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Title: Conductive Network and [beta] Polymorph Content Evolution Caused by Thermal Treatment in Carbon Nanotubes-BaTiO[subscript 3] Hybrids Reinforced Polyvinylidene Fluoride Composites

Authors:
; ; ;  [1];  [2]
  1. NWU
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
FOREIGN
OSTI Identifier:
1255293
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry. C; Journal Volume: 120; Journal Issue: (17) ; 05, 2016
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Fan, Benhui, Bedoui, Fahmi, Weigand, Steven, Bai, Jinbo, and CNRS-UMR). Conductive Network and [beta] Polymorph Content Evolution Caused by Thermal Treatment in Carbon Nanotubes-BaTiO[subscript 3] Hybrids Reinforced Polyvinylidene Fluoride Composites. United States: N. p., 2016. Web. doi:10.1021/acs.jpcc.6b01745.
Fan, Benhui, Bedoui, Fahmi, Weigand, Steven, Bai, Jinbo, & CNRS-UMR). Conductive Network and [beta] Polymorph Content Evolution Caused by Thermal Treatment in Carbon Nanotubes-BaTiO[subscript 3] Hybrids Reinforced Polyvinylidene Fluoride Composites. United States. doi:10.1021/acs.jpcc.6b01745.
Fan, Benhui, Bedoui, Fahmi, Weigand, Steven, Bai, Jinbo, and CNRS-UMR). Fri . "Conductive Network and [beta] Polymorph Content Evolution Caused by Thermal Treatment in Carbon Nanotubes-BaTiO[subscript 3] Hybrids Reinforced Polyvinylidene Fluoride Composites". United States. doi:10.1021/acs.jpcc.6b01745.
@article{osti_1255293,
title = {Conductive Network and [beta] Polymorph Content Evolution Caused by Thermal Treatment in Carbon Nanotubes-BaTiO[subscript 3] Hybrids Reinforced Polyvinylidene Fluoride Composites},
author = {Fan, Benhui and Bedoui, Fahmi and Weigand, Steven and Bai, Jinbo and CNRS-UMR)},
abstractNote = {},
doi = {10.1021/acs.jpcc.6b01745},
journal = {Journal of Physical Chemistry. C},
number = (17) ; 05, 2016,
volume = 120,
place = {United States},
year = {Fri Jun 17 00:00:00 EDT 2016},
month = {Fri Jun 17 00:00:00 EDT 2016}
}
  • The ternary nanocomposites of boron nitride nanosheets (BNNSs)/carbon nanotubes (CNTs)/polyvinylidene fluoride (PVDF) are fabricated via a combination of solution casting and extrusion-injection processes. The effects of BNNSs on the electrical conductivity, dielectric behavior, and microstructure changes of CNTs/PVDF binary nanocomposites are systematically investigated. A low percolation value (f{sub c}) for the CNTs/PVDF binary system is obtained due to the integration of solution and melting blending procedures. Two kinds of CNTs/PVDF binary systems with various CNTs contents (f{sub CNTs}) as the matrix are discussed. The results reveal that compared with CNTs/PVDF binary systems at the same f{sub CNTs}, the ternary BNNSs/CNTs/PVDFmore » nanocomposites exhibit largely enhanced dielectric properties due to the improvement of the CNTs dispersion state and the conductive network. The dielectric constant of CNTs/PVDF binary nanocomposite with 6 vol. % CNTs (f{sub CNTs} < f{sub c}) shows a 79.59% enhancement from 49 to 88 after the incorporation of 3 vol. % BNNSs. For the other CNTs/PVDF system with 8 vol. % CNTs (f{sub CNTs} > f{sub c}), it displays a 43.32% improvement from 1325 to 1899 after the addition of 3 vol. % BNNSs. The presence of BNNSs facilitates the formation of the denser conductive network. Meanwhile, the ternary BNNSs/CNTs/PVDF systems exhibit a low dielectric loss. The adjustable dielectric properties could be obtained by employing the ternary systems due to the microstructure changes of nanocomposites.« less
  • Polyvinylidene fluoride-trifluoroethylene [P(VDF-TrFE) 70/30 mol %] copolymer can be transformed from a normal ferroelectric to a relaxor ferroelectric material after proton irradiation. The phase transition peak broadens and shifts towards lower temperature as the measurement frequency decreases. The occurrence of a slim polarization-electric field loop is another evidence of the effect of proton irradiation. In the present study, 0-3 composites are fabricated by incorporating 0.9Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}-0.1PbTiO{sub 3} ceramic powder into a P(VDF-TrFE) 70/30 mol % copolymer matrix. 0.9PMN-0.1PT ceramic is a relaxor ferroelectric with high dielectric permittivity. It was found that the relative permittivity of an unirradiated PMN-PT/P(VDF-TrFE)more » 0-3 composite increases with increasing ceramic volume fraction. With a dosage of 1000 kGy (where 1 Gy=100 rad), the composite exhibits a broad peak in the relative permittivity. In the unirradiated composites, the remnant polarization increases gradually with PMN-PT volume fraction. After irradiation, the remnant polarization of the composites with different PMN-PT volume fractions is similar to that of the irradiated copolymer. Energy storage capabilities of the samples were evaluated which showed that proton irradiated composites have a potential for energy storage applications.« less
  • In a trial to obtain rubber vulcanizates with improved thermal properties, butyl rubber (IIR) loaded with 20 phr BaTiO{sub 3} was mixed with 100 phr of carbon black. In this case different types of carbon blacks, namely HAF, GPF, SRF and LAMP black were used. Electrical conductivity measurements of vulcanized samples were carried out at different applied electric power. The temperature (T) produced as a result of Joule heating effects as a function of time (t) was recorded. It was found that (T-t) characteristics markedly depend on the presence of barium titanate as well as the type of carbon black.more » Theoretical treatment of the obtained results was carried out.« less
  • Highlights: • Carbon fibers are formed in Al{sub 2}O{sub 3}-SiC-C castable composites under the action of nano Ni. • Starting growth temperature is 900 °C and growth mechanism agrees with V–S model. • The high temperature strength of composites can be increased by above 40%. • The thermal shock resistance can be enhanced by above 20%. - Abstract: The spalling and corrosion during the thermal cycles are the main causes of the damages observed in Al{sub 2}O{sub 3}-SiC-C castable composites that are used in molten-iron system. Using the catalyst of nano Ni and ball pitch in the matrix, Al{sub 2}O{submore » 3}-SiC-C castable composites were prepared with the anti-oxidant addition of silicon. The results indicate that the high temperature of the Al{sub 2}O{sub 3}-SiC-C castable composites can be increased by above 42%, and the thermal shock resistance can be enhanced by above 20% because the ball pitch is carbonized and releases C{sub x}H{sub y} vapor, which can be pyrolized to carbon atoms and subsequently deposited into carbon fibers under the catalyst action. The starting temperature of carbon fiber growth is approximately 900 °C, and their diameter and aspect ratio can increase with the rising temperature. The in-situ generation of carbon fibers in Al{sub 2}O{sub 3}-SiC-C castable composites can significantly improve the fibers’ thermo-mechanical properties.« less