Positive temperature coefficient effect and mechanism of compatible LLDPE/HDPE composites doping conductive graphite powders

Zhang, Peng; Wang, Bin‐bin

doi:10.1002/app.46453

Cited by 17 publications

(16 citation statements)

References 27 publications

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“…However, when the measurements were conducted for the second run at 40 and 30 °C consecutively after the elevated temperature (100 °C) run, the dielectric losses were found to increase again at approximately the same level as for the first run. Accordingly, the main contribution of the lowering of the dielectric losses was found to be linked to the thermal expansion of the composite for which the increase of temperature (50 to 100 °C) causes a slight separation of previously connected particles 14, [39][40][41][42] .…”

Section: Effect Of Temperature On the Electrical Responsesmentioning

confidence: 99%

Electrical and thermal phenomena in low‐density polyethylene/carbon black composites near the percolation threshold

Azizi

David

Fréchette

et al. 2018

J of Applied Polymer Sci

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Low-density polyethylene (LDPE)/carbon black (CB) composites were fabricated via meltcompounding technique. The percolation threshold was found to be around 20 wt% CB, and an electrical network formed by conductive CB was proven by SEM investigation. Dielectric responses depicted an interfacial relaxation peak at 20 wt% CB content. LDPE/CB composites showed an electric field-dependent conductivity as well as a hysteresis behavior around the percolation threshold region. The CB particles with high thermal conductivity increased the heat conductance of the LDPE/CB20 up to 56%. The dynamic mechanical analysis (DMA) of the LDPE/CB composites exhibited a noticeable contribution of CB throughout the composites, increasing the storage and loss modulus. The physical interactions between CB particles in the

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Section: Effect Of Temperature On the Electrical Responsesmentioning

confidence: 99%

Electrical and thermal phenomena in low‐density polyethylene/carbon black composites near the percolation threshold

Azizi

David

Fréchette

et al. 2018

J of Applied Polymer Sci

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“…Based on this principle, CPCs can be designed into various promising sensors, including strain sensor, [57,[69][70][71][72][73][74][75][76][77][78][79] pressure sensor, [80][81][82][83][84][85][86][87][88][89][90][91] temperature sensor, [92][93][94][95][96][97][98][99][100][101][102][103][104] and solvent sensor, [19,[105][106][107][108][109][110][111][112][113][114] to monitor the external stimuli, such as strain, pressure, temperature, solvent, and so on. Until now, there are already some published review articles, [115]…”

Section: Introductionmentioning

confidence: 99%

Recent Progress on Thermo-electrical Properties of Conductive Polymer Composites and Their Application in Temperature Sensors

Chen¹,

Zhu²,

Guo³

et al. 2020

Eng. Sci.

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Upon heating, the inner conductive pathway inside the conductive polymer composites (CPCs) changes, thus causing the change in electrical resistance. This thermo-electrical dependence of CPCs can be utilized to design CPCs-based temperature sensors. Herein, we systematically reviewed the recent progress on CPCsbased temperature sensors, as well as their mechanisms and applications in different fields. Finally, the question and challenge of CPCs-based temperature sensor are also discussed.

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“…Polymer blending influences PTC properties in three ways. First, some researchers found that different polymer matrix with different polymer crystallization behavior can exhibit different thermal volume expansion behavior and thus influence PTC behavior [24][25][26]. Luo et al [25] found that ethyl vinyl acetate (EVA)/LDPE/CB have lower PTC intensity and lower temperature at the maximum of resistivity exists than LDPE/CB, which is believed to be the result of imperfection of crystalline regions between EVA and LDPE.…”

Section: Introductionmentioning

confidence: 99%

Effects of POE and Carbon Black on the PTC Performance and Flexibility of High-Density Polyethylene Composites

Xue

Cai

et al. 2021

Advances in Polymer Technology

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High-density polyethylene (HDPE)/carbon black (CB) is widely used in positive temperature coefficient (PTC) composites. In order to expand its applications to fields that need good flexibility, polyolefin elastomer (POE) was incorporated into HDPE/CB composites as a secondary thermoplastic elastomer phase to provide flexibility. The effects of POE and CB content on the PTC performance and flexibility were investigated. Micro morphology and crystallization behavior are closely related to PTC properties. SEM was conducted to reveal phase morphology and filler dispersion, and DSC was conducted to research crystallization behavior. The results show that the incorporation of 18 wt.% POE can decrease the percolation threshold of conductive carbon black from 22.5 wt.% to 16 wt.%. When the CB content is 30 wt.%, the room temperature resistivity gradually increases with the increasing content of POE because of the barrier effect of POE phase, and the PTC intensity is gradually enhanced. Meanwhile, the PTC switching temperature shifts down to a lower temperature. The incorporation of 18 wt.% POE significantly increases the elongation at break, reaching an ultrahigh value of 980 wt.%, which means great flexibility has been achieved in HDPE/POE/CB composites. This work provides a new method of fabricating PTC composites with balanced electrical and mechanical properties.

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Positive temperature coefficient effect and mechanism of compatible LLDPE/HDPE composites doping conductive graphite powders

Cited by 17 publications

References 27 publications

Electrical and thermal phenomena in low‐density polyethylene/carbon black composites near the percolation threshold

Electrical and thermal phenomena in low‐density polyethylene/carbon black composites near the percolation threshold

Recent Progress on Thermo-electrical Properties of Conductive Polymer Composites and Their Application in Temperature Sensors

Effects of POE and Carbon Black on the PTC Performance and Flexibility of High-Density Polyethylene Composites

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