Effect of Morphology for Ammonium Dinitramide on the Mechanical and Combustion Properties of Composite Propargyl‐terminated Copolyether Propellant

Gong, Li; Li, Yonghui; Guo, Yuzhu; Li, Jianmin; Yang, Rongjie

doi:10.1002/prep.201900348

Cited by 12 publications

(7 citation statements)

References 31 publications

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“…One explanation may be that the activity of hydroxyl with benzaldehyde in TBA‐403 decreases because of the already formed Schiff base, owing to the big space steric hindrance caused by benzene rings. On the other hand, the G′ can also increase with the interfacial actions between fillers and binder, which limits the movement of molecular chains [27–28].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Polyetheramine Based Bonding Agents and Their Effect on Mechanical Properties of an AP/CL‐20/GAP Formulation

Pang²,

Wu³

et al. 2021

Propellants Explo Pyrotec

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Two types of bonding agents were synthesized based on polyetheramines (PEAs), which aim to increase the strain of AP/CL‐20/GAP formulation. The PEAs, terminated with cyano (CTPEA) and Schiff base (SBPEA) groups, were applied in the AP/CL‐20/GAP formulation, respectively. The results showed that the bonding agents TCN‐403 (CTPEA) and TBA‐403 (SBPEA), which were prepared from trifunctional PEA named as T‐403, could significantly increase the maximum elongation ratio of the formulation. The differences between the TCN‐403 and TBA‐403 were analyzed by DMA of the formulations, SEM of the coated fillers, and in‐situ tensile test, indicating that the Schiff base bonding agents can effectively inhibit the dewetting of the binder from the solid particles in the formulations.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Polyetheramine Based Bonding Agents and Their Effect on Mechanical Properties of an AP/CL‐20/GAP Formulation

Pang²,

Wu³

et al. 2021

Propellants Explo Pyrotec

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“…Unfortunately, this reaction is highly humidity‐sensitive, resulting in network defects and deterioration in the mechanical properties 9,10 . In addition, isocyanates with high reactivity can react with other energetic components, causing a reduction in energy density 11–13 . Thus, developing an isocyanate‐free curing system to fabricate the binder with good mechanical properties is necessary.…”

Section: Introductionmentioning

confidence: 99%

Inserting urethane into 1,2,3‐triazole click‐cured solid propellant binder to form microphase separation and enhance mechanical and combustible performances

Zhang

Gan

et al. 2023

J of Applied Polymer Sci

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Huisgen‐click curing systems are widely used in solid propellant binders due to their low humidity sensitivity and mild reaction conditions. However, the rigid triazole rings from the Huisgen‐click reaction decrease the molecular moving ability and increase decomposition temperature, lowering the mechanical and combustion performance. Thus, we bonded the Huisgen‐click system and polyester binders with urethane, forming microphase separation and improving chemical stability. The results show that the elongation at break, tensile strength, and Young's modulus of the binders increase by 533.3%, 201.2%, and 1263.9%, respectively. Furthermore, the urethane reduces the thermal resistance index of the binders from 191.2 to 179.2°C, which means better combustion performance. Further mechanism study reveals that the urethane leads to microphase separation, which aggregates the hard segments and weakens their restriction effect on the molecular motion of polyether. Such a microphase separation brings comprehensive improvement in the mechanical properties of the solid propellants and probably can be used in other multi‐component systems of energetic materials.

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“…The structural integrity study of grain is based on research on the mechanical characteristics and constitutive model of solid propellant [8][9][10][11]. External temperature, loading strain rate, and loading mode all had a clear impact on the mechanical characteristics of solid propellants [12][13][14]. To inform the structural design of grain and guarantee the appropriate operation of SRM, research on the mechanical characteristics and constitutive model of solid propellants under various loading circumstances was of major value [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement and simulation of the biaxial mechanical properties of solid propellant HTPB

Jin,

Yan,

Fang

et al. 2023

Propellants Explo Pyrotec

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Hydroxyl‐terminated polybutadiene (HTPB) solid propellant was widely used in carrier rocket and guided missiles, owing to its excellent mechanical properties. The material of HTPB subjected to complex load such as in the process of manufacturing, storage and transportation. Therefore, the mechanical properties of HTPB had important implications for the safety of structure and service life. The purpose of this work is to study the effects of different loading ratios and loading speeds on the biaxial tension of hydroxyl‐terminated polybutadiene (HTPB) solid propellant with a proper kind of biaxial tensile specimen and a high volume fraction three dimensional particle filling model of the material. The proper kind of biaxial tensile specimen with which the stresses in its central part could be obtained with the loads acted on each loading direction was designed and used in the study, and the strains in its central parts were obtained with digital image correlation (DIC) method. The stress‐strain relationship at each direction could be obtained by experiments. Experimental results indicated that the loading speed remarkably influenced the biaxial tensile behaviors of HTPB propellant at room temperature and at different loading ratios. The finite element simulation results demonstrated the accuracy of the biaxial experiment. Based on the experimental results, the particle debonding in biaxial experiments were analyzed and an equivalent Poisson's ratio parameter was proposed to evaluate the degree of debonding. The highly volume fraction three dimensional particle filling model provides a good simulation with experimental results and the equivalent Poisson's ratio parameter can conveniently and accurately determine the debonding of particles which is meaningful to the structure integrity assessment of HTPB solid propellant.

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Effect of Morphology for Ammonium Dinitramide on the Mechanical and Combustion Properties of Composite Propargyl‐terminated Copolyether Propellant

Cited by 12 publications

References 31 publications

Synthesis of Polyetheramine Based Bonding Agents and Their Effect on Mechanical Properties of an AP/CL‐20/GAP Formulation

Synthesis of Polyetheramine Based Bonding Agents and Their Effect on Mechanical Properties of an AP/CL‐20/GAP Formulation

Inserting urethane into 1,2,3‐triazole click‐cured solid propellant binder to form microphase separation and enhance mechanical and combustible performances

Experimental measurement and simulation of the biaxial mechanical properties of solid propellant HTPB

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