Synthesis of high-density polyethylene/rGO-CNT-Fe nanocomposites with outstanding magnetic and electrical properties
Author
dc.contributor.author
Nisar, Muhammad
Author
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Pérez Bergmann, Carlos
Author
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Geshev, Julián
Author
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Quijada Abarca, Juan
Author
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Maraschin, Thuany
Author
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de Souza Basso, Nara R.
Author
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Barrera, Eliana G.
Author
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Galland, Griselda Barrera
Admission date
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2019-05-29T13:30:26Z
Available date
dc.date.available
2019-05-29T13:30:26Z
Publication date
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2017
Cita de ítem
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Journal of Applied Polymer Science, Volumen 134, Issue 40, 2017,
Identifier
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10974628
Identifier
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00218995
Identifier
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10.1002/app.45382
Identifier
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https://repositorio.uchile.cl/handle/2250/168935
Abstract
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Semi-conducting polyethylene (PE) nanocomposites with outstanding magnetic properties at room temperature were synthesized.
These exceptional properties, for a diamagnetic and insulating matrix as PE, were obtained by polymerizing ethylene in the
presence of a catalytic system formed by a metallocene catalyst supported on a mixture of reduced graphene oxide (rGO) and carbon
nanotubes with encapsulated iron (CNT-Fe). It was used a constant and very low amount of CNT-Fe, obtained by vapor chemical
deposition using ferrocene. The percolation threshold, to achieve conductivity, was obtained using a variable amount of rGO. The
nanocomposites were semiconductors with the addition of 2.8 wt % and 6.0 wt % of the filler, with electrical conductivities of 4.99
3 1026 S cm21 and 7.29 3 1024 S cm21, respectively. Very high coercivity values of 890–980 Oe at room temperature were achieved
by the presence of only 0.04–0.06 wt % of iron in the nanocomposites. The novelty of this work is the production of a thermoplastic
with both, magnetic and electric properties at room temperature, by the use of two fillers, that is rGO and CNT-Fe. The use of a
small amount of CNT-Fe to produce the magnetic properties and variable amount of rGO to introduce the electrical conductivity in
PE matrix let to balance both properties. The encapsulation strategy used to obtain Fe in CNT, protect Fe from easy oxidation and
aggregation.