端羟基叠氮缩水甘油醚原位包覆纳米铝粉的长储稳定性

To improve the storage stability of aluminum nanoparticles, an in-situ coating strategy was employed to prepare glycidyl azide polymer (GAP) coated aluminum nanoparticles. The morphology, composition and structure of the sample were characterized by using a scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive spectrometer (EDS), powder X-ray diffraction (PXRD) and infrared spectrometer (FTIR), and the calorimeter, vacuum stability measurement and optical contact angle meter were employed to measure the combustion heat, vacuum stability, the contact angle with distilled water, and the moisture absorption performance of the sample. The results showed that GAP-coated aluminum nanoparticles were in the shape of a sphere with diameter of 110nm, and GAP was uniformly coated on the surface of the aluminum. The characteristic FTIR peaks of GAP were at the same wavenumbers before and after coating, and it indicated that the coating process was a physical process. The combustion heat of GAP-coated aluminum was 25.07kJ/g, which was 6% larger than that of uncoated aluminum. The gas generation amount of GAP coated aluminum was 1.776mL/g, which showed good vacuum stability for long-term storage. The contact angle of GAP-coated aluminum was increased from 48.17° to 70.89°, demonstrating its good infiltration behaviors. The mass gain percentage at moisture absorption of the sample increased by 0.36%, much less than that of the uncoated one, showing that the storage stability of GAP-coated aluminum was improved.