scholarly journals Noncrystalline Binder Based Composite Propellant

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Mohamed Abdullah ◽  
F. Gholamian ◽  
A. R. Zarei
Keyword(s):  
Mechanical Properties ◽  
Specific Impulse ◽  
Thermal Analyses ◽  
Energetic Material ◽  
Solid Loading ◽  
Attractive Alternative ◽  
Composite Propellant ◽  
Composite Solid Propellants ◽  
Solid Rocket ◽  
Composite Solid

This study reports on propellants based on cross-linked HTPE binder plasticized with butyl nitroxyethylnitramine (BuNENA) as energetic material and HP 4000D as noncrystalline prepolymer. This binder was conducted with solid loading in the 85%. The results showed an improvement in processability, mechanical properties and burning rate. In addition, its propellant delivers (about 6 seconds) higher performance (specific impulse) than the best existing composite solid rocket propellant. Thermal analyses have performed by (DSC, TGA). The thermal curves have showed a low glass transition temperature () of propellant samples, and there was no sign of binder polymer crystallization at low temperatures (−50°C). Due to its high molecular weight and unsymmetrical or random molecule distributions, the polyether (HP 4000D) has been enhanced the mechanical properties of propellants binder polymer over a large range of temperatures [−50, 50°C]. The propellants described in this paper have presented high volumetric specific impulse (>500 s·gr·cc−1). These factors combined make BuNENA based composite propellant a potentially attractive alternative for a number of missions demanding composite solid propellants.

scholarly journals Effect of bonding agent production materials on the mechanical properties of composite solid rocket propellant

2018 ◽  
Vol 189 ◽  
pp. 08001 ◽  
Author(s):  
Ali.M.Abd elall ◽  
Guo Lin
Keyword(s):  
Mechanical Properties ◽  
Solid Particles ◽  
Bonding Agent ◽  
Solid Propellants ◽  
Solid Rocket Propellant ◽  
Bonding Agents ◽  
Composite Solid Propellants ◽  
Good Strain ◽  
Solid Rocket ◽  
Composite Solid

An effective pathway was explored to design and select proper bonding agents that could effectively improve the interfacial interactions between bonding agents and solid particles, modern types of composite solid propellants focused on increasing the mechanical properties in order to withstand stresses produced due to various loading conditions, changes in environmental condition, transportation and handling. In this work, the study show that the effect of solvent in production of bonding agent has a different impact on the mechanical properties as the polar solvent in formulation S3 has a good strain values corresponding to the stress. Also the changing of the percentage of CuCl2 has a significant effect on mechanical properties as giving high value of strain with the percentage of 4.5 % and returns back the value of strain decrease with increase the percentage of CuCl2 to give the lowest values of the strain corresponding to the stress value with percentage 7.5 %.

Correlation between Alternating Temperature Accelerated Aging and Real World Storage of Composite Propellant

2012 ◽  
Vol 525-526 ◽  
pp. 421-424
Author(s):  
Biao Ding ◽  
Pei Shi ◽  
Xin Qiu
Keyword(s):  
Mechanical Properties ◽  
Real World ◽  
Accelerated Aging ◽  
Solid Rocket Motor ◽  
Composite Propellant ◽  
Accelerated Aging Test ◽  
Aging Test ◽  
Htpb Propellant ◽  
Alternating Temperature ◽  
Solid Rocket

Alternating temperature accelerated aging test was designed to ensure that accelerated aging could preferably simulate real world storage of HTPB composite propellant. Mechanical properties of HTPB propellant aged for three different periods were measured and analyzed. The results indicate that, the tensile strength increased and the elongation decreased after accelerated aging, showing the same trend of real world storage; the mechanical properties of HTPB propellant is strongly influenced by the rate of temperature change; alternating temperature accelerated aging test is consistent well with real world storage. The results can be very helpful for solid rocket motor life prediction.

Influence of different crosslinking mixtures on the mechanical properties of composite solid rocket propellants based on HTPB

2020 ◽  
pp. 095400832094035
Author(s):  
Islam K Boshra ◽  
Guo Lin ◽  
Ahmed Elbeih
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Crosslinking Agent ◽  
Weight Ratio ◽  
High Strength ◽  
Rocket Propellants ◽  
Wide Range ◽  
Solid Rocket ◽  
Solid Rocket Propellants ◽  
Composite Solid

The crosslinking agent is a vital key which affects the mechanical properties of composite solid rocket propellants (CSRPs). Under this scheme, the effect of crosslinking mixtures (CMs) based on trimethylolpropane (TMP) as a triol crosslinker and butanediol (BD) as a chain extender on CSRPs based on hydroxyl-terminated polybutadiene was investigated. A series of 27 propellant compositions was formulated to study the mechanical properties of the prepared CSRPs. The effect of changing the weight ratio of TMP to BD in the CM was studied. In addition, the influence of increasing the percentage of CM (from 0% to 0.5%) in the prepared samples was investigated. Also, the effect of the CM on CSRPs containing different curing ratio of NCO/OH = 0.7, 0.75, and 0.8 was studied to generate the largest possible strain-ability with high strength over different levels of curing conditions. The mechanical characteristics (tensile strength and strain) of the prepared CSRPs have been measured and plotted versus CM content, NCO/OH and TMP:BD ratio. Generally, the addition of CM leads to a remarkable enhancement in the propellant mechanical properties. Samples containing TMP:BD (2:1) provide the highest strength while samples containing TMP:BD (1:2) show the highest strain over all the NCO/OH ratios. Formulations with TMP:BD (1:1) give high strength with moderate strain. Variation in CM content has a remarkable influence on the mechanical properties of CSRPs. A wide range of tensile strength and strain were obtained from this study to offer variety of results suitable for different applications in the CSRPs technology.

scholarly journals Catalytic Effects of Ruthenocene Bimetallic Compounds Derived from Fused Aromatic Ring Ligands on the Main Oxidizing Agent for Solid Rocket Motor

2022 ◽  
Author(s):  
Yuvaraja Dibdalli ◽  
José Gaete ◽  
Claudio Osorio-Gutierrez ◽  
Juan Luis Arroyo ◽  
Angel Norambuena ◽  
...  
Keyword(s):  
Decomposition Temperature ◽  
Solid Propellants ◽  
Solid Rocket Motor ◽  
Aromatic Rings ◽  
Scanning Calorimetry ◽  
Composite Solid Propellants ◽  
Solid Rocket ◽  
Bimetallic Compounds ◽  
Catalytic Effects ◽  
Composite Solid

We report the catalytic effect of three ruthenocene bimetallic compounds derived from fused aromatic rings of general formula [{Cp*Ru}2L], with Cp*: pentamethylcyclopentadiene and L = pentalene (1), 2,6-diethyl-4,8-dimethyl-s-indacene (2), and 2,7-diethyl-as-indacene (3), on the thermal decomposition of ammonium perchlorate (AP). The new compound 3 was characterized by a combination of multinuclear magnetic resonance (NMR) spectroscopy and elemental analysis. The differential scanning calorimetry (DSC) analysis of compound 3 shows a decrease in the decomposition temperature of AP to 347 ºC, increases the energy release to 2048 J g-1 and, consequently, leads to the lowest activation energy (42.9 kJ mol−1). These results are comparable to the typically used metallocene (catocene: 347 ºC and 2472 J g-1), suggesting a suitable and competitive alternative to be used as a modifier for composite solid propellants.

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