Effect of heat treatment of carbon nanofibers on the electromagnetic shielding effectiveness of linear low density polyethylene nanocomposites

Villacorta, Byron; Ogale, Amod A.; Hubing, T.H.

doi:10.1002/pen.23276

Cited by 27 publications

(23 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fig. For instance, 15 dB g À1 cm 3 for polyethylene-carbon ber composites with 20 wt% (11 vol%) carbon ber loading, 61 35.3 dB g À1 cm 3 for reduced graphene oxide (rGO)/epoxy composites containing 2 wt% rGO, 62 and 500 dB g À1 cm 3 graphene/polydimethylsiloxane (PDMS) foams with 0.8 wt% (about 0.037 vol%) graphene loading 63 were achieved at 30 MHz to 1.5 GHz, respectively. Inset shows their specic SE at 200 MHz, 600 MHz, 1000 MHz and 9.6 GHz.…”

Section: Emi Shielding Performance Of Silver Nanollers/ Polyimide Comentioning

confidence: 99%

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

2015

View full text Add to dashboard Cite

Silver nanofillers of three different shapes were synthesized: silver nanospheres (AgNSs), silver nanowires (AgNWs) and silver nanowires-silver nanoplatelets (AgNWPs). Ultra-lightweight polyimide (PI) composite foams filled with these three silver nanofillers were fabricated by a facile and effective one-pot liquid foaming process, respectively. Their microstructure, electromagnetic interference (EMI) shielding effectiveness (SE) and shielding mechanisms were investigated. It was found that, at the same nanofiller loading, the EMI SE of the composite foams decreased in the following order: AgNWPs > AgNWs > AgNSs. AgNWPs/PI composite foams exhibited the highest EMI SE owing to the denser 3D conductive network of AgNWPs compared to AgNWs and AgNSs, in which the seamlessly interconnected AgNWPs network provided fast electron transport channels inside foams. Maximum specific EMI SE values of 1208 dB g À1 cm 3 at 200 MHz, 650 dB g À1 cm 3 at 600 MHz, and 488 dB g À1 cm 3 in the frequency ranges of 800-1500 MHz, 216-249 dB g À1 cm 3 at 8-12 GHz were achieved in the composite foams at 4.5 wt% AgNWPs loading, which far surpass the best values of other composite materials. The reflections of interconnected AgNWPs networks inside the foams combined with absorptions resulting from the multiple reflections at interfaces inside the foams contributed to the shielding effect. This suggests that our AgNWPs/PI composite foams have excellent potential as high-performance EMI shielding materials against electromagnetic interference pollution in applications that need lightweight. Fig. 7 Dispersion of silver nanostructures in composite foams for PIF-P, PIF-W and PIF-WS: (middle) FESEM images of cell walls; (left) FESEM images of the distribution of silver nanostructures in cell membranes; (right) FESEM images of the distribution of silver nanostructures in cell walls.This journal is

show abstract

Section: Emi Shielding Performance Of Silver Nanollers/ Polyimide Comentioning

confidence: 99%

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

2015

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 76%

“…The assessment of graphitic crystallographic characteristics of carbonaceous materials can be primarily carried out by XRD . For graphitic carbon, X‐ray diffractograms display prominent peaks at about 26°, 42°, and 44° Bragg's angular positions (2θ) corresponding to reflections of the (002), (100), and (101) planes, respectively .…”

Section: Resultsmentioning

confidence: 99%

“…The intrinsic electrical conductivity of the modifier phase is an important factor in determining the electrical properties of the resulting composites . This conductivity, in turn, is a strong function of its graphitic crystallinity, which can be increased by heat‐treating the nanomodifiers to temperatures exceeding 2000°C as demonstrated in previous studies . Therefore, ultra‐high temperature heat treatment (HT) at 2500°C was carried out for all of the as‐received nanomodifiers in a Thermal Technology HP50‐7010 furnace in helium atmosphere prior to compounding …”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Morphological influence of carbon modifiers on the electromagnetic shielding of their linear low density polyethylene composites

Villacorta

Ogale

2014

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

The influence of morphology of carbon modifiers on the electrical, thermal, and mechanical properties of their polyethylene‐matrix composites is reported. Four heat‐treated (HT) carbon modifiers were investigated: PR‐19‐HT carbon nanofibers, multiwalled carbon nanotubes (MWNT‐HT), helical multiwalled carbon nanotubes (HCNT‐HT), and mesophase pitch‐based P‐55 carbon fibers as a control. These were melt‐mixed with linear low density polyethylene at 10 vol %, which was above the percolation threshold. The electromagnetic shielding effectiveness (EM SE) of the composites exhibits significant dependence on the modifier morphology. Thus, MWHTs, with the highest aspect ratio, lead to the highest composite electrical and thermal conductivities (34 Sm−1 and 1 Wm−1 K−1) and EM SE (∼24 dB). In contrast, HCNT, due to their coiled shape and low aspect ratio, lead to segregated microstructure and low EM SE (<1 dB). However, these composites display the highest ductility (∼250%) and flexibility, probably due to matrix‐modifier mechanical bonding provided by the helical morphology. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41055.

show abstract

“…For example, in cyclic butylene terephthalate/graphite/ carbon black composites, 8 the addition of CB increases the EMI SE of graphite/polybutylene terephthalate composites to 60 dB or so in the range of 30 MHz to 3 GHz. Villacorta et al 9 found that a treated carbon fiber-based polyethylene composite has a resistivity of 10 5 X cm and an EMI SE of 15 dB (30 MHz to 1.5 GHz). Gnidakouong et al 10 added multiwalled carbon nanotubes into unsaturated polyester and obtained a composite with an EMI SE above 20 dB in the range of 30-1.5 GHz.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic interference properties of carbon nanofiber–reinforced acrylonitrile–styrene–acrylate/natural graphite composites

Song

Zhang

et al. 2017

J of Applied Polymer Sci

View full text Add to dashboard Cite

Acrylonitrile–styrene–acrylate/natural graphite/carbon nanofiber composites (ASA/NG/CNF) were prepared using a melting blending method. The effects of CNFs on the morphology, rheological properties, dynamical mechanical properties, electrical resistivity, and electromagnetic interference shielding effectiveness (EMI SE) were studied using a scanning electron microscope, a rotational rheometer, and dynamic mechanical analysis (DMA). The addition of CNFs changed the oriented and laminated structure of the ASA/NG composite. The flexural strength of the ASA composite reached a maximum at 6% CNF, and then it began to decrease. The addition of CNFs did not alter the glass‐transition temperature of ASA, but it largely increased the storage modulus of the composite in DMA tests. In the rheological measurements, the complex viscosity and storage modulus of the composite increased as CNF content increased, and the resistance to creep of the composites was significantly increased by the addition of CNFs. The electrical resistivity of the ASA composites decreased from 49.8 Ω cm to 2.3 Ω cm as the CNF content was increased from 0 to 12%. At the same time, the EMI properties of the composites rose from 15 dB to 30 dB in the frequency range 30–1500 MHz. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45455.

show abstract

Effect of heat treatment of carbon nanofibers on the electromagnetic shielding effectiveness of linear low density polyethylene nanocomposites

Cited by 27 publications

References 26 publications

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

Morphological influence of carbon modifiers on the electromagnetic shielding of their linear low density polyethylene composites

Electromagnetic interference properties of carbon nanofiber–reinforced acrylonitrile–styrene–acrylate/natural graphite composites

Contact Info

Product

Resources

About