Easy Fabrication and Resistivity-Temperature Behavior of an Anisotropically Conductive Carbon Nanotube−Polymer Composite

Li, Bo; Zhang, Yichuan; Li, Zhong‐Ming; Li, Sha-Ni; Zhang, Xiaona

doi:10.1021/jp9042396

Cited by 51 publications

(27 citation statements)

References 39 publications

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“…A different situation is found by Jeon et al [40] in isotactic polypropylene based CPCs loaded with SWCNT, where it is concluded that network connectivity is enhanced when crystals grow as the curls and twists of the CNT are reduced when embedded in crystals and their contribution to the formation of the infinite cluster is improved. In PE/CNT cooled from the melt, Li et al [41] also found a conductivity increase upon crystallization attributed to the dominant shrinkage effect over the disruption on the conductive network. This same behavior has been reported by Fernandez et al [8] in polyurethane/CNT for samples crystallized from the melt, for p > p c .…”

Section: Resultsmentioning

confidence: 99%

Effect of cold‐crystallization on the AC and DC conductive properties of polylactide biocomposites with carboxylic or neat large aspect ratio MWCNT

et al. 2012

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After DC and AC conductivity measurements, percolation parameters, universality, and time‐temperature‐concentration superposition are evaluated in biocomposites based on poly(lactide) loaded with multiwalled carbon nanotubes either carboxylic, PLA/c‐CNT, or pure but with a larger aspect ratio, PLA/LAR‐CNT, in weight concentrations up to 7%. The polymer matrix is either 100% amorphous or cold‐crystallized. Wide angle X‐ray scattering is used to extract the crystallinity at each temperature. The nucleating effect for the cold crystallization of the PLA is greater for the LAR‐CNT than for the carboxylic ones. DC and AC conductivities are measured in broad frequency and temperature ranges, from 1 mHz to 1 MHz and from 133 to 378 K, respectively. The critical percolation value increases for c‐CNTs (from 1.8 to 2.4 vol%) upon cold crystallization of the PLA matrix as the formation of a conductive path is hindered by the existence of a crystalline phase, which is dominant over the reduction of the amorphous regions. No significant changes upon crystallization were found in the critical concentration value (0.6 vol%) for the LAR composites, where the conductive path is 2D. The universal scaling found here for different concentrations is lost when temperature varies. However, time‐temperature superposition is present for each concentration of LAR or carboxylic CNTs. POLYM. COMPOS., 2013. © 2012 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Effect of cold‐crystallization on the AC and DC conductive properties of polylactide biocomposites with carboxylic or neat large aspect ratio MWCNT

et al. 2012

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“…The conducting composites based on crystalline polymer as the matrix and the conducting fillers, such as carbon black (CB) [1][2][3][4], carbon nanotubes (CNTs) [4][5][6][7], carbon fibers [8], graphite powders (GPs) [9,10], or metal particles [11][12][13][14], have been extensively investigated over the last several decades, because of their special electrical properties and potential application [15,16]. The positive temperature coefficient of resistivity (PTCR) was one of the most important electrical properties of the conducting composites.…”

Section: Introductionmentioning

confidence: 99%

Resistivity-temperature behavior and morphology of low density polyethylene/graphite powder/graphene composites

2013

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In this work, the positive-temperature-coefficient (PTC) effect of resistivity of low density polyethylene/graphite powder (45%) composites (LDPE/GP) in the presence of graphene before and after crosslinked was comparatively investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy, Raman spectrum, and resistivitytemperature test. The composites showed the repeatability of the PTC effect with heating cycles and a certain improvement in the room temperature resistivity. After crosslinked, the composites presented a higher PTC trip temperature at about 140 C than pure LDPE (T m 5 112 C), and stronger PTC intensity than room temperature resistivity (over 5 orders of magnitude). The results from DSC, XRD, and Raman spectrum indicated that the addition of graphene resulted in the gradual enhancement in the crystallization of LDPE matrix, which was the origin of the improvement of the PTC behavior of the composites. As a result, we could conclude that the additional conducting filler could improve the PTC effect of the conducting composite system. POLYM. COMPOS., 00:000-000, 2013.

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“…Other researchers reported that the conductive pathways were broken in the early stage of crystallization and conductive particles were expelled from the crystalline phase. Based on that, during the late stage of crystallization, the conductive pathways were compacted caused by the volume shrinkage of amorphous [6,7].As for conductive particles, some researchers reported that the movement ability of the particles could influence the formation of conductive network in the matrix [8].Though many researchers studied the relationship between conductivity and crystallization process, few people could describe the connection between evolution of conductive network and crystallization mechanism. Existing literatures lay particular stress on the electrical variation of composites before and after the crystallization and speculated the form of conductive network.…”

Section: Introductionmentioning

confidence: 99%

New understanding for the formation of conductive network in the nanocomposites during the crystallization of matrix

et al. 2016

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Crystallization behavior of conductive composite has a great effect on the formation of conductive network. But very few studies have exposited, specially on the micro level, the evolution of conductive network during the crystallization of matrix. In this study, the conductive network was found to be destroyed by crystallization behavior of isotactic polypropylene (iPP) matrix, and the carbon black (CB) particles were rejected to the amorphous region or the interlamellar of spherulite. By comparison, the low-structure carbon black (LCB) filled system was more sensitive to the crystallization of matrix than the high-structure carbon black (HCB) filled system because of the morphology and interaction force of the CB primary aggregate. A secondary increase in volume resistivity during terminal crystallization was observed in iPP/LCB composite when it isothermally crystallized at a certain temperature. In that case, an analysis of crystallization kinetics of composites through a modified Lauritzen-Hoffman model indicated that the transition from regime I→II in the isothermal crystallization process of iPP matrix showed significant influence on the network formation of LCB particles.

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Easy Fabrication and Resistivity-Temperature Behavior of an Anisotropically Conductive Carbon Nanotube−Polymer Composite

Cited by 51 publications

References 39 publications

Effect of cold‐crystallization on the AC and DC conductive properties of polylactide biocomposites with carboxylic or neat large aspect ratio MWCNT

Effect of cold‐crystallization on the AC and DC conductive properties of polylactide biocomposites with carboxylic or neat large aspect ratio MWCNT

Resistivity-temperature behavior and morphology of low density polyethylene/graphite powder/graphene composites

New understanding for the formation of conductive network in the nanocomposites during the crystallization of matrix

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