Development of polyimide–nanosilica filled EPDM based light rocket motor insulator compound: Influence of polyimide–nanosilica loading on thermal, ablation, and mechanical properties

Singh, Surya Pratap; Guchhait, Prasanta K.; Bandyopadhyay, G. G.; Chaki, T. K.

doi:10.1016/j.compositesa.2012.08.016

Cited by 77 publications

(34 citation statements)

References 16 publications

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“…Figure represents the plausible mechanism between MaH and EPDM. A comparable trend has been mentioned by Sing et al with maleic anhydride grafted EPDM and the enhancement in tensile strength has been owed by the uniform dispersion of fibers in the matrix that endows better adhesion of KF in the matrix. However, a negligible decrease of about 2% in the elongation at break values has been observed for modified EPDM composition than the corresponding unmodified one.…”

Section: Resultssupporting

confidence: 75%

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

George

Panda

Biswal

et al. 2020

Polymers for Advanced Techs

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This work scrutinizes the utilization of ethylene propylene diene monomer rubber matrix (EPDM) with an embodiment of aramid fiber for the heat shielding applications in solid rocket motor (SRM). Aramid fibers are aromatic poly-paraphenylene terephthalamide, here deployed are Kevlar fibers (KF). However, the literature that encompasses the thermal and mechanical behavior with the fiber loading is reported nowhere else. The effect of fiber addition on the surface morphology and density was thoroughly studied, and it revealed that the EHSMs were of lower density to act as an efficient payload for the SRM. In this regard, the thermal conductivity, heat capacity, thermal diffusivity, fire behavior, and mechanical properties of the EPDM/KF-based EHSMs were explored. The results revealed that the EHSMs are thermally insulating and thermally stable material with balanced mechanical properties that can engender the thermal and mechanical strains of the rocket motor. Furthermore, other analytical techniques such as scanning electron microscopy and energy dispersive X-ray spectroscopy have been exploited to monitor the performance of the char residues of the EHSM to delineate its performance in the fire atmosphere. K E Y W O R D S cone calorimetry, EHSM, Kevlar fiber, SRM, thermal conductivity 1 | INTRODUCTION Thermal protection systems (TPS) grounded on the base of polymeric ablative materials (PAMs) for the safeguard of hypersonic flights in the planetary atmosphere have been probed from the last decades.PAMs are also utilized to endow thermal insulation to the SRMs, which particularly depends on the prerequisite of the application, whether charring or noncharring. 1-3 The high char preservation capable phenolic resins are the foremost manoeuvers typically indentured for solid rocket motors (SRMs). On the other hand, when the charred material undergoes erosion, it necessitates for the fibrous incorporation into the matrix. On these grounds, fibers made of carbon, oxides, asbestos, or glass have been generally employed 4 ; moreover, highly performing organic fibers such as aramid fibers (Kevlar) and polyimide fibers are also used. 4,5 Besides this, micron 6 or nano 7,8 silica is prepended for the elevated ablation rate and char stability and diminished oxidation rate of the residue. Moreover, in the case of flexible insulators that endures for high strain capable applications are met with elastomeric heat shielding materials (EHSMs).Among the various elastomeric materials for SRMs, EPDM is of paramount importance representing an excellent matrix for SRM liners.EPDM holds for superior thermal resistance, reliable mechanical

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Section: Resultssupporting

confidence: 75%

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

George

Panda

Biswal

et al. 2020

Polymers for Advanced Techs

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“…17 Furthermore, Singh et al evaluated the synergistic effect of NS with polyimide fiber for SRM insulation. 18 In addition to this, Zhang et al also demonstrated the influence of octaphenyl polyhedral oligomeric silsesquioxane in the flame retardancy performance of silicone rubber, where they pointed out the excellent improvement in the flame retardancy with the derivative of siloxane. 19 The current investigation reports the synergistic effect of KF and NS onto the EPDM matrix for heat shielding efficiency.…”

Section: Introductionmentioning

confidence: 90%

Thermal insulation behaviour of Ethylene propylene diene monomer rubber/kevlar fiber based hybrid composites containing Nanosilica for solid rocket motor insulation

George

Mohanty

Biswal

et al. 2020

J of Applied Polymer Sci

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The current research discusses the properties of an elastomeric heat-shielding material, based on nano-silica (NS) filled ethylene propylene diene monomer (EPDM) rubber/Kevlar fiber (KF) hybrid composites. The developed elastomeric insulating material consists of an aromatic polyamide fiber (KF) and silica nanoparticles. An in-depth analysis of mechanical properties, density, coefficient of thermal expansion, thermal conductivity, thermogravimetric analysis, and heat release rate of the insulating materials-was performed. TEM micrograph represents an excellent distribution of nanoparticles in the EPDM matrix. The improvement in the mechanical and the flame retardancy of the NS filled EPDM/KF hybrid composite insulations is based on the fiber/ matrix adhesion. Maleic anhydride grafting confers polarity to the nonpolar rubber matrix. The char residues of the insulations inspected by scanning electron microscopy and energy dispersive spectroscopy are depicting a rigid and rough surface by the optimal composites, which can aid in better insulation. The optimal formulation of the hybrid composites exhibited a 220% enhancement in char residue with improved thermal stability and mechanical properties.

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“…These materials have excellent thermal properties of good heat transmission, low CTE they have been successfully uses in the manufacture of aviation engine nozzle and thermal assemblies of the firebox as well as brake discs for airplane in the aeronautical, astronautical, military, and civil fields [1][2][3]. These materials can also protect the space vehicle from the huge amount of heat produced by the friction of the atmosphere, with adsorbing the heat and avoiding its transfer to the interior parts [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of Thermal Properties of Chopped Fiber Composite Materials

Saif¹,

Kamal²,

Kamal³

et al. 2016

The International Conference on Applied Mechanics and Mechanica

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Thermal properties of chopped composites are important parameters for determining application and use of this category of materials. An experimental identification for thermal properties of different composite materials was conducted. In order to investigate the effect of fiber, three different chopped fibers with a phenol resin as a matrix; Carbon fiber, Basalt, and Fiberglass, were selected to determine their thermal properties. Also, the matrix is changed for carbon fiber; phenol resin and epoxy resin, to show the influence of matrix material. Two important parameters were investigated which are the thermal conductivity (TC) and the thermal expansion coefficient (CTE). For the four materials, the thermal conductivity obtained is very low with a range of K = 0.159 w/m °c for the Carbon / Phenol to K = 0.1942 w/m °c for the Carbon / Epoxy, so those materials are used as thermal insulators. On the other side, thermal expansion coefficient has also very low negative values for the Phenol based composites with a range of -146.6 µm/m°c for fiber glass / phenol to -273.7 µm/m°c for carbon fiber / phenol, and for the Epoxy based composites the CTE has a low positive value which is 1049 µm/m°c for carbon fiber / epoxy .

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Development of polyimide–nanosilica filled EPDM based light rocket motor insulator compound: Influence of polyimide–nanosilica loading on thermal, ablation, and mechanical properties

Cited by 77 publications

References 16 publications

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

Ethylene propylene diene monomer rubber‐based heat shielding materials for solid rocket motor: Impact of Kevlar fiber reinforcement on the thermal and mechanical properties

Thermal insulation behaviour of Ethylene propylene diene monomer rubber/kevlar fiber based hybrid composites containing Nanosilica for solid rocket motor insulation

Experimental Determination of Thermal Properties of Chopped Fiber Composite Materials

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