Study on Thermal Behaviour of AP/LiBH<sub>4</sub> Energetic System

Ding, Xiaoyong; Shu, Yuanjie; Xu, Hongtao; Chen, Zhiqun

doi:10.1002/prep.201700033

Cited by 12 publications

(4 citation statements)

References 29 publications

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“…The cook-off experiment was used to investigate the thermal performance of the PBFMO- b -GAP/Al complex, and the cook-off curves of PBFMO- b -GAP/Al composition are shown in Figure 11 . Generally, the thermal decomposition characteristics of the PBFMO- b -GAP/Al complex are close-linked with the response temperature peak of cook-off curves [ 50 , 51 , 52 ]. In this study, the response temperature peak of PBFMO- b -GAP/Al composition was up to 298 °C, which was significantly higher than that of the control group (269 °C).…”

Section: Resultsmentioning

confidence: 99%

Fluoropolymer/Glycidyl Azide Polymer (GAP) Block Copolyurethane as New Energetic Binders: Synthesis, Mechanical Properties, and Thermal Performance

Xu¹,

Lu²,

Liu³

et al. 2021

Polymers

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In order to enhance the application performance of glycidyl azide polymer (GAP) in solid propellant, an energetic copolyurethane binder, (poly[3,3-bis(2,2,2-trifluoro-ethoxymethyl)oxetane] glycol-block-glycidylazide polymer (PBFMO-b-GAP) was synthesized using poly[3,3-bis(2,2,2-trifluoro-ethoxymethyl)oxetane] glycol (PBFMO), which was prepared from cationic polymerization with GAP as the raw material and toluene diisocyanate (TDI) as the coupling agent via a prepolymer process. The molecular structure of copolyurethanes was confirmed by attenuated total reflectance-Fourier transform-infrared spectroscopy (ATR–FTIR), nuclear magnetic resonance spectrometry (NMR), and gel permeation chromatography (GPC). The impact sensitivity, mechanical performance, and thermal behavior of PBFMO-b-GAP were studied by drop weight test, X-ray photoelectron spectroscopic (XPS), tensile test, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA), respectively. The results demonstrated that the introduction of fluoropolymers could evidently reduce the sensitivity of GAP-based polyurethane and enhance its mechanical behavior (the tensile strength up to 5.75 MPa with a breaking elongation of 1660%). Besides, PBFMO-b-GAP exhibited excellent resistance to thermal decomposition up to 200 °C and good compatibility with Al and cyclotetramethylene tetranitramine (HMX). The thermal performance of the PBFMO-b-GAP/Al complex was investigated by a cook-off test, and the results indicated that the complex has specific reaction energy. Therefore, PBFMO-b-GAP may serve as a promising energetic binder for future propellant formulations.

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Section: Resultsmentioning

confidence: 99%

Fluoropolymer/Glycidyl Azide Polymer (GAP) Block Copolyurethane as New Energetic Binders: Synthesis, Mechanical Properties, and Thermal Performance

Xu¹,

Lu²,

Liu³

et al. 2021

Polymers

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“…However, the mass loss of AP heating in a closed system was only 2.20 %. This is because in an open system AP decomposes into absorbed HClO 4 and NH 3 on the surface of the crystal, then adsorbed HClO 4 and NH 3 diffuse into the surrounding atmosphere [32]. But in a closed system, the pressure rises rapidly due to the AP decomposition, and the increase in system pressure is bad for the desorption of HClO 4 and NH 3 , which inhibited the further decomposition of AP.…”

Section: Slow Cook-off Behavior Of Apmentioning

confidence: 99%

Effect of Block Structure of Copolyether Binder on Slow Cook‐Off Response of Composite Propellant

Zhang

Ding

et al. 2022

Propellants Explo Pyrotec

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As the typical insensitive propellants, hydroxyl‐terminal block copolyether (HTPE) and hydroxyl‐terminal block copolyether (PET) propellant all belong to copolyether propellants. The two binders of propellants have different arrangements of copolyether structure. But, the effect of copolyether structure arrangement on the slow cook‐off behavior of propellants and its possible mechanism has been unknown. So, in this paper, the slow cook‐off behaviors of HTPE and PET propellants were tested. The result showed PET propellant responded more violently than HTPE propellant. Then, the changes of mass loss, explosion heat, and combustion performance of propellants during the cook‐off test were studied. Combined with the slow cook‐off behavior of AP and binders, the mechanism of block structure effect on slow cook‐off response of propellant was proposed. It expressed that, the binders of HTPE and PET propellant all degraded into liquid products due to the copolyether structure; but the block structure has a significant effect on the chain scission process of copolyether binder, which makes slight degradation and the mild response to slow cook‐off for HTPE propellant. While the binder of PET propellant with the random structure degraded seriously, making more mass loss, bigger explosion heat, and worse combustion performance, the PET propellant responds violently to slow cook‐off.

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“…The cook-off experiments were used to study the thermal performance of PBFMO-b-GAP and Al [36][37][38] .…”

Section: Cook-off Testmentioning

confidence: 99%

Fluoropolymer/GAP Block Copolyurethane Binders: Sensitivity, Mechanical Properties and Reactive Properties with Aluminum

Xu¹,

Lu²,

Liu³

et al. 2021

Preprint

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In order to enhance the application properties of GAP in solid propellant, an energetic copolyurethane binder, (poly[3,3-bis(2,2,2-trifluoro-ethoxymethyl)oxetane] glycol-block-glycidylazide polymer (PBFMO-b-GAP) was developed. The PBFMO-b-GAP was prepared using poly[3,3-bis(2,2,2-trifluoro-ethoxymethyl)oxetane] glycol (PBFMO) which preparing from cationic polymerization and GAP as the raw materials, TDI as the coupling agent via a prepolymer process. The molecular structure of copolyurethane was confirmed by FT-IR, NMR, GPC. The impact sensitivity, mechanical properties and thermal behavior of PBFMO-b-GAP were studied by drop weight test, XPS, tensile test, SEM, DSC and TG/DTG respectively. The results proved that the introduction of fluoropolymer can evidently reduce the sensitivity of GAP based polyurethanes and enhance their mechanical behavior (the tensile strength up to 5.75MPa with a breaking elongation of 1660 %). Also, PBFMO-b-GAP exhibited an excellent resistance to thermal decomposition up to 200°C and good compatibility with Al and HMX. Cook-off test was used to investigate the reactive of copolyurethanes and Al, the results indicated that the copolyurethanes could react with Al efficiently and release significantly more heat. Therefore, the energetic copolyurethanes may serve as promising energetic binders for future propellant formulations.

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Study on Thermal Behaviour of AP/LiBH₄ Energetic System

Cited by 12 publications

References 29 publications

Fluoropolymer/Glycidyl Azide Polymer (GAP) Block Copolyurethane as New Energetic Binders: Synthesis, Mechanical Properties, and Thermal Performance

Fluoropolymer/Glycidyl Azide Polymer (GAP) Block Copolyurethane as New Energetic Binders: Synthesis, Mechanical Properties, and Thermal Performance

Effect of Block Structure of Copolyether Binder on Slow Cook‐Off Response of Composite Propellant

Fluoropolymer/GAP Block Copolyurethane Binders: Sensitivity, Mechanical Properties and Reactive Properties with Aluminum

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Study on Thermal Behaviour of AP/LiBH4 Energetic System

Cited by 12 publications

References 29 publications

Fluoropolymer/Glycidyl Azide Polymer (GAP) Block Copolyurethane as New Energetic Binders: Synthesis, Mechanical Properties, and Thermal Performance

Fluoropolymer/Glycidyl Azide Polymer (GAP) Block Copolyurethane as New Energetic Binders: Synthesis, Mechanical Properties, and Thermal Performance

Effect of Block Structure of Copolyether Binder on Slow Cook‐Off Response of Composite Propellant

Fluoropolymer/GAP Block Copolyurethane Binders: Sensitivity, Mechanical Properties and Reactive Properties with Aluminum

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Study on Thermal Behaviour of AP/LiBH₄ Energetic System