Nanomaterials as modifier for composite solid propellants

Vara, Jalpa A.; Dave, Pragnesh N.; Ram, Vijay R.

doi:10.1016/j.nanoso.2019.100372

Cited by 17 publications

(5 citation statements)

References 111 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…No entanto, a adição de catalisadores metálicos tende a acelerar substancialmente o processo. 17 A quebra das moléculas de diamina é seguida pela formação de amônia e de metanoamina, conforme esperado e supracitado. Uma molécula que aparece diversas vezes no sistema é o CH 4 N 2 , resultado da abstração de dois hidrogênios ligados ao átomo de carbono da molécula, gerando NH 3 .…”

Section: Resultsunclassified

Dinâmica Molecular Reativa Da Abertura Do Anel Epóxi Em Reações Com Poliamina

et al. 2020

View full text Add to dashboard Cite

publicado na web em 06/04/2020 REACTIVE MOLECULAR DYNAMICS OF THE EPOXY RING-OPENING IN POLYAMINE REACTIONS. The molecular dynamics simulations were used to study the epoxy ring-opening in the determination of kinetic parameters, with a temperature range from 1500 to 2500 K in a 20 x 20 x 20 Å unit cell containing 15 molecules of C 2 H 4 O (ethylene oxide) and 35 molecules of CH 6 N 2 (methanediamine). The activation energy values for epoxy and diamine was 66 and 92 kJ mol -1 , respectively. The simulation showed epoxy ring breakage in some of the molecules, but mainly the release of ammonia by diamine. It was observed that the activation energy involved in diamine consumption for ammonia formation is higher than for the epoxy ring opening. The results of the epoxy ring-opening study show that the polymerization occurs slowly, which leads to high computational simulation values.

show abstract

Section: Resultsunclassified

Dinâmica Molecular Reativa Da Abertura Do Anel Epóxi Em Reações Com Poliamina

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Catalysts are known to affect the combustion of composite solid propellants (CSP) and its components-the oxidizer and the binder. Several reviews in this field have been published by various groups, including Hall & Pearson [8], Jacobs & Whitehead [6], Keenan [10], Kishore & Sunitha [5], Boldyrev [11], Shalini & Dave [12], Chen et al [13] and Vara et al [14]. Changes in the rate of combustion and breakdown of CSP and its components can be facilitated by catalysts known as transition metal oxides (TMO), such as Fe2O3, MnO2, Ni2O3, copper chromate, etc.…”

Section: Evolution Of Composite Solid Propellants (Csp)mentioning

confidence: 99%

Role of Oxides of Iron on the Combustion of Composite Solid Propellants: A Review

Olety,

Suggula,

Pattaswamy

2023

ajc

View full text Add to dashboard Cite

The effects of iron oxides (α-Fe2O3, γ-Fe2O3, Fe3O4 in the different size ranges from micron to nano) on the combustion of composite solid propellants, also known as hydroxyl terminated polybutadiene/aluminium/ammonium perchlorate (HTPB/Al/AP) systems, are thoroughly reviewed in this work. The effect of the oxides of iron in (i) condensed phase; (ii) sub-surface and surface; (iii) premix flame (gas phase); and (iv) final flame (gas phase) in deflagration zone are also critically reviewed. The effect of catalyst on the lower pressure limit (LPL), upper pressure limit (UPL) and ignition delay is also studied as a part of the combustion phases. It is understood that unlike during the combustion of pure ammonium perchlorate, the role of iron oxides starts its influence on binder system degradation, binder-ammonium perchlorate reactions at surface and HClO4 decomposition in gas phase. The role of aluminium is to contribute for larger energies in both primary and diffusion flame zone, the heat generated accelerates the surface reactions further. Another interesting topic is nano-oxides of iron, since nanosize contribute for definite increase in burn rate, but the disadvantage of agglomerations both at mixing level and combustion level needs to be addressed. Several strategies are suggested, with the most significant ones being co-precipitation with ammonium perchlorate and the utilization of dispersion agents.

show abstract

“…However, due to the potential adverse effects of energetic materials on the environment and health, thorough preparation has been necessary for their study. Moreover, the sensitive nature of these materials requires a meticulous research process [ 1 ]. Pouring is a crucial step in the production process of energetic materials [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the light of advancements in the production of propellant slurry component particles, there has been a reduction in their diameter to the nanometer scale. Consequently, Jalpa A et al conducted research on the rheology of propellant slurry-containing nanoparticles [ 1 ]. As rheometers continue to advance, dynamic rheological measurements have become increasingly accessible.…”

Section: Introductionmentioning

confidence: 99%

Study on Rheological Properties and Pouring Process of Hydroxyl-Terminated Polybutadiene (HTPB) Propellants

Wang,

Ji,

Jiang

et al. 2023

Polymers

View full text Add to dashboard Cite

The process of solid propellant production, which is the most widely used high-energy material, has garnered significant attention from researchers. However, there have been relatively few studies on its processing, due to the unique nature of the casting process. This paper aims to further analyze the pouring process of the propellant slurry. Initially, we obtained a sample of the propellant slurry and measured its rheological parameters using a rotary rheometer. From the analysis of the experimental results, we derived the viscosity parameters and the yield values of the propellant slurry. Subsequently, we simulated the pouring process, setting the slurry parameters based on the data obtained from the rheological measurement experiment. The simulation results demonstrated that the flower plate significantly impacts upon the cutting and separating effect on the slurry during pouring. Upon leaving the flower plate, the slurry descends onto the core mold platform under the influence of gravity, gradually flowing along the edge of the core mold. Although there may be some small voids in the pouring process, the voids will disappear completely at the end of pouring. A comparison with the actual pouring situation revealed a higher consistency between the simulation results and reality, thus establishing the reliability of the simulation method as a reference for analyzing the pouring process.

show abstract

Nanomaterials as modifier for composite solid propellants

Cited by 17 publications

References 111 publications

Dinâmica Molecular Reativa Da Abertura Do Anel Epóxi Em Reações Com Poliamina

Dinâmica Molecular Reativa Da Abertura Do Anel Epóxi Em Reações Com Poliamina

Role of Oxides of Iron on the Combustion of Composite Solid Propellants: A Review

Study on Rheological Properties and Pouring Process of Hydroxyl-Terminated Polybutadiene (HTPB) Propellants

Contact Info

Product

Resources

About