double ptc effect of carbon nanotubes filled immiscible
High performance hybrid carbon fillers/binary–polymer
By introducing 0.5 vol CNTs into the 4 vol CB filled UHMWPE 0.8 –PVDF 0.2 composites the initial resistivity decreased by about two orders of magnitude and the PTC intensity (PTCI) increased by
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Feng JY Chan CM (2000) Double positive temperature coefficient effects of carbon black-filled polymer blends containing two semicrystalline polymers.
Get PriceFactors influencing the resistivity–temperature behavior
Apr 01 2014 · The relationship between morphology and resistivity–temperature behavior of carbon black (CB) filled isotactic polypropylene/high density polyethylene (iPP/HDPE) composites was investigated. The positive temperature coefficient intensity for all composites studied in this paper was lower than one and the negative temperature coefficient (NTC) effect was obvious. The factors
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Dec 27 2006 · The PE/POM‐Fe composites demonstrate double‐positive temperature coefficient (PTC) effect with the presence of two transitions and a plateau between them.
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Feb 11 2008 · Conductive polymer composites with double percolated architecture of carbon nanoparticles and ceramic microparticles for high heat dissipation and sharp PTC switching G Droval 1 2 J F Feller 1 P Salagnac 2 and P Glouannec 2
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Mar 01 2017 · Zha et al. explored the PTC effect of immiscible polymerblends ultra-high molecular weight polyethylene (UHMWPE)/polyvinylidene fluoride (PVDF) = 4 1 based composites containing hybrid fillers carbon nanotubes (CNTs) and carbon black (CB) and they found both of the PTC intensity (I PTC = log(ρ max /ρ RT) where ρ max is the maximum
Get PriceSelection of Immiscible Polymer Blends Filled with Carbon
Selection of Immiscible Polymer Blends Filled with Carbon Nanotubes for Heating Applications and Joule effect) cases and 0.16 wt. for polystyrene filled with carbon nanotubes. Miles et al
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MWCNTs-filled immiscible polymer composites with lower percolation threshold are cost-effective materials which can be manufactured on a large scale and widely used in positive temperature coefficient (PTC) materials electromagnetic interference shielding and composite bipolar plates. 39-41
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Jun 01 2020 · 1. Introduction. Electrically conductive polymer composites (CPCs) which were generally composed of polymer matrix and conductive fillers such as carbon nanotubes (CNTs) carbon black (CB) 5 6 graphite 7 8 graphene 9 10 and metal particles have attracted the wide interest in both science research and practical application due to the electrical thermal and mechanical
Get PriceInfluence of annealing on conduction of high‐density
The high‐density polyethylene/carbon black (HDPE/CB) composite with a CB volume fraction of 0.113 is isothermally annealed at various temperatures from 116 to 149°C covering the positive temperature coefficient (PTC) transition and the negative temperature coefficient regions during heating as well as from 149 to 122°C above the reverse‐PTC transition during cooling.
Get PriceLocalization behavior of multiwalled carbon nanotubes in
blend phases in immiscible or compatible polymer blends having co-continuous morphology. This concept is known as double percolation and was initially described by Sum-ita et al. (1991 1992) for carbon black filled immiscible polymer blends and it has been applied for CNT filled polymer composites (Maiti et al. 2013 Poyekar et al. 2015).
Get PriceUSA1Use of carbon nanotubes for the
The invention relates to the use of carbon nanotubes for the production of an electrically-conductive organic composition having an electrical resistivity that is constant as a function of temperature and to the applications of said compositions. The conductive organic composition has a temperature-insensitive electrical resistivity and a temperature-insensitive thermal conductivity.
Get PriceInfluence of morphology on PTC effect for poly (ethylene
Nov 14 2013 · Multiwall carbon nanotubes (MWCNTs) filled poly (ethylene-co-butyl acrylate)/nylon6 (EBA/PA6) blends were prepared by melt-mixing method. MWCNTs were localized in PA6 phase and the percolation threshold was 6 wt . A weak PTC (positive temperature coefficient) effect was observed. The method that EBA-g-MAH was first reacted with MWCNTs and then blended with EBA/PA6 was
Get PriceCarbon black–filled immiscible blends of poly(vinylidene
An increase in CB content in the composites with a fixed PVDF/HDPE volume ratio (1/1) and an increase in PVDF content in composites with a fixed CB content (10 wt ) greatly decreased the domain size of the PVDF phase. A positive‐temperature‐coefficient effect was used to
Get PriceThermoelectric behavior (PTC) of carbon black‐containing
This unusual CB distribution results in a reduced percolation threshold of all blends. A double‐PTC effect is exhibited by the XL‐UHMWPE‐containing samples. Irradiation of compression‐molded plaques improves their thermoelectric behavior by amplifying the PTC effect and reducing the NTC effect.
Get PriceHigh performance hybrid carbon fillers/binary–polymer
By introducing 0.5 vol CNTs into the 4 vol CB filled UHMWPE 0.8 –PVDF 0.2 composites the initial resistivity decreased by about two orders of magnitude and the PTC intensity (PTCI) increased by
Get PriceInfluence of Noncovalent Modification on Dispersion State
Multiwalled carbon nanotubes (MWNTs) were melt-mixed with polyamide6 (PA6) and acrylonitrile butadiene styrene copolymer (ABS) to obtain electrically conducting composites. MWNTs were noncovalently modified with sodium salt of 6-aminocaproic acid (MWNTs-m1) and 3-pyrenealdehyde (MWNTs-m2) to deagglomerate MWNTs. Raman spectroscopic analysis indicated a G-band shift
Get PriceInfluence of morphology on PTC effect for poly (ethylene
Nov 14 2013 · Multiwall carbon nanotubes (MWCNTs) filled poly (ethylene-co-butyl acrylate)/nylon6 (EBA/PA6) blends were prepared by melt-mixing method. MWCNTs were localized in PA6 phase and the percolation threshold was 6 wt . A weak PTC (positive temperature coefficient) effect was observed.
Get PriceTriple percolation behavior and positive temperature
Double PTC effect of carbon nanotubes filled immiscible polymer blends. Article. May 2014 C. Lu D. Yang R. Wang Y. Zhang A double-positive temperature coefficient (PTC) effect was
Get PriceUSA1Use of carbon nanotubes for the
The invention relates to the use of carbon nanotubes for the production of an electrically-conductive organic composition having an electrical resistivity that is constant as a function of temperature and to the applications of said compositions. The conductive organic composition has a temperature-insensitive electrical resistivity and a temperature-insensitive thermal conductivity.
Get PricePositive Temperature Coefficient (PTC) Evolution of
PTC intensity (PTC intensity is defined as I PTC = log(ρρ maxR /) T where ρ max is the maximum resistivity in the heating process ρ RT is the original resistivity at room temperature). To reveal the mechanism of the PTC effect the ρ-T behavior was investigated further after prolonged thermal treatment at 200 C. The micro° -
Get PriceTriple percolation behavior and positive temperature
Feng JY Chan CM (2000) Double positive temperature coefficient effects of carbon black-filled polymer blends containing two semicrystalline polymers.
Get PriceAC Conductivity of Selectively Located Carbon Nanotubes in
Apr 09 2010 · Positive temperature coefficient effect of polymer-carbon filler composites under self-heating evaluated quantitatively in terms of potential barrier height and width associated with tunnel current. Polymer 2012 53 (22) . DOI 10.1016/j.polymer.2012.08.065.
Get PriceDispersion of Single-Walled Carbon Nanotubes in Poly(ε
The dispersion of single-walled carbon nanotubes (SWNT) in poly(ε-caprolactone) with the aid of a zwitterionic surfactant is reported. Melt rheology and electrical conductivity measurements indicate geometrical percolation and electrical percolation for nanocomposites with ∼0.08 wt SWNT implying an effective anisotropy for the nanotubes of at least 600. Spectroscopic measurements and
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The invention discloses a making method of conductive composite material with positive-temperature coefficient effect which comprises the following steps (1) putting two blending polymers and conductive filler in the double-screw squeezing machine or sealed fusing machine to fuse 5-20 min with fusing temperature higher than fusing point of polymer by 10-50 deg.c (2) moulding the blending
Get PriceLocalization behavior of multiwalled carbon nanotubes in
blend phases in immiscible or compatible polymer blends having co-continuous morphology. This concept is known as double percolation and was initially described by Sum-ita et al. (1991 1992) for carbon black filled immiscible polymer blends and it has been applied for CNT filled polymer composites (Maiti et al. 2013 Poyekar et al. 2015).
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