A study on the decomposition pathways of HTPB and HTPE pyrolysis by mass spectrometric analysis

Qian, Yingying; Wang, Zhandong; Chen, Lin; Liu, Peiqi; Jia, Liangyuan; Dong, Biao; Li, Heng; Xu, Shidang

doi:10.1016/j.jaap.2023.105929

Cited by 13 publications

(1 citation statement)

References 42 publications

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“…According to the evolution of the TG-MS curve, the thermal decomposition process of the FPUs can be broadly categorized into three stages (as detailed in Table 3). The first stage is the urethane bond cleavage, exothermic cyclization, and cross-linking of the remaining HTPB, accompanied by partial decomposition of the cyclized products into low molecular weight species [24,28,29], and the decomposition of the DOA also begins. At this stage, the FPU5 polyurethane exhibited a weight loss percentage that was 6.8% higher than that of the FPU0, which could have been caused by the breakage of the -CF 2 bonds present in the OFHD chain extender.…”

Section: Thermal Decomposition Of Fpusmentioning

confidence: 99%

Effect of Fluoroalcohol Chain Extension Modified HTPB Binder on the Combustion Performance of Aluminized Propellants

Huang,

Chang,

Yao

et al. 2024

Crystals

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To enhance both the mechanical properties of hydroxyl-terminated polybutadiene (HTPB) binder and the combustion efficiency of aluminized propellants, 2,2,3,3,4,4,5,5-octafluoro-1,6-hexanediol (OFHD) was employed as a chain extender to impart mechanical regulation to the HTPB binder. Mechanical testing showed that the mechanical properties of fluoride-modified HTPB polyurethane (FPU) were significantly improved: the peak tensile strength of the optimized samples reached 1.99 MPa, and the elongation at break attained 486%. The structural characterization of the FPUs was conducted using Fourier transform infrared (FTIR) spectroscopy. Thermogravimetry-mass spectrometer (TG-MS) analysis revealed that the initial thermal decomposition temperature of the FPU shifted from 170 °C to 162 °C, accompanied by the release of fluorine-containing fragments during decomposition. Analysis of the combustion residue indicated that the addition of OFHD can reduce the agglomeration of aluminum (Al) powder in aluminized propellants. Dynamic pressure characteristics results showed an augmented pressurization rate under argon and oxygen atmospheres, increased by 18.67% and 37.29%, respectively. Heat release tests indicated that the aluminized propellants with the addition of OFHD had a higher combustion heat, being increased by 6.57%. The binder system is expected to be applied in aluminized propellants to improve the mechanical properties and combustion efficiency of Al powder.

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Section: Thermal Decomposition Of Fpusmentioning

confidence: 99%