Enhanced positive temperature coefficient behavior of the high-density polyethylene composites with multi-dimensional carbon fillers and their use for temperature-sensing resistors

Zha, Jun‐Wei; Wu, Dong-Hong; Yu, Yang; Wu, Yunhui; Li, Robert K.Y.

doi:10.1039/c6ra27367j

Cited by 45 publications

(26 citation statements)

References 31 publications

(29 reference statements)

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“…Recently, the single or combined fillers in composites, including carbon nanotubes, graphene sheets, and so on, have been introduced to achieve the PTC repeatability and eliminate NTC effect of composites, owing to their synergistic effect, different aspect ratios, and high viscosity of polymer . On the other hand, the blending of more polymer components was designed the “sea island” effect or segregated structures to regulate the conductive networks .…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Wang

2018

J of Applied Polymer Sci

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Linear low density polyethylene (LLDPE)/high density polyethylene (HDPE) blends doped conductive graphite powders were constructed by the traditional melt‐blending method to acquire the conductive compatible polymer composites, and corresponding positive temperature coefficient (PTC) effect of electrical resistivity was investigated. The results indicated that the room‐temperature resistivity gradually decreased and PTC effects were remarkably enhanced by regulating the graphite contents or LLDPE/HDPE ratios. Especially, with increasing graphite contents, the polymer‐fixed composites showed the notable double PTC effects, originating from the volume expansion of the co‐crystallization or their fraction. Whereas, with increasing the LLDPE/HDPE ratio, the PTC effects of the graphite‐fixed composites occurred at the lower temperature, even far below the melting points of the co‐crystallization. Therefore, the regulation of co‐crystallization morphology of compatible polymer matrices was a new idea in the improvement of PTC materials. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46453.

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Section: Introductionmentioning

confidence: 99%

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

Zhang

Wang

2018

J of Applied Polymer Sci

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“…While nearly identical resistance responses to temperature variation was realized, the NTC effect still exists (Figure 9(C)). Following the same principle, MWCNTs were introduced into the CB/PE system to achieve a high PTC intensity as well as improved reproductivity 86 . The MWCNTs acted as a structural skeleton to confine the positions of CB so that the conductive network would not go through a dramatic change above the melting temperature of the polymer.…”

Section: Thermo‐responsive Electrical Switching Current Collectorsmentioning

confidence: 99%

Thermo‐responsive polymers for thermal regulation in electrochemical energy devices

Chen

2021

Journal of Polymer Science

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Thermo‐responsive polymers have been widely explored because of their diverse structures and functions in response to temperature stimuli. Great attention has been attracted to exploring and designing such polymers composites, which offer tremendous opportunities to build up a systematic understanding of their structure–function relationships and pave the ways for their extensive applications in electronics, soft robotics, and electrochemical energy storage devices. Here, we review the most recent research of thermal regulation in electrochemical energy storage devices (e.g., batteries, supercapacitors) via thermo‐responsive polymers. We summarize how battery components (i.e., electrolytes, separators, electrodes, or current collectors) can be coupled with thermo‐responsive polymers based on different operation mechanisms, such as volume expansion, polymerization, phase reversion, and de‐doping effects, to effectively prevent catastrophic thermal runaway. Different types of thermo‐responsive polymers are evaluated to compare their key features and/or limitations. This review is concluded with perspectives of future design strategies towards more effective thermo‐responsive polymers for battery thermal regulation.

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“…For example, the addition of a small amount of CNTs in carbon black (CB)/high density polyethylene (HDPE) composites could remarkably improve the electrical conductivity and thermal cyclic stability examined during the first three heating cycles, as tested in the potential use of transistors, sensors and actuators . This was explained by the synergistic effect of the simultaneous presence of CNTs and CB, which increases the number of conductive pathways and improves stability …”

Section: Tuning Positive Pyroresistive Behaviourmentioning

confidence: 99%

“…recently used modified CB and multi‐walled CNT filled HDPE to fabricate high performance PTC composites as flexible temperature resistivity sensors with a switching temperature of around 130 °C. Besides, the addition of small amounts of CNTs (0.7 wt%) was able to reduce the overall filler concentration but, surprisingly, to provide a larger PTC intensity and improved repeatability …”

Section: Recent Applications Of Pyroresistive Materialsmentioning

confidence: 99%

Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

Liu

Zhang

Porwal

et al. 2018

Polymer International

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Conductive polymer composites (CPCs) with pyroresistive behaviour are of interest for a wide variety of applications such as safe batteries, resettable fuses, temperature sensors and self‐regulating heating devices. Due to their ease of processing, low density, tunable electrical properties, good oxidation resistance, and good flexibility and toughness, CPCs have become the preferred choice of pyroresistive materials in a number of applications. The pyroresistive behaviour of CPCs can be tuned to satisfy the specific requirements of different applications. In this perspective paper, recent progress in the use of pyroresistive CPCs is reviewed. In particular, various factors influencing their performance are discussed and compared, in connection with the associated application, with a special focus on reproducibility and positive temperature coefficient intensity levels. Some of the remaining challenges are identified, together with future prospects in this evolving field. © 2018 Society of Chemical Industry

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Enhanced positive temperature coefficient behavior of the high-density polyethylene composites with multi-dimensional carbon fillers and their use for temperature-sensing resistors

Abstract: The synergistic effect of the modified CB and MWNT can improve the service time of positive temperature coefficient materials under harsh thermal control conditions.

Cited by 45 publications

References 31 publications

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

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

Thermo‐responsive polymers for thermal regulation in electrochemical energy devices

Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

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