Synthesis of fly ash cenosphere/polyaniline and mullite/polyaniline core–shell composites

Wang, Wei; Li, Qin; Wang, Bing; Xu, Xiao Tian; Zhai, Jian

doi:10.1016/j.matchemphys.2012.06.020

Cited by 12 publications

(4 citation statements)

References 44 publications

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“…The composition and properties of these solid byproducts are dependent on the coal types and technological processes used in thermal power stations . Besides being a solid waste fly ash offers few precious properties, such as low density, strong filling ability, excellent fluidity, chemical inertness, thermal resistance and being an inactive inorganic host without redox character, and the polymerization can be easily controlled. − Consequently, researchers have shown a great deal of interest in its practical use in various application fields such as construction, agriculture, adsorbents for the heavy metal ions and organic pollutants, and fillers for polymers. − …”

Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Polypyrrole-γ-Fe₂O₃-Fly Ash Nanocomposites for Protection against EMI Pollution

Varshney

Ohlan

Jain

et al. 2014

Ind. Eng. Chem. Res.

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The present paper reports utilization of an industrial byproduct fly ash for potential application by designing nanostick shaped polypyrrole composites decorated with γ-Fe 2 O 3 and fly ash particles via in situ emulsion polymerization. The structural, magnetic, and electromagnetic shielding properties of the composites with varying loading of γ-Fe 2 O 3 and fly ash particles have been investigated. The result indicates that these properties can be optimized by modulating the concentration of the constituents in a polymer matrix. Polypyrrole-γ-Fe 2 O 3 -fly ash nanocomposites have a superparamagnetic nature with an M s value of 13.55 emu/g, electrical conductivity of the order of 10 −2 S/cm, and a maximum SE due to absorption (SE A(max) ) being ca. 17.4 dB. The overall shielding effectiveness (SE = SE A + SE R ) up to 25.5 dB (∼99.7% attenuation) has been recorded for polypyrrole nanocomposites having pyrrole, γ-Fe 2 O 3 , and fly ash in a 1:1:0.5 wt. ratio in the frequency range of 12.4−18 GHz (Ku-band).

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Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Polypyrrole-γ-Fe₂O₃-Fly Ash Nanocomposites for Protection against EMI Pollution

Varshney

Ohlan

Jain

et al. 2014

Ind. Eng. Chem. Res.

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“…At low frequency, this relaxation effect is possibly explained by the intramolecular interactions of hydroxyl groups and intermolecular carbonyl groups in the polymer chain that restrict the alignment of these groups to the applied field . The assembly of these large dipoles throughout the polymer chain at higher frequencies forms a macroscopic polarization . In addition, this polarization behavior also depends on the concentration of filler in matrix.…”

Section: Resultsmentioning

confidence: 99%

Dielectric impedance studies of poly(vinyl butyral)-cenosphere composite films

et al. 2013

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In the current study, amino silane functionalized cenosphere particles was used as a reinforcing filler in poly(vinyl butyral) matrix and were made by melt blending. The changes observed in the dielectric performance of the composite films with varying weight percentage of cenosphere particle in the matrix were investigated. The dielectric property and impedance spectroscopy were evaluated as a function of applied frequency in the range of 50 Hz to 5 MHz. It is observed that, because of orientation polarization of the PVB polymer, the permittivity and impedance decrease, whereas conductivity increases. Tangent loss graph indicates that the property of the matrix is associated with geometrical fill factor and the lowest quality factor. Therefore, above 10 kHz, these composites can be considered as dielectric loss-less material. POLYM. COMPOS., 35:1636-1643, 2014

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“…Enhancement in overall mechanical properties strongly depends on load transfer mechanism which in turn is governed by interfacial bonding between the constituents. 16,17 Gu et al 18 investigated dynamic mechanical analysis and impact toughness of surface-modified cenospheres/ epoxy composites and observed that the composite filled with surface-modified fly ash cenospheres have wider glass transition temperature region and higher loss factor and impact toughness. Wu et al 19 investigated dynamic mechanical analysis of polyurethanemodified epoxy resin filled with silane-treated fly ash particulates and observed higher damping compared to untreated samples and have broad glass transitions temperature peaks.…”

Section: Introductionmentioning

confidence: 99%

Influence of axial compressive loads on buckling and free vibration response of surface-modified fly ash cenosphere/epoxy syntactic foams

Waddar

Pitchaimani

Doddamani

2018

Journal of Composite Materials

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This work deals with experimental buckling and free vibration behavior of silane-treated cenosphere/epoxy syntactic foams subjected to axial compression. Critical buckling loads are computed from compressive load–deflection plots deduced using universal testing machine. Further, compressive loads are applied in the fixed intervals until critical loading point on different set of samples having similar filler loadings to estimate natural frequency associated with the first three transverse bending modes. Increasing filler content increases critical buckling load and natural frequency of syntactic foam composites. Increasing axial compressive load reduce structural stiffness of all the samples under investigation. Syntactic foams registered higher stiffness compared to neat epoxy for all the test loads. Similar observations are noted in case of untreated cenosphere/epoxy foam composites. Silane-modified cenosphere embedded in epoxy matrix registered superior performance (rise in critical buckling load and natural frequencies to the tune of 23.75% and 11.46%, respectively) as compared to untreated ones. Experimental results are compared with the analytical solutions that are derived based on Euler–Bernoulli hypothesis and results are found to be in good agreement. Finally, property map of buckling load as a function of density is presented by extracting values from the available literature.

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Synthesis of fly ash cenosphere/polyaniline and mullite/polyaniline core–shell composites

Cited by 12 publications

References 44 publications

In Situ Synthesis of Polypyrrole-γ-Fe₂O₃-Fly Ash Nanocomposites for Protection against EMI Pollution

In Situ Synthesis of Polypyrrole-γ-Fe₂O₃-Fly Ash Nanocomposites for Protection against EMI Pollution

Dielectric impedance studies of poly(vinyl butyral)-cenosphere composite films

Influence of axial compressive loads on buckling and free vibration response of surface-modified fly ash cenosphere/epoxy syntactic foams

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Synthesis of fly ash cenosphere/polyaniline and mullite/polyaniline core–shell composites

Cited by 12 publications

References 44 publications

In Situ Synthesis of Polypyrrole-γ-Fe2O3-Fly Ash Nanocomposites for Protection against EMI Pollution

In Situ Synthesis of Polypyrrole-γ-Fe2O3-Fly Ash Nanocomposites for Protection against EMI Pollution

Dielectric impedance studies of poly(vinyl butyral)-cenosphere composite films

Influence of axial compressive loads on buckling and free vibration response of surface-modified fly ash cenosphere/epoxy syntactic foams

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Product

Resources

About

In Situ Synthesis of Polypyrrole-γ-Fe₂O₃-Fly Ash Nanocomposites for Protection against EMI Pollution

In Situ Synthesis of Polypyrrole-γ-Fe₂O₃-Fly Ash Nanocomposites for Protection against EMI Pollution