Effect of processing method on microstructure, electrical conductivity and electromagnetic wave interference (EMI) shielding performance of carbon nanofiber filled thermoplastic polyurethane composites

Kaşgöz, Alper; Korkmaz, Mehmet; Alanalp, Mine Begum; Durmuş, Ali

doi:10.1007/s10965-017-1312-6

Cited by 19 publications

(21 citation statements)

References 36 publications

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“…22 The percolation threshold for the electrical conductivity in these composites is closely related to the dispersion state of carbon nanotubes, 248,300-303 alignment, 304,305 dimensions (e.g., length and diameter) of carbon nanotubes, 300,303,[306][307][308][309][310] degree of modication of the surface of carbon nanotubes, [310][311][312] type of polymers, 313 and composite processing method. 300,[314][315][316] The percolation threshold is strongly dependent upon the degree of the dispersion of carbon nanotubes. Additionally, alignment of carbon nanotubes plays an important role in determining the electrical conductivity of the nanocomposite and its percolation threshold.…”

Section: Electrical Propertiesmentioning

confidence: 99%

A review of the interfacial characteristics of polymer nanocomposites containing carbon nanotubes

et al. 2018

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Section: Electrical Propertiesmentioning

confidence: 99%

A review of the interfacial characteristics of polymer nanocomposites containing carbon nanotubes

et al. 2018

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“…They have found that the polymer composites synthesized by solution‐cum‐melt mixing process provides higher mechanical strength, larger conductivity and electromagnetic shielding effectiveness as compared to the melt mixing process. Effect of synthesis method on the conductivity and shielding properties of carbon nanofiber dispersed polyurethane composites have been studied by Kasgoz et al 25 They have prepared polymer composites by three methods namely: (a) melt compounding (MC), (b) simple solution mixing (SM) on a magnetic stirrer and (c) solution mixing with ultra‐sonication (SM‐U). It has been observed that for the same amount of filler loading, conductivity of the composites varies in order of SM > SM‐U > MC.…”

Section: Introductionmentioning

confidence: 99%

Magneto‐dielectricandmagneto‐conductingfillers based polymer composites: Effect of functionalization, coating and dispersion process on electromagnetic shielding properties

Vyas

Chandra

2021

J of Applied Polymer Sci

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Electromagnetic interference shielding of magneto-dielectric (BaTiO 3-Fe 3 O 4) and magneto-conducting (f-MWCNT-Fe 3 O 4) fillers based polymer electrolyte composites in the X-band have been studied in the present work. Magnetodielectric and magneto-conducting fillers have been obtained by in situ preparation of Fe 3 O 4 nanoparticles by chemical precipitation in the presence of BaTiO 3 and functionalized multiwalled carbon nanotubes (f-MWCNT). Functionalization of MWCNT has resulted in their strong bonding with the polymer electrolyte adversely affecting the charge transport properties and shielding effectiveness. Dielectric, magnetic and conducting properties of the magnetodielectric and magneto-conducting fillers are found to be significantly different as a result of coating by Fe 3 O 4 nanoparticles on BaTiO 3 and f-MWCNT. Combining two fillers in a single nanocomposite has exhibited non-complimentary addition of their individual properties. The ultra-sonication method of dispersion of the magneto-conducting filler has been found to give better conducting and shielding effectiveness in comparison to the homogenization method due to better disentanglement of the nanotubes.

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“…[30] Generally, the ability of carbon-filled polymeric composites to interact with electromagnetic waves is not only related to the intrinsic (ie, conductivity, complex permittivity, and permeability) properties of the fillers and polymers but also their physical and microstructural properties (ie, size, aspect ratio, dispersion, and orientation of filler particles). [31][32][33] This belief may be supported by variations in the dielectric properties, [32,34] electromagnetic shielding, [32,35,36] or RADAR absorbing performance [32,33] of the composite samples with similar content and compositions in the literature. Thus, determination of morphological and microstructural properties is crucial to establish structure-property relationships.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the microwave attenuation performance and structure‐property relationship for graphite‐filled cyclo‐olefin copolymer composites

Kurt

Kaşgöz

2020

Polymer Composites

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This study examined the morphological, rheological, viscoelastic, electrical, and microwave attenuation properties (RADAR absorbent and EMI shielding) of cyclo‐olefin copolymer (COC) composites prepared with the melt mixing method by using different amounts of graphite (0‐75 phr). Rheological percolation threshold of the graphite was determined as ∼38 phr. The RL analyses of the composites showed that the composites containing a moderate filler content (45 phr) exhibited the best radar absorption performance. Absorption bandwidth and minimum reflection loss (RL) value for the sample containing 45 phr of graphite were determined as 2.335 GHz (10.165‐12.5 GHz) and −39.89 dB, respectively. Total shielding effectiveness (SET) values of the sample including 75 phr of graphite varied in the ranges of 30 to 47.5 dB for the sample thicknesses of 7 mm. The correlation of the microstructural parameters and microwave attenuation properties of the composites indicated that the minimum RL value could be obtained at a filler concentration close to the rheological and electrical percolation thresholds. However, it was also revealed that acceptable shielding effectiveness values for commercial applications could be obtained by the samples with higher filler concentrations than the electrical percolation threshold.

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Effect of processing method on microstructure, electrical conductivity and electromagnetic wave interference (EMI) shielding performance of carbon nanofiber filled thermoplastic polyurethane composites

Cited by 19 publications

References 36 publications

A review of the interfacial characteristics of polymer nanocomposites containing carbon nanotubes

A review of the interfacial characteristics of polymer nanocomposites containing carbon nanotubes

Magneto‐dielectricandmagneto‐conductingfillers based polymer composites: Effect of functionalization, coating and dispersion process on electromagnetic shielding properties

Investigation of the microwave attenuation performance and structure‐property relationship for graphite‐filled cyclo‐olefin copolymer composites

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