Effect of NQ content on the thermal decomposition of nitroguanidine propellant using isoconversional methods

Liu, Zhi-tao; Zhang, Fen; Du, Ping; Xu, Bin

doi:10.1007/s10973-018-7951-y

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…Based on the DSC test data, the apparent activation energy of the samples was calculated to assess the decomposition kinetics. − The apparent activation energy of NQ decomposition was calculated using the Kissinger method and the Starink method. , …”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Ultrafine Nitroguanidine with Different Aspect Ratios

Liang,

Zhang,

Wei

et al. 2023

ACS Omega

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In order to improve the mechanical properties and thermodynamic stability of the long needle-like raw material Nitroguanidine (NQ), it was pulverized by a mechanical pulverization method and dried by a spray drying method, and three ultrafine NQ samples with different aspect ratios (2.26, 1.87, and 1.25) were prepared. The samples were tested and characterized by scanning electron microscopy, digital imaging particle size analysis, X-ray diffraction, and differential scanning calorimetry (DSC), and the impact sensitivity and bulk density of the raw NQ and ultrafine NQ samples were also tested. The results show that ultrafine NQ has the smallest particle size D50 of 9.18 μm, with uniform particle size distribution, unchanged crystal structure, and no introduction of impurities, and the impact sensitivity was the same as that of the feedstock NQ, which was 0. In addition, with the decreasing aspect ratio of the NQ particles, their apparent activation energy increased, and the energy required to be absorbed in the thermal decomposition increased; their thermal stability was also better.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Ultrafine Nitroguanidine with Different Aspect Ratios

Liang,

Zhang,

Wei

et al. 2023

ACS Omega

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“…25 Therefore, the key issue lies in how to improve the mechanical behavior of NQ in propellants without compromising its combustion performance. [27][28][29] Recent years have witnessed the rapid emergence of nanotechnology, with various nanoscale high-energy explosives being developed and incorporated into propellant formulations. [30][31][32][33][34] Nanosizing methods for highenergy explosives encompass a wide range of techniques, including ball milling, 35 electrostatic spraying, 36 etc.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive research has been conducted on the thermal properties of NQ with different particle sizes, as well as the combustion performance of triple-based propellants. 27,28,33 However, there remains a scarcity of studies investigating the mechanical performance differences in triple-base propellants caused by NQ with different particle sizes. Understanding the influence of NQ with different particle sizes on the mechanical properties of triple-base propellants is crucial for optimizing their performance and ensuring their reliability and safety.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, from a theoretical standpoint, reducing the particle size and achieving a spherical morphology can potentially mitigate internal defects within NQ crystals, as well as minimize the formation of stress concentrations and voids at the interfaces when combined with the matrix. Extensive research has been conducted on the thermal properties of NQ with different particle sizes, as well as the combustion performance of triple‐based propellants 27,28,33 . However, there remains a scarcity of studies investigating the mechanical performance differences in triple‐base propellants caused by NQ with different particle sizes.…”

Section: Introductionmentioning

confidence: 99%

“…Luo et al controlled crystal morphologies in the crystallization process and contributed to the improvement of density and flowability 25 . Therefore, the key issue lies in how to improve the mechanical behavior of NQ in propellants without compromising its combustion performance 27–29 …”

Section: Introductionmentioning

confidence: 99%

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Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Li,

Huang,

Wang

et al. 2024

Polymer Composites

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Fillers play a decisive role in the mechanical properties of polymer composites. In this paper, different particle sizes of nitroguanidine were obtained to regulate the internal filler structure of triple‐base propellants (TBP) to improve their mechanical response in different environments. A series of morphological and structural characterizations on nitroguanidine (NQ) particles were conducted using techniques. The results indicated that the obtained NQ particles maintained a high level of crystalline quality while preserving their molecular integrity. The mechanical properties of TBP were systematically evaluated under various loading conditions, including cryogenic tensile, compressive, and impact loads, as well as dynamic thermomechanical effects. Additionally, three‐point bending simulations were employed to elucidate the mechanical responses and damage mechanisms. Under axial tensile and compressive loads, reducing the particle size of NQ significantly enhanced the tensile and compressive strength. The maximum tensile strength and compressive strength can reach 344.62 MPa and 104.79 MPa. Moreover, the compressive failure mode transitioned from cracking to axial shrinkage. Conversely, when subjected to radial bending loads, TBP exhibited contrasting behavior, including a decrease in the glass transition temperature from 84.73°C to 76.93°C and a non‐monotonic trend in impact strength (initially increasing from 4.96 to 8.85 kJ/m2 and then decreasing to 2.27 kJ/m2). This study provides valuable insights into the mechanical performance of TBP, supporting the development of high‐energy, high‐strength TBP formulations.Highlights SEM analysis confirms the pronounced orientation effect of rod‐like NQ. The orientation and particle size of NQ decide TBP's radial impact resistance. Submicron NQ enhances the compression resistance property of TBP. Submicron NQ brings about a shift in the microscopic damage morphology of TBP.

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Chaetomium elatum treatment of nitrocellulose: investigation on structural and thermal properties

Huang,

Zhang,

Xue

et al. 2023

Cellulose

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Biological method is a sustainable method for various waste polymers treatment due to green, low-cost, mild condition and simple operation. In this study, a novel biological method to process nitrocellulose (NC) to obtain NC with low nitrogen via nitrate ester removal using fungal Chaetomium elatum was proposed. With the extension of time (6 d), the N% of NC declined continuously from 13.06% to 11.71%.Structure properties were investigated by Fourier-transform infrared spectroscopy (FTIR), and Laser Raman co-focal microspectrometry (Raman), which showed the intensity of energetical groups (O-NO 2 , -NO 2 ) decreased. Most importantly, the thermal decomposition properties were performed using Thermogravimetric analysis (TG) and Differential scanning calorimetry (DSC) analysis, where the kinetic parameters of thermal decomposition reaction with DSC were calculated by three traditional methods: Friedman-Reich-Levi, Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose. It indicated that the weight-loss ratio of bio-treated NC decreased from 86.33% to 66.20% and the activation energy (E a ) increased rst and then reduced as the increase of denitri cation time, which demonstrating thermostability of biotreated NC was enhanced. Hence, this structure exploration and thermodynamic analysis provide new method for further investigation of the mechanism of the biological denitri cation process and the assessment safety of bio-treated NC.

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Effect of NQ content on the thermal decomposition of nitroguanidine propellant using isoconversional methods

Cited by 12 publications

References 19 publications

Preparation and Characterization of Ultrafine Nitroguanidine with Different Aspect Ratios

Preparation and Characterization of Ultrafine Nitroguanidine with Different Aspect Ratios

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Chaetomium elatum treatment of nitrocellulose: investigation on structural and thermal properties

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