Combustion Properties of Composite Propellants Based on Two Kinds of Polyether Binders and Different Oxidizers

Gong, Li; Li, Jianmin; Li, Yuping; Yang, Rongjie

doi:10.1002/prep.202000041

Cited by 13 publications

(7 citation statements)

References 37 publications

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“…9,10 In addition, isocyanates with high reactivity can react with other energetic components, causing a reduction in energy density. [11][12][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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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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“…Solid composite propellants and polymer bonded explosives (PBX) are mainly composed of oxidizer, Al powder, and binder [1,2]. Generally, PU is employed as a binder to provide dimensional stability for filler particles and ideally to enhance the combustion properties of the system [3].…”

Section: Introductionmentioning

confidence: 99%

Oxidizability Enhancement of Hydroxyl Terminated Polyether Polyurethane Elastomers via Fluoroalcohols Grafting

Shen

Yan

Sun³

et al. 2022

Propellants Explo Pyrotec

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A series of fluoroalcohol grafted hydroxyl-terminated polyether (HTPE) polyurethanes (PU) elastomers were synthesized by a two-step method. The reaction progress was investigated by chemical titration and Fourier transform infrared spectroscopy (FTIR). The glass transition temperature (Tg), mechanical properties, morphology, and thermal decomposition behavior were determined for the preliminary analysis of PUs; the oxidizability property was tested by the decomposition of PU/Al composites. The results of mechanical and morphology properties demonstrated that the mechanical strength of modified PU elastomers was effectively improved for microphase separation of the hard segment. The PU film with the optimized fluoroalcohol content shows excellent performance of 17.7 MPa (tensile strength) and 547 % (elongation at break) at room temperature. Analysis of the thermal behaviors suggests that the oxidation ability of the modified PU is enhanced by the strong electronegativity of fluorine. The oxidizing gas HF, CF x , released during fluoroalcohol decomposition reacts with the alumina shell, releasing internal reactive Al, which improves the activity of the aluminum. This study might provide a new idea for utilizing high-performance polymer binders in composite solid propellants and casting explosives.

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“…So, the type of binder has a great influence on the slow cook-off behavior of propellant when the solid content and the kind of filler are constant [8][9][10][11]. The degradation of binder under cook-off conditions has an important influence on the combustion performance [12][13][14], the degree of thermal damage and other performance of propellants [15,16].…”

Section: Introductionmentioning

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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Combustion Properties of Composite Propellants Based on Two Kinds of Polyether Binders and Different Oxidizers

Cited by 13 publications

References 37 publications

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

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

Oxidizability Enhancement of Hydroxyl Terminated Polyether Polyurethane Elastomers via Fluoroalcohols Grafting

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

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