Thermal and mechanical characteristics of cork filled insulation for aerospace applications

Gul, Jamal; Saleemi, A.R.; Mirza, S.; Feroze, Nadeem; Mansha, Muhammad

doi:10.1179/174328910x12608851832010

Cited by 12 publications

(14 citation statements)

References 14 publications

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“…Cork is composed of closed cells with a gas similar to the air inside, which promotes a decrease in the density of the parts in which the cork is incorporated (Gul et al, 2013). With the increase in PIAT, it seems to have a slight decrease in density of the parts.…”

Section: Density Of Partsmentioning

confidence: 99%

Processing–Structure–Properties of Cork Polymer Composites

Martins

Gil

2020

Front. Mater.

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This work aims at presenting a new strategy for the use of cork by-products on the development of sustainable composites with potential applications in rotational molding. In this study, different cork granulometries (0.15-3 mm) and matrix/cork ratios (90/10, 85/15, 80/20) are analyzed to access the processability of medium-density polyethylene (MDPE) with cork by rotational molding. The influence of processing parameters, such as the mold peak internal air temperature (PIAT) (200-240 • C), is analyzed and correlated with the aesthetics, morphological and mechanical properties of the parts. The aim is to obtain a complete understanding of the processing-structure-property relationships. Defect-free parts are obtained with thin granulometric cork powders at a maximum of 10% by weight in PE/cork composites. The increase in cork content reduces the sintering capability and increases the porosity, wall thickness, and surface defects, simultaneously weakening the mechanical properties. The increase in PIAT favors a more compact structure and reveals better impact properties. All the parts are soft on touch and transmit the comfort and sensation of warm feeling of the cork. Moreover, lightweight parts and hydrophobic surfaces are achieved from the cork intrinsic properties. As a natural material, cork darkens its color with temperature, which is attributed to the reactions of the extractives within the components of cork, with no degradation associated. The work shows that polymer cork composites (CPC) are suitable for rotational molding within the processing window characteristic of PE, to achieve innovative and sustainable products with unique aesthetics and functionalities given by the cork material.

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Section: Density Of Partsmentioning

confidence: 99%

Processing–Structure–Properties of Cork Polymer Composites

Martins

Gil

2020

Front. Mater.

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“…High thermal conductivity and breakage during compounding are two main disadvantages of the carbon fiber. Meanwhile, Kevlar has low density and low thermal conductivity . The other fibrous fillers such as poly(p‐phenylene benzobisoxazole) (PBO), polysulfonamide, and melamine fibers have also been used instead of the carbon fiber and Kevlar in some cases.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, Kevlar has low density and low thermal conductivity. 13 The other fibrous fillers such as poly(p-phenylene benzobisoxazole) (PBO), 2 polysulfonamide, 14 and melamine fibers 15 have also been used instead of the carbon fiber and Kevlar in some cases. These fibers have ablative resistance better than the Kevlar and carbon fiber in the laboratory tests but their ablative and thermal properties have not been evaluated in the industrial and operational tests.…”

Section: Introductionmentioning

confidence: 99%

Effect of borax on the thermal and mechanical properties of ethylene‐propylene‐diene terpolymer rubber‐based heat insulator

Farajpour

Bayat

Abdollahi

et al. 2015

J of Applied Polymer Sci

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The effect of Borax on the mechanical and ablation properties of three different ethylene‐propylene‐diene terpolymer (EPDM) compounds containing 20 phr carbon fiber, 20 phr Kevlar or 10 phr/ 10 phr carbon fiber/ Kevlar was investigated. All formulations contained 30 phr fumed silica powder and 10 phr paraffinic oil. It was found that adding Borax to the composite samples containing carbon fiber or Kevlar fiber or their mixture with an equal ratio can increase the tensile strength, elastic modulus and hardness with a slightly decrease in the elongation at break of the rubber samples. The results of thermogravimetry analysis (TGA) on the various samples showed significant increase in the char yield at 670°C by adding Borax to the rubber compounds. Moreover, ablation resistance of samples was also improved by increasing Borax content. Meanwhile, density and thermal conductivity of the insulator were also reduced up to about 10% when the carbon fiber was replaced with the Borax. The results indicated that composites containing Kevlar have high storage modulus and produce compact and stable char. EPDM rubber composite containing Borax (20 phr), carbon fiber (10 phr), and Kevlar (10 phr) showed thermal and ablative properties comparable with those of the asbestos‐ filled EPDM. The thermal conductivity and ablation rate of the above‐ mentioned sample were 0.287 W/m/K and 0.13 mm/s respectively. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41936.

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“…Cork presents some remarkable properties, such as,near-zero Poisson coefficient, complete recovery of shape after compression, low density, high thermal and acoustic insulation, damping properties, imperviousness to liquids and resistance to most solvents including mild acidic and basic solutions [3][4][5][6]. This assembly of properties arises from the peculiar morphological structure and chemical composition.Morphologically, it is constituted by hollow polyhedral prismatic cellular arrangement, filled with an air-like gas, which resembles a honeycomb structure [7].…”

Section: Introductionmentioning

confidence: 99%