Chemical Bond Between Stabilizers and HTPB Binders in Propellants

Désilets, S.; Côté, Sébastien

doi:10.1002/1521-4087(200009)25:4<186::aid-prep186>3.0.co;2-b

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The specifics of each test are detailed below. While it would have been beneficial to also determine the extent of anti-oxidant depletion on ageing, it has been demonstrated in the past that the two anti-oxidants employed in this propellant formulation are chemically bound into the cross-linked polybutadiene binder matrix and cannot be extracted for meaningful quantitative analysis [4].…”

Section: Methodsmentioning

confidence: 99%

An Investigation of Composite Propellant Accelerated Ageing Mechanisms and Kinetics

Judge¹

2003

Propellants Explo Pyrotec

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The ageing kinetics and mechanisms of a composite solid rocket propellant were investigated by monitoring unstressed propellant samples during prolonged storage at elevated temperatures. For samples confined under air during ageing, it was determined that oxidative cross-linking of the propellant binder was the main degradation mechanism over time. Plasticizer loss was a significant ageing mechanism only for those samples aged unconfined. In addition, there was an indication that ambient humidity had a significant but reversible effect on propellant mechanical properties. Arrhenius mathematical relationships were derived in order to ascertain the extent to which ageing was accelerated by increased propellant temperature. An activation energy for binder oxidation of between 71 and 74 kJ/mol was determined.

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Section: Methodsmentioning

confidence: 99%

An Investigation of Composite Propellant Accelerated Ageing Mechanisms and Kinetics

Judge¹

2003

Propellants Explo Pyrotec

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“…2) indicated that the well-known yellowing of hindered phenol antioxidants (Vulic et al, 2002), even in the absence of oxygen (Bangee et al, 1995), may be related to the apparent change in HTPB reactivity, which was observed independently of the oxygen partial pressure. In fact, some studies (Celina et al, 2006;Désilets and Côté, 2006;Shanina, Zaikov and Mukmeneva, 1996) have demonstrated that quinone derivatives from hindered phenol antioxidants react quite readily with isocyanates and graphitize into HTPB backbone. Based on this literature evidence, our results indicate that the apparent increase of the HTPB/IPDI binder reactivity is due to a side-reaction between BHT quinone derivatives and IPDI.…”

Section: Resultsmentioning

confidence: 99%

The role of antioxidant on propellant binder reactivity during thermal aging

Villar¹,

Silva²,

Diniz³

et al. 2010

JATM

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Thermal aging of hydroxy-terminated polybutadiene (HTPB) stabilized with 2,6-di(tert-butyl)hydroxytoluene (BHT) was carried out at 60 o C from 1 to 11 weeks. Samples of 200 mL were stored in sealed 500-mL Erlenmeyer flasks under atmospheric pressure or vacuum and periodically withdrawn for physical and chemical analysis, infrared spectroscopy characterization and measurement of HTPB/IPDI (isophorone diisocyanate) reactivity, expressed as pot life. Mechanical properties of the cured polyurethane, prepared from aged HTPB, were assayed by uniaxial tension tests. Despite the unchanged chemical structure, an increase in HTPB/IPDI binder reactivity was observed, being correlated with BHT depletion measured as color change (yellowing). Aging of HTPB showed no interference on mechanical properties of the cured polyurethane.

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“…Curing Agents or Crosslinkers: TDI is selected as crosslinking agent. Its purity is greater than 98% and the isomer ratio is 35/65 [4].…”

Section: B Solid Propellant Ingredients Bindersmentioning

confidence: 99%

Improvement of Composite Propellants Energy Using Explosive Materials

Saeed¹,

Elamin²

2021

JKUES

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Composite propellants are energetic materials have ability to ignite, burn fast and cause several simultaneous exothermic chemical reactions which produce huge amounts of gases under high pressures and temperatures which can spread spontaneously. 1n the present study, the explosive material hexogen (Cyclo tri-methylene tri-nitramine) was used to improve the performance properties of composite propellants, especially the specific impulse. For several formulations of hexogen at different added percentages, the specific impulse was calculated using thermodynamic calculations program of composite propellants. The results given were compared with those formulations not including hexogen. It was seen that; hexogen caused a significant positive effect in the specific impulse. Accordingly, the energy of composite propellant was improved positively in the samples containing hexogen till 40% of the oxidizer ratio. Also, it was noticed that the specific impulse began to decrease gradually for the oxidizers containing more than 40% of hexogen which caused in a decreasing of composite propellant energy. Finally, it was concluded that, the use of some amount of explosive materials like hexogen can improve composite propellants energy successfully.

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Chemical Bond Between Stabilizers and HTPB Binders in Propellants

Cited by 10 publications

References 6 publications

An Investigation of Composite Propellant Accelerated Ageing Mechanisms and Kinetics

An Investigation of Composite Propellant Accelerated Ageing Mechanisms and Kinetics

The role of antioxidant on propellant binder reactivity during thermal aging

Improvement of Composite Propellants Energy Using Explosive Materials

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