Ablative Properties of Polyurethanes Reinforced with Organoclay

Bocchio, Javier; Escobar, Mariano; Amado, Javier Carlos Quagliano

doi:10.1002/pen.25321

Cited by 11 publications

(13 citation statements)

References 37 publications

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“…Lee [56], using matrix as a commercial soft PU, has reached the conclusion that Cloisite® 30B nanoclay displayed a better performance than multiwalled carbon nanotubes (MWCNTs) and carbon nanofibers by preventing the specimen from dripping like the neat material. PU-EHSM based on HTPB/IPDI filled with 5% Cloisite® 30B nanoclay showed a 40% reduction in the ablation rate compared to the unfilled material [57].…”

Section: Polyurethane-based Heat Shielding Materialsmentioning

confidence: 93%

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: Polyurethane-based Heat Shielding Materialsmentioning

confidence: 93%

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

et al. 2020

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“…1−4 They are commonly used to shield aerodynamic surfaces, propulsion systems, and ground equipment from hyperthermal environments. 5,6 With the rapid development of military technology, space vehicles are required to withstand severe and long-term aerodynamic thermal-mechanical environments. 7,8 Simultaneously, the emergence of complex maneuvering structures poses new challenges to external heat shielding technology.…”

Section: Introductionmentioning

confidence: 99%

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

Yan

Cai

Luo

et al. 2021

ACS Appl. Polym. Mater.

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Ablative materials will behave differently when cruising under different hyperthermal environments. Herein, liquid silicone rubber-based composites were employed as a model system to investigate the response behavior of ablative materials under different hyperthermal environments. The computational fluid dynamics simulation was used to examine the flow field of oxyacetylene flame under different heat fluxes. Results indicated that oxyacetylene flames with different heat fluxes have almost identical temperature distributions when the ratio of O2 and C2H2 is fixed, but the scouring force of the gas flow increases significantly with increasing heat flux. The ablation performance decreased when the heat flux increased from 1 to 5 MW/m2, and the ablation mechanism is mainly attributed to the hybrid coupling between mechanical denudation and oxidative erosion. The ceramization reaction to form SiC tended to occur under an inert atmosphere. In addition, the carbon fibers locating on the periphery of the core region tended to assume an orientation state with the progression of the ablation process. This work elaborated the influence of heat flux intensities on the ablative behavior of liquid silicone rubber composites, which also served as a reference to developing other types of ablative materials.

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“…It can be reasonably determined that the main components of the surface layer may be SiO 2 according to the XRD and FTIR results, which is in consistent with our previous study. [ 21 ] During ablation test, the temperature of the flame was around 3000°C, which is much higher than the melting point of SiO 2 (~1700°C). Therefore, the viscous film of molten SiO 2 can be produced and adhered firmly to the ceramic layer, which can serve as a heat shield to decelerate the diffusion of heat and oxygen into inner part and prevent escape of pyrolysis gas.…”

Section: Resultsmentioning

confidence: 99%

“…[ 8–17 ] Nitrile rubber (NBR) and polyurethane is also used for EHSMs. [ 18–22 ] However, some intrinsic shortcomings, such as, a limited shelf life, high density, and poor low temperature properties limit its further application. Among the elastomers used for EHSMs, silicone rubber appeared to be an effective matrix for polymeric TPS.…”

Section: Introductionmentioning

confidence: 99%

A comparison of ablative resistance properties of liquid silicone rubber composites filled with different fibers

Zhang

Yan

Zhou

et al. 2020

Polymer Engineering & Sci

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Flexible ablative materials play a key role in thermal protection systems to protect space vehicles during hypersonic flight missions. In this work, epoxy resin modified liquid silicone rubber was adopted as elastomeric matrix. Two inorganic fibers (carbon fibers (CF) and quartz fibers (QF)) and two organic fibers (aramid fibers (AF) and poly (p‐phenylene benzobisoxazole) fibers (PBO)) were chosen as functional fillers. The ablation resistance and thermal insulation properties were evaluated using oxyacetylene torch test. Microstructure and phase composition of the char layer was fully characterized to investigate the ablation mechanism. SEM observations revealed that the fibers are well dispersed and integrated in the matrix. TGA analysis indicated that the inorganic fibers possess significantly higher thermal stability than organic fibers. In addition, a molten silica film can be formed on the material surface, which can exert a better thermal protection effect on the matrix. Furthermore, the ablation test shows that the linear ablation rate decreases first and then increases with an increase of fiber content. This work provides basic data to guide optimal selection of fibrous ablatives to enhance ablation performance.

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Ablative Properties of Polyurethanes Reinforced with Organoclay

Cited by 11 publications

References 37 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

Ablation Response Behavior under Different Heat Flux Environments for Liquid Silicone Rubber Composites

A comparison of ablative resistance properties of liquid silicone rubber composites filled with different fibers

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