Castable silicone based heat insulations for jet engines

Sandén, Roland

doi:10.1016/s0142-9418(01)00048-4

Cited by 20 publications

(11 citation statements)

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“…Me 2 Si(OMe) 2 and PhSi(OMe) 3 were purchased from Xinan Chemicals (Zhejiang Province, China). 1, 3-divinyl-1, 1, 3, 3tetramethyldisiloxane were supplied by Datian Chemical Auxiliaries Research Institute.…”

Section: Methodsmentioning

confidence: 99%

“…An appropriate amount of hexamethyldisiloxane (MM), 1,3divinyl-1,1,3,3-tetramethyldisiloxane (TMDVS), deionized water, toluene, and catalyst (mixer of hydrochloric acid and trifluoromethanesulfonic acid) were added to a four-necked flask and stirred. Me 2 Si(OMe) 2 and PhSi(OMe) 3 were added dropwise to the above solution and the temperature must be held below 25 C in this procedure, and then the reaction mixture was heated to a backflow temperature for 3 h. The organic phase was washed to neutralize and dried. Then, the target resin was obtained after condensation at 130 C for 5 h. After filtration and removing toluene or MM or TMDVS by evaporation, the vinyl end-capped methylphenyl MDT silicone resins were obtained.…”

Section: Preparation Of Vinyl End-capped Methylphenyl Mdt Resinsmentioning

confidence: 99%

“…Polymethylphenylsiloxane (PMPS)-based silicone rubber has been widely used as antiablation polymer, such as inhibiting of solid rocket propellants and insulation layer of solid rocket motor or ramjet combustor, [1][2][3][4][5] due to its excellent thermal stability and higher carbon residual yield.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and effects of MDT silicone resin on PMPS‐based ablative composites

Peng

et al. 2014

J of Applied Polymer Sci

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A novel methylphenyl silicone resin, with M, D, and T units, was synthesized by cohydrolysis and cocondensation method from dimethyldimethoxysilane (Me 2 Si(OMe) 2 ), phenyltrimethoxysilane (PhSi(OMe) 3 ), hexamethyldisiloxane, and 1,3-divinyl-1,1,3,3tetramethyldisiloxane in toluene/water mixture catalyzed by hydrochloric acid and trifluoromethanesulfonic acid. The vinyl endcapped MDT silicone resins were chosen for reinforcement filler to enhance the mechanical properties of silicone-based ablative composites. The effects of resins with various R/Si ratios, vinyl content, and loadings on mechanical properties of PMPS rubbers were investigated. It was revealed that on the premise of good fluidity and processing performance, MDT resin showed excellent reinforcing effect and thermal stability compared with silica. MDT reinforced ablative composite showed satisfactory mechanical and antiablative properties. The linear ablation rate was 0.01 mm/s, which maybe associated with high yield of charred residue in thermogravimetric analysis results.

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Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Vinyl End-capped Methylphenyl Mdt Resinsmentioning

confidence: 99%

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Synthesis and effects of MDT silicone resin on PMPS‐based ablative composites

Peng

et al. 2014

J of Applied Polymer Sci

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“…Silicon rubber composite comprising silica, SiC, and carbon fibers established by Dow Corning Corporation confronted a test flight successfully . Sanden developed a higher heat‐resistant silicon‐based insulating material by mixing silicon rubber materials from Dow Corning and General Electric Company. Kim and his crew conducted a study about the thermal stability and ablation properties of the silicon rubber composites with clay and carbon fiber and found out that addition of carbon fibers may lower thermal stability of the composite.…”

Section: A Focus On Ehsms For Srmmentioning

confidence: 99%

Recent developments in elastomeric heat shielding materials for solid rocket motor casing application for future perspective

George

Panda

Mohanty

et al. 2017

Polymers for Advanced Techs

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Catastrophic breakdown that occurs during the flight of supersonic vehicles demands more focused research in the insulation of rocket engines. At present, optimization of polymeric ablatives as viable insulation for solid rocket motor casing has a prominent role in the successful mission of rockets. Among polymers, elastomer serves an imperative part. Comprehensive investigations were disclosed, especially in the elastomeric heat shielding materials with various reinforcing agents. In this paper, research progress of mostly used elastomers is reviewed, and a circumstantial understanding about the features of ablation and insulation has been validated. 2-4 Therefore, to protect the vehicle from miserable failure of spacecraft, some design features are added to cope with the aerodynamic heating. 5Thermal protection system (TPS) materials impart heat shield to protect the structure, aerodynamic surface and the payload of missiles, and those vehicles interacting with the hypersonic environment. 6,7 Polymeric ablative materials serve to effect as TPS that defends space vehicles and probes during the atmospheric entry; they are effective to produce passively cooled rocket combustion chambers 8 and to render insulation to the solid rocket motors (SRMs) at high temperature. [9][10][11] Although some nonpolymeric materials such as inorganic polymers/ceramics or metals have been used as ablative TPS, polymeric ablatives represent the most flexible category of ablatives. In contrast to the inorganic polymers, polymer ablatives have more inborn benefits: high-heat shock resistance, lower density, good mechanical strength, and thermal insulation capabilities. 12The broad range of heat shielding materials (HSMs) for rocket motor casing is produced from reinforced thermosets or elastomers. [13][14][15][16][17][18][19] The most assuring material for the HSM for rocket motors is the elastomers, which can be produced as rubbers, foamed rubbers, or fiber-reinforced composite materials. On the grounds of lightweight, low thermal conductivity, stability in the mechanical and thermal stresses during the operation, elastomeric HSMs (EHSMs) can find relevance in the insulation of SRM casing where thermal insulation is a prime necessity. They do not possess the ability to form cokes without the introduction of special additives due to the linear chain structure of elastomers, thus no solid carbonic residue on thermal decomposition.Also, elastomers have high elongation at break and the capacity to withstand the mechanical and the thermal stresses during the manufacturing and in use. 20This review puts the elastomeric materials as ablative insulators for SRM into frame and would confer the readers the progress that has been attained in developing relatively low surface eroding and ablative insulating systems for SRM. These systems can be used to manufacture variety of ablative TPS systems for rocket motor casing application and would provide an idea regarding the composite system that would behave elastomeric as well as ablative. Scrutini...

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“…1,2 Due to these excellent properties, polysiloxane elastomers are widely used in aerospace industry, automobile industry, electronic industry, and biomedical applications. [2][3][4][5][6] However, most of polysiloxane elastomers have weak oil resistance, which seriously limit their practical application. Therefore, the production and consumption of polysiloxane elastomers would be significantly higher if the product could offer better resistance to oils.…”

Section: Introductionmentioning

confidence: 99%

Oil resistance and mechanical properties of polysiloxane nanocomposites prepared by in situ reaction of reactive polar monomers

Yang

Chu

Liu

et al. 2014

J of Applied Polymer Sci

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A series of poly(methylvinylsiloxane) elastomer (VMQ) composites with improved oil resistance were prepared by introducing uniform polar polymer phases into VMQ matrix through the in situ reaction of reactive polar monomers—hydroxyethyl methacrylate (HEMA) and hydroxypropyl methacrylate (HPMA)—during peroxide curing. Differential scanning calorimetry and Fourier transform infrared measurements demonstrated that HEMA and HPMA had high reactivity and most of the monomers participated in the in situ reaction during peroxide curing. Transmission electron microscopic images showed that the uniform nanophases with the diameters in the range of 20–50 nm formed in the VMQ vulcanizates. The generated nanophases could interact with silica to form a strong filler network in the VMQ matrix, resulting in a significant increase of the modulus at low elongation of the VMQ vulcanizates. With increasing the content of polar monomers, the tensile strength decreased slightly, the elongation at break, the hardness and the 100% modulus increased, but the 300% modulus decreased significantly due to the decrease of the crosslink density. The incorporation of HEMA or HPMA into VMQ matrix could significantly improve the oil resistance of polysiloxane elastomer, and the oil resistance of the composites containing HEMA was a little better than that of the composites containing HPMA. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40983.

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Castable silicone based heat insulations for jet engines

Cited by 20 publications

References 1 publication

Synthesis and effects of MDT silicone resin on PMPS‐based ablative composites

Synthesis and effects of MDT silicone resin on PMPS‐based ablative composites

Recent developments in elastomeric heat shielding materials for solid rocket motor casing application for future perspective

Oil resistance and mechanical properties of polysiloxane nanocomposites prepared by in situ reaction of reactive polar monomers

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