善。另外，抗张强度和抗压强度分别增加了22.9％和25.4％。同时，FOX-7基PBXs复合材料表面涂层后的断裂破坏温度升高，其抗张强度和抗压强度分别提高了33.1％和15.2％。而且，两种表面改性的PBXs复合材料的抗蠕变性都得到了明显提高。
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