静电组装低感度CL-20@GO核壳复合材料的制备及性能研究

Preparation and Performance of Low Sensitivity CL-20@GO Core-shell Composites by Electrostatic Assembly

为降低六硝基六氮杂异伍兹烷(CL-20)的机械感度,提高其综合性能,以3-氨丙基三乙氧基硅烷(APS)为改性剂对CL-20改性,以氧化石墨烯(GO)为包覆材料,利用静电自组装方法对改性CL-20炸药进行表面包覆,制备得到CL-20@GO核壳复合材料;采用水接触角测试、扫描电子显微镜(SEM)和X射线光电子能谱(XPS)等对样品进行形貌表征;利用差示扫描量热仪(DSC)测试其热性能,并测试了其机械感度。结果表明,经质量分数5%的APS溶液改性的CL-20成功引入氨基基团,亲水性效果最佳;GO层包覆改性CL-20完整,致密性强;与原料CL-20相比,CL-20@GO核壳复合材料的活化能提高了63.0kJ/mol,撞击感度(H 50)由13.0cm提升至23.5cm,摩擦感度由100%降至24%,表明采用静电自组装的GO涂层可以明显降低CL-20的感度。

To reduce the mechanical sensitivity and improve the comprehensive performance of hexanitrohexaazaisowurtzitane(CL-20),3-aminopropyltriethoxysilane(APS)was used as the modifier to modify the surface of CL-20,and graphite oxide(GO)was used as the coating material,CL-20@GO core-shell composite was prepared by electrostatic self-assembly.The tissue morphology of the prepared samples was characterized by water contact angle test,scanning electron microscope(SEM)and X-ray photoelectron spectroscopy(XPS).The thermal performance was tested by differential scanning calorimeter(DSC),and the mechanical sensitivity was tested.The results show that the CL-20 modified by 5%(mass fracton)APS solution has the strongest hydrophilic,indicating the successful introduction of amino groups.The CL-20 particles are coated by GO layer completely.Compared with the raw CL-20,the activation energy of CL-20@GO composite increases by 63.0kJ/mol,the impact sensitivity(H 50)increases from 13.0cm to 23.5cm,and the friction sensitivity decreases from 100%to 24%,showing that the coating of GO by electrostatic self-assembly can significantly reduce the sensitivity of CL-20.