Study on ablative properties and mechanisms of hydrogenated nitrile butadiene rubber (HNBR) composites containing different fillers

Guan, Yue; Zhang, Ling-Xin; Zhang, Liqun; Lu, Yonglai

doi:10.1016/j.polymdegradstab.2011.02.010

Cited by 59 publications

(42 citation statements)

References 30 publications

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“…(MB) was prepared as a novel antioxidant in styrene-butadiene rubber [4]. The hydrogenated acrylonitrile butadiene rubber (HNBR) composites filled with fumed silica was prepared to improve their ablation performance and thermal stability [5]. However, the difficulties as an access to well dispersed silica in rubber matrix are due to the large quantity of hydroxyl groups on the surface of the nanosilica and the high surface energy and polarity, resulting in inferior compatibility and less stability between the rubber matrix and nanosilica; thus severe agglomeration and weak rubber-filler interaction occurred [6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polybutadiene-silica nanoparticles via differential microemulsion polymerization and their hydrogenated nanoparticles by diimide reduction

Tancharernrat

Rempel

Prasassarakich

2015

Polymer Degradation and Stability

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Section: Introductionmentioning

confidence: 99%

Synthesis of polybutadiene-silica nanoparticles via differential microemulsion polymerization and their hydrogenated nanoparticles by diimide reduction

Tancharernrat

Rempel

Prasassarakich

2015

Polymer Degradation and Stability

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“…Some elastomers such as ethylene propylene diene monomer (EPDM) and dimethyl silicone rubber have least specific gravity, which break down endothermically and form a char covering in the course of ablation; however, uncompounded elastomers have poor resistance to surface erosion and processing properties. Hence, elastomers are coupled with additives and inorganic fillers for incorporating specific processing attributes, principally to boost the ablation resistance . Elastomeric materials such as nitrile rubber, silicone rubber, thermoplastic polyurethane (TPU), and ethylene propylene diene rubber are mostly used for making an insulation casing for rocket motor cases.…”

Section: A Focus On Ehsms For Srmmentioning

confidence: 99%

“…It was observed that ablation resistance of the composite becomes great and the thermal conduction, shore A hardness, tensile strength got increased with increasing the phenol formaldehyde in the rubber matrix. Guan et al conducted a study about the ablative properties of the hydrogenated nitrile rubber using fillers such as organically modified montmorillonite and expanded graphite, compromising many polar nitrile groups and reported that rise in ablation rate and a decline in the linear ablation rate of MMT‐reinforced HNBR composite compared to silica or expanded graphite.…”

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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“…Thus, the addition of llers may result in increased thermal and swelling resistance of overall HNBR composite. Several types of llers were used previously to improve properties of HNBR [16] e.g. CNT [17,18] ATH [19] and CB [20] etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of Silica (SiO2) Loading on the Thermal and Swelling Properties of Hydrogenated-Nitrile-Butadiene-Rubber/Silica (HNBR/Silica) Composites

2018

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Abstract:Hydrogenated-Nitrile-Butadiene-Rubber (HNBR) is known for its good physical strength. It is a widely used rubber in electrical insulation and other high performance applications. Performance of HNBR is a ected in high temperature and an aggressive uid environment. Adding silica to HNBR may overcome this problem. In order to investigate the e ect of uids and temperature on HNBR/silica composites we prepared multiple composites of HNBR with 8.3, 16.7, 33.4, 50 and 66.7 phr of silica (SiO ) by two roll compounding method. Swelling index and thermo gravimetric analyses were performed. Calculations of swelling indexes were performed at di erent time periods with ethanol, toluene and water. For thermo gravimetric analysis (TGA), thermo grams of samples were obtained and % char yields at 550• C were analyzed for all samples. Improvements with the addition of silica were recorded up to a great extent in both analyses. Swelling index decreased with the addition of silica as compared to neat HNBR and reached an optimum position with 50 phr silica loading in ethanol, 8.3 phr in water and 66.7 phr in toluene. Moreover, the HNBR composite with 66.7 phr of silica was found to be the highest thermally stable sample and lost less than 60% of weight at 550• C in comparison to neat HNBR in which 80% of weight loss occurred at 550• C.

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Study on ablative properties and mechanisms of hydrogenated nitrile butadiene rubber (HNBR) composites containing different fillers

Cited by 59 publications

References 30 publications

Synthesis of polybutadiene-silica nanoparticles via differential microemulsion polymerization and their hydrogenated nanoparticles by diimide reduction

Synthesis of polybutadiene-silica nanoparticles via differential microemulsion polymerization and their hydrogenated nanoparticles by diimide reduction

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

Influence of Silica (SiO2) Loading on the Thermal and Swelling Properties of Hydrogenated-Nitrile-Butadiene-Rubber/Silica (HNBR/Silica) Composites

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