Enhanced reproducibility of positive temperature coefficient effect of TPO/HDPE blends via elastic crosslinking

Yue, Zhouyao; Wang, Huashan; Hou, Xiurong; Shi, Yuting; Zhang, Xin

doi:10.1016/j.mtcomm.2022.105078

Cited by 3 publications

(4 citation statements)

References 21 publications

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“…45,116 The common crosslinking methods of polymers mainly include chemical crosslinking 117 and radiation crosslinking. 118 Yue et al 119 prepared the HDPE/TPO/CB composites by introducing CB and amorphous elastomer (TPO) into the HDPE using melting mixing and hot pressing methods and then treated the composites with isodipropylbenzene peroxide (DCP) crosslinking to improve the PTC performance. After the peroxidation cross-linking treatment, the percolation threshold of the cross-linked composites decreased from 24 wt% to 22 wt%, the NTC effect of the composite was also eliminated, and the resulting PTC composites exhibited good PTC reproducibility after three cycles.…”

Section: Processing Of Ptc Compositesmentioning

confidence: 99%

Strategies for improving positive temperature effects in conductive polymer composites – a review

Liu

Mei

et al. 2023

J. Mater. Chem. C

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Section: Processing Of Ptc Compositesmentioning

confidence: 99%

Strategies for improving positive temperature effects in conductive polymer composites – a review

Liu

Mei

et al. 2023

J. Mater. Chem. C

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“…13−15 High-performance polymer-based PTC typically possesses attributes such as high PTC intensity, 16 good PTC reproducibility, 17 low initial resistivity, 18 and an absence of negative temperature coefficient (NTC) effects. 19 Common strategies involve the establishment of a synergistic network between fillers 20,21 or the introduction of a secondary phase polymer, 22 both of which prove advantageous in enhancing PTC performance. Furthermore, modifications to conductive fillers, 23,24 the addition of auxiliaries, 25,26 and cross-linking treatments 27 are viable strategies for adjusting the microstructure of composite materials, promoting the formation of stable conductive networks, and enhancing the PTC reproducibility of the composite materials.…”

Section: ■ Introductionmentioning

confidence: 99%

“…High-performance polymer-based PTC typically possesses attributes such as high PTC intensity, good PTC reproducibility, low initial resistivity, and an absence of negative temperature coefficient (NTC) effects . Common strategies involve the establishment of a synergistic network between fillers , or the introduction of a secondary phase polymer, both of which prove advantageous in enhancing PTC performance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cyclic Stability and Pyro-Resistive Properties in High-Density Polyethylene/Tungsten Carbide Composites Under Thermal and Electric Activation

Dai,

Qi,

Gao

et al. 2024

ACS Appl. Electron. Mater.

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The investigation of cyclic stability holds paramount significance in the realm of conductive polymer composites (CPCs), specifically in applications related to overcurrent protection, self-heating, and sensors. This study employs a meltblending methodology to synthesize CPCs comprising high-density polyethylene (HDPE) and tungsten carbide (WC), with a focus on identifying the key factors influencing cyclic stability. A comparative analysis is conducted between two triggering mechanisms: external thermal activation and electric heating. The CPCs demonstrate a pronounced positive temperature coefficient (PTC) and exceptional cyclic stability when subjected to external thermal triggering. Subsequent to the electrical triggering of the composite material, the resistance change rate exhibits an increase with a rising impact voltage. Moreover, the rate of resistance variation correlates positively with a reduction in the WC content. Utilizing the dielectrophoresis theory model, this study scrutinizes alterations in the conductive network under an electric field, revealing agglomeration tendencies among particles of the CPCs. Significantly, the introduction of self-cross-linking agents proves effective in mitigating this phenomenon. Consequently, beyond ensuring external thermal cyclic stability, as well as that under electric field conditions, this emerges as a pivotal consideration in the realm of CPCs.

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“…To overcome these drawbacks, the combination of immiscible polymer blends [35][36][37][38][39][40][41] could be an alternative strategy based on the following two factors: (i) the PTCs will be confined in the immiscible polymer with higher T m when it is manifesting PTC property and (ii) the binary polymer system has superiority to control resistance of room temperature in practical production due to the expanded ranges of percolation derived from the additional phase morphology percolation transition. Based on immiscible high density polyethylene (HDPE)/ polyvinylidene fluoride (PVDF) system, Zhang et al 37 have reported that the PTCs with "sea-island" morphology exhibited preferable PTC reproducibility.…”

Section: Introductionmentioning

confidence: 99%

Achieving superior pyroresistive reproducibility at HDPE/PVDF composites with tailored conductive phase size

Chen,

Liu,

Liu

et al. 2023

Polymer Composites

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Commercial conductive polymer composites (CPCs) with positive temperature coefficient (PTC) behavior usually suffer from inherent poor reproducibility of pyroresistive property. Herein, a conductive carbon black (CB)/high density polyethylene (HDPE)/polyvinylidene fluoride (PVDF) composite with outstanding PTC reproducibility were prepared through introducing cellulose nanocrystals (CNCs) grafted with methyl methacrylate (CNC‐g‐PMMA). Following the minimum interfacial energy mechanism, the CNC‐g‐PMMA tends to locate in PVDF of binary polymer composites. A much finer morphology of conductive CB/HDPE phase is hence obtained owing to the increasement of PVDF/HDPE viscosity ratio by introducing CNC‐g‐PMMA. Undergoing multiple repeated temperature cycles, the room temperature resistance and PTC intensity of as‐prepared material keep almost unchanged, which demonstrates superior PTC reproducibility. The improving mechanism of PTC reproducibility has also been illustrated in detail. This research provides a facile and valid strategy to enhance the PTC reproducibility and will vastly expand the application of PTC composites in the field of intelligent temperature management.Highlights Assembling binary polymer‐based PTC materials with cocontinuous structure Nanocrystals enables conductive HDPE phase with finer morphology. The precise ranges of viscosity ratio ensure the co‐continuous morphology. Small conductive phase size enhances P reproducibility. Narrow spatial domain restricts the self‐aggregation of conductive fillers.

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Enhanced reproducibility of positive temperature coefficient effect of TPO/HDPE blends via elastic crosslinking

Cited by 3 publications

References 21 publications

Strategies for improving positive temperature effects in conductive polymer composites – a review

Strategies for improving positive temperature effects in conductive polymer composites – a review

Investigation of Cyclic Stability and Pyro-Resistive Properties in High-Density Polyethylene/Tungsten Carbide Composites Under Thermal and Electric Activation

Achieving superior pyroresistive reproducibility at HDPE/PVDF composites with tailored conductive phase size

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