Diffusion of plasticizer in a solid propellant based on hydroxyl-terminated polybutadiene

Libardi, Juliano; Ravagnani, Sergio Persio; Morais, Ana Marlene F.; Cardoso, Antonio R.

doi:10.1590/s0104-14282010005000048

Cited by 12 publications

(8 citation statements)

References 16 publications

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“…It suggested that the less the Ea, the faster and easier the migration, which was correspond to the migration rate constants. Diffusion coefficients of the migration components in propellant, liner and insulation may give important information for their migration [16][17][18]. The diffusion of a single substance from the interface into the isolation may be considered as ordinary diffusion into a semiinfinite slab and is described by Fick's second law of diffusion.…”

Section: Methodsmentioning

confidence: 99%

“…Gottlieb and Bar studied plasticizer migration across bonded HTPB/AP propellant interfaces during cure and evaluated the diffusion coefficient to show that the curing period is significant to the migration phenomenon and direct influence on tensile strength for short aging periods [16]. Libardi et al determined the dioctyl azelate (DOZ) plasticizer diffusion coefficient (D) for samples containing the interfaces of rubber, liner and solid composite propellant based on HTPB to be 0.70, 2.29, 6.27 × 10 −11 m 2 s −1 in liner and propellant at different layer resulted from Fick's second law [17]. Grythe and Hansen determined diffusion coefficients for isocyanates and plasticizers in ethylene propylene terpolymer (EPDM), HTPB, hydroxyl-terminated polyethylene glycol (HTPE) or glycidyl azide polymer (GAP) to be vary between 10 −11 and 10 −17 m 2 s −1 by the weight of uptake method in polymer materials [18].…”

Section: Introductionmentioning

confidence: 99%

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Migration kinetics and mechanisms of plasticizers, stabilizers at interfaces of NEPE propellant/HTPB liner/EDPM insulation

Huang

Nie

Zhang

et al. 2012

Journal of Hazardous Materials

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Migration kinetics and mechanisms of plasticizers, stabilizers at interfaces of NEPE propellant/HTPB liner/EDPM insulation

Huang

Nie

Zhang

et al. 2012

Journal of Hazardous Materials

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“…Libardi et al assumed the initial and boundary conditions for equation . By applying these conditions and using the method of separation of variables, the following equation was obtained:

\frac{M_{t}}{M_{eq}} = 1 - true {true\sum}_{n = 0}^{\infty} \frac{8}{(2 n + 1) π^{2}} exp [\frac{- D {(2 n + 1)}^{2} π^{2} t}{4 l^{2}}]

…”

Section: Mechanisms Of Br Enhancement and Migration Of Ferrocene‐basementioning

confidence: 99%

Progress on the synthesis and catalytic and anti‐migration properties of ferrocene‐based burning rate catalysts

Zhou

Wang

et al. 2016

Applied Organom Chemis

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Burning rate catalysts are of great importance in solid composite propellants for their unique property of accelerating combustion speed. Among various kinds of burning rate catalysts, ferrocene and its derivatives exhibit excellent catalytic effects and have become the most widely used burning rate catalysts. However, these simple ferrocenyl compounds trend to migrate in solid composite propellants during storage, which causes great damage to the propellants, equipment and environment and can even affect personal safety. The exploration of novel anti‐migratory ferrocene‐based compounds has become an advanced research hotspot in the field of burning rate catalysis. This review focuses on recent progress on the synthesis and catalytic properties of ferrocene‐based polymers and ferrocene derivatives as burning rate catalysts. Two main aspects of anti‐migratory exploration, i.e. synthesis of ferrocene‐based polymers and modification of the side groups of ferrocene, are summarized. Ferrocene‐based polymers can be obtained via condensation polymerization, addition polymerization, ring‐opening polymerization, polymer reactions, etc. Ferrocenyl compounds with active groups and ferrocene‐based metal coordination compounds were developed instead of the methods of lengthening the carbon chain of side groups and improving molecular polarity. Also, possible mechanisms of burning rate catalytic activity and migration are discussed and analyzed. Finally, the key points of the development of ferrocene‐based burning rate catalysts and solid composite propellants are proposed. Copyright © 2016 John Wiley & Sons, Ltd.

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“…In the literature, many experimental technologies have been developed, including Fourier-transform infrared spectrometer method, liquid chromatograph method and gas chromatograph method [45]. Huang et al [46] measured the migration of plasticizers, stabilizers at interfaces of the NEPE propellant /HTPB liner/ EPDM insulation at temperatures ranging from 40 C to 70 C using liquid chromatograph method.…”

Section: Experimental Measurementmentioning

confidence: 99%

Review of the Adhesively Bonded Interface in a Solid Rocket Motor

Zhou

Chen

et al. 2015

The Journal of Adhesion

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One of the most challenging requirements in a solid rocket motor (SRM) is the integrity of the charge structure which is a multilayer adhesive joint involving the propellant, liner, and insulation. The propellant/liner/insulation interface is considered to be the weakest part of the whole structure. This interface has some of the usual features of an adhesively bonded interface, as well as its own special characteristics: the co-cured process, ingredient migration between interfaces, and complicated damage mechanisms. We give a technical and critical review of the past fifty years of existing research on many aspects of the propellant/liner/insulation interface in terms of the adhesive properties and adhesive mechanisms, ingredients migration, damage determination, and fracture analysis.To present a comprehensive outline of this interface we also clarify some remaining problems which should be addressed in the future. With significant improvements in the theoretical and experimental studies of the propellant/liner/insulation interface, the problem of integrity failure of the charge structure in SRM will be well resolved. Downloaded by [Cambridge University Library] at 07:15 14 August 2015 2

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Diffusion of plasticizer in a solid propellant based on hydroxyl-terminated polybutadiene

Cited by 12 publications

References 16 publications

Migration kinetics and mechanisms of plasticizers, stabilizers at interfaces of NEPE propellant/HTPB liner/EDPM insulation

Migration kinetics and mechanisms of plasticizers, stabilizers at interfaces of NEPE propellant/HTPB liner/EDPM insulation

Progress on the synthesis and catalytic and anti‐migration properties of ferrocene‐based burning rate catalysts

Review of the Adhesively Bonded Interface in a Solid Rocket Motor

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