Preparation and properties of a novel covalently bonded energetic boron powder and its composite

Abstract

Promoting the ignition of boron powders in propellants, explosives and pyrotechnics has been a promising research direction.

Superelastic, Breathable, and High-Barrier Nanofibrous Membranes with Biomimetic ECM Structure for Toxic Chemical Protection

“…As shown in Figure e, the absorption peaks at 1025 cm –1 and 1731 cm –1 stand for the CO and CO telescopic vibration of the ester group from the TPU molecular chain. Also, the absorption peak at 2271 cm –1 , ascribed to the isocyanate group (NCO) telescopic vibration of the HMDIC, disappeared from the cross-linked TPU/FPU NMs; that is, the cross-linked structure of the TPU/FPU NMs was produced by the isocyanate group of the HMDIC and urethane group from TPU . To further demonstrate the cross-linking approach, the peak-fit processing on the C1 peak of XPS was carried out and the resultant mapping as shown in Figure f.…”

“…Also, the absorption peak at 2271 cm −1 , ascribed to the isocyanate group (N CO) telescopic vibration of the HMDIC, disappeared from the cross-linked TPU/FPU NMs; that is, the cross-linked structure of the TPU/FPU NMs was produced by the isocyanate group of the HMDIC and urethane group from TPU. 42 To further demonstrate the cross-linking approach, the peak-fit processing on the C1 peak of XPS was carried out and the resultant mapping as shown in Figure 2f. The peaks at 285.0, 286.5, 288, 289.5, 292.0, and 294.5 eV were ascribed to the −C−C, C−O, C−N, OCO, −CF 2 , and −CF 3 , respectively.…”

Simulation study on action mechanism of bonding agent for boron potassium nitrate based on material studio

“…It can burn rapidly under the action of initial impulse energy, release a large amount of heat, gas and burning solid particles, and ignite various gunpowder charges. It has the advantages of high combustion calorific value, strong ignition ability, low hygroscopicity, safety and insensitivity, and less environmental impact [4][5][6][7] .However, the solid phase in the combustion products of potassium borate ignition powder is relatively large, the specific volume is small, and the ignition pressure is low. Previous studies have found that when potassium borate nitrate is prepared by mechanical mixing, due to the weak interaction between boron powder and potassium nitrate, boron powder is easy to aggregate and distribute, and the surface of potassium nitrate crystal is partially exposed, resulting in a high dispersion of the combustion rate of the agent and a high deviation [8] .…”