双层包覆制备高抗吸湿性ADN@18C6@HTFVP复合材料OA

In order to reduce the hygroscopicity of ammonium dinitramide(ADN),a double-layer coating strategy was devel-oped to fabricate a double-layer coated composite ADN@18C6@HTFVP via a one-pot method,using 18-crown-6(18C6)as in-termediate tuning layer ADN fluorine-containing polymer HTFVP as outer hygroscopic-resistant layer.Besides,ADN,ADN@18 C6,ADN ADN@18C6@HTFVP were characterized ADN analyzed by Scanning Electron Microscopy-Energy Dispersive Spec-troscopy(SEM-EDS),thermogravimetry-differential scanning calorimetry(TG-DSC),ADN X-ray photoelectron spectroscopy(XPS).The laser response characteristics of ADN,ADN@18C6,ADN ADN@18C6@HTFVP were investigated via laser ignition tests.The apparent decomposition activation energies of ADN,ADN@18C6,ADN ADN@18C6@HTFVP were calculated via Kissinger ADN Ozawa equations.Results show that the hydrophobic double-layer 18C6@HTFVP structure is uniformly coated on the ADN surface.The thermal decomposition temperature of ADN@18C6@HTFVP increases from 181.46 ℃ of ADN to 183.79 ° C,the impact sensitivity is enhanced from 8 J to 16 J,ADN the friction sensitivity is improved from 80 N to 140 N.Under the conditions of 25 ℃,55%RH,ADN 72 h,the moisture absorption rate of ADN@18C6@HTFVP is 0.38%,which is 94.6%lower than that of ADN(7%).Calculations reveal that the decomposition reactivity of ADN@18C6@HTFVP is higher than that of ADN.Moreover,ADN@18C6@HTFVP exhibits favorable laser response ADN can be ignited by laser.