Effect of Insulation Layer Composite and Water Adsorption on Bonding Performance in Heat Barriers

Awad, Mahmoud E.; Nasser, Mohamed

doi:10.33945/sami/ajca.2020.3.15

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…From this point of view, PU-EHSM is better as insulation materials because insulator and propellant are of the same chemical nature. Interfacial bonding of NBR and EPDM to HTPB/IPDI composite propellant revealed that both types of insulation layers considerably decreased bonding [64]. This can be expected, considering the different chemical nature of EPDM and NBR compared to the PU-cured propellant.…”

Section: Bonding Of Ehsm To Composite Propellantmentioning

confidence: 66%

Evaluation of elastomeric heat shielding materials as insulators for solid propellant rocket motors: A short review

et al. 2020

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This review addresses a comparison, based on the literature, among nitrile rubber (NBR), ethylene-propylene-diene-monomer rubber (EPDM), and polyurethane (PU) elastomeric heat shielding materials (EHSM). Currently, these are utilized for the insulation of rocket engines to prevent catastrophic breakdown if combustion gases from propellant reaches the motor case. The objective of this review is to evaluate the performance of PU–EHSM, NBR–EHSM, and EPDM–EHSM as insulators, the latter being the current state of the art in solid rocket motor (SRM) internal insulation. From our review, PU–EHSM emerged as an alternative to EPDM–EHSM because of their easier processability and compatibility with composite propellant. With the appropriate reinforcement and concentration in the rubber, they could replace EPDM in certain applications such as rocket motors filled with composite propellant. A critical assessment and future trends are included. Rubber composites novelties as EHSM employs specialty fillers, such as carbon nanotubes, graphene, polyhedral oligosilsesquioxane (POSS), nanofibers, nanoparticles, and high-performance engineering polymers such as polyetherimide and polyphosphazenes.

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Section: Bonding Of Ehsm To Composite Propellantmentioning

confidence: 66%

Evaluation of elastomeric heat shielding materials as insulators for solid propellant rocket motors: A short review

et al. 2020

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“…On the other hand, the lower the functionality, the higher the molecular mass, and the more elastic network is obtained for a given number of functional groups. Network structure can be regulated through the isocyanate/hydroxyl ratio [88]. Temperature-humidity conditions are fundamental in attaining the proper cure [89].…”

Section: Curing Kinetics Of Htpb With Isocyanates and "Potlife"mentioning

confidence: 99%

Properties of Hydroxyl‐Terminal Polybutadiene (HTPB) and Its Use as a Liner and Binder for Composite Propellants: A Review of Recent Advances

Amado

Ross

Murakami

et al. 2022

Propellants Explo Pyrotec

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This paper reviews hydroxyl-terminal polybutadiene (HTPB) used as liner and binder for composite propellants, applied in rocket motors studied throughout the last decades, emphasizing the recent advances. The contribution aims to show the importance of HTPB in the propellant composition and on the liner coating of the rocket motor, which is in contact with the propellant grain. This paper also shows that many researchers have thoroughly studied several properties of HTPB, which are rele-vant to its role in liners and propellants. We have also reviewed analytical techniques such as Fourier Transform Infrared Spectroscopy (FTIR) as a characterization technique for HTPB and HTPB-based polyurethanes. Reflection and transfectants FTIR may be a future trend in studies about polymeric matrices for liners and propellants, and in the area of propellant formulations that use energetic binders, graphene and nanomaterials.

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“…A layer of insulation material is always needed to provide thermal protection from combustion gases over the in-ternal surface of the motor case [5][6][7][8]. This layer is typically vulcanized rubber consisting of filling material.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of Labile Chemical Species in HTPB and HTPB‐XT Solid Propellants and Its Effect over Solid Rocket Motor Properties on Aging – A Study

Selvasekarapandian

Rao

Reddy

2021

Propellants Explo Pyrotec

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Hydroxyl terminated polybutadiene resin (HTPB) based solid propellants are being currently used in solid rocket motors of launch vehicles. HTPB-XT (HTPB blended with the hydrocarbon oil, Extol-21) was developed to enhance the pot life of the propellant slurry and to overcome the problems in the propellant processing due to the shorter pot life of present HTPB propellants. The diffusion study of labile chemical species in HTPB and HTPB-XT propellants (with low and high viscosity hydrocarbon oils) was carried out. Analog cartons simulating the propellant of the main motor were cast with 120 kg mix level propellant and subjected to an aging study at room temperature and an accelerated condition at different intervals over a period of 100 days. Samples from the cartons were subjected to Soxhlet extraction and analyzed for concentration of chem-ical species in insulation rubber as well as in propellant. The change in concentration of species from the insulation to interior propellant was also studied and compared with HTPB propellant. The diffusion of the other chemicals along with plasticizer was also observed in these studies. Nonax-D, a solid ingredient also migrated due to its solubility in the propellant matrix but not due to the movement of solid particles. Due to the migration of propellant chemicals into insulation, there was a significant reduction in their initial concentrations in the propellant regions adjacent to the insulation surface. The rate of diffusion of the chemically unbound species was affected by temperature and time. The results of viscosity build-up, mechanical, interfacial, ballistic properties for HTPB and HTPB-XT propellants are presented and discussed.

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Effect of Insulation Layer Composite and Water Adsorption on Bonding Performance in Heat Barriers

Cited by 7 publications

References 10 publications

Evaluation of elastomeric heat shielding materials as insulators for solid propellant rocket motors: A short review

Evaluation of elastomeric heat shielding materials as insulators for solid propellant rocket motors: A short review

Properties of Hydroxyl‐Terminal Polybutadiene (HTPB) and Its Use as a Liner and Binder for Composite Propellants: A Review of Recent Advances

Diffusion of Labile Chemical Species in HTPB and HTPB‐XT Solid Propellants and Its Effect over Solid Rocket Motor Properties on Aging – A Study

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