Thermal, electrical and rheological behavior of high-density polyethylene/graphite composites

Luo, Wei; Cheng, Cheng; Zhou, Shengtai; Zou, Huawei; Liang, Mei

doi:10.1007/s13726-015-0348-x

Cited by 23 publications

(24 citation statements)

References 42 publications

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“…This indicates that sufficient conductive pathways are constructed within corresponding microparts when the LTEG concentration is 30 wt% (i.e., 14.9 vol%), suggesting that lower weight fractions of LTEG fillers are required to obtain enough conductive pathways within molded samples, which is consistent with the findings by Luo et al [22]. According to the literature [22][23][24][25], the in situ exfoliation of LTEG during the melt blending process is essential to the formation of conductive network in polymer composites. In addition, the average particle size of LTEG (about 180 μm) is larger than that of SG (nearly 20 μm).…”

Section: Electrical Conductivity Measurementssupporting

confidence: 89%

“…Recently, it has been reported that the low-temperature expandable graphite (LTEG) is an efficient additive that can significantly enhance the overall thermal and electrical conductivity of thermoplastic polymers at a relatively lower filler concentration when compared with flake graphite (FG) [22][23][24][25]. For example, Luo et al [22] found that the percolation concentration, p c , for LTEG filled high-density polyethylene composites is about 20 wt%, which is half of that obtained from their FG-containing counterparts. Similar findings have been reported by Zhou et al [21,24] in terms of enhancing the thermal conductivity of graphite-loaded polyamide 6 (PA6) composites.…”

Section: Introductionmentioning

confidence: 99%

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Properties of microinjection‐molded polypropylene/graphite composites

Zhou

Hrymak

Kamal

et al. 2019

Polymer Engineering & Sci

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In this study, polypropylene (PP) composites filled with two different types of graphite particles, that is, flake‐shaped synthetic graphite (SG) and low‐temperature expandable graphite (LTEG), were prepared by melt blending, followed by microinjection molding (μIM). The microparts had three consecutive zones with decreasing thickness along the flow direction (FD). Results showed that, in addition to the larger particle size, the in situ exfoliation of LTEG during melt processing is crucial to the overall enhancement of electrical conductivity when compared with their SG‐containing counterparts, as corroborated by morphology observations. Moreover, the preferential alignment of conductive particles favors the construction of conductive pathways along the FD. The melting and crystallization behavior for PP, PP/LTEG, and PP/SG materials, and samples from each section of the corresponding microparts were evaluated by differential scanning calorimetry. Results indicated that both the addition of graphite particles and the typical thermomechanical history of μIM (i.e., high shearing and cooling rates) experienced in different sections of the three‐step microparts influence the melting and crystallization behavior of the composites. POLYM. ENG. SCI., 59:1560–1569 2019. © 2019 Society of Plastics Engineers

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Section: Electrical Conductivity Measurementssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Properties of microinjection‐molded polypropylene/graphite composites

Zhou

Hrymak

Kamal

et al. 2019

Polymer Engineering & Sci

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“…[94][95][96][97] It is further recommended to verify the impact on other macroscopic properties. [75,[98][99][100][101] It has been additionally indicated that the extrudate swell is influenced by the filler shape as well. It has been, for instance, reported that a larger swell ratio is obtained for LDPE composites with fillers having a smaller size.…”

Section: Effect Of Polymer Materials Parametersmentioning

confidence: 99%

State of the‐Art for Extrudate Swell of Molten Polymers: From Fundamental Understanding at Molecular Scale toward Optimal Die Design at Final Product Scale

Tang

Marchesini

Cardon

et al. 2020

Macro Materials & Eng

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Exit velocity profiles for parallel die and die optimized using conical widening or narrowing. Reproduced permission. [164] Copyright 2010, Elsevier Ltd. c) Average velocity of each outflow subsection of the slit die (width = 100 mm and height = 1.5 mm), Reproduced with permission. [173] Copyright 2012, Elsevier Ltd. d,e) The geometry profiles of the Catheter cross section covered as case study. f) The velocity distribution at the die outflow for different trials-T0: the original die profile; T1: r 2 varies from 0.9 to 0.95 mm; T2: r 2 varies from 0.95 to 0.9 mm, θ 2 varies from 45° to 43°; T3: r 2 varies from 0.9 to 0.95 mm; T4: θ 2 varies from 43° to 40°; T5: r 3 varies from 0.7 to 0.65 mm. Reproduced with permission. [166] Copyright 2013, Elsevier. g) The corresponding objective function evolution in consecutive trials. Reproduced with permission. [166] Copyright 2013, Elsevier Ltd.

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“…Polyethylene (PE) belongs to insulating materials, like a majority of polymers, with electrical resistivity exceeding 10 15 Ωm . The introduction of conductive fillers leads to electrical conductivity, strongly dependent on the amount of specific additives . For a low filler content, the conductive particles are secluded in the insulating resin and electrical charge cannot be transferred among them.…”

Section: Introductionmentioning

confidence: 99%

“…1 The introduction of conductive fillers leads to electrical conductivity, strongly dependent on the amount of specific additives. [2][3][4][5][6] For a low filler content, the conductive particles are secluded in the insulating resin and electrical charge cannot be transferred among them. When the filler concentration increases up to the percolation threshold-the minimal filler content that makes the composite electrically conductive 3,5,6 -its particles come into contact with each other.…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity and mechanical properties of carbon black modified polyolefinic blends influenced by phase inversion

Mysiukiewicz

Sterzyński

Ławniczak

et al. 2017

J of Applied Polymer Sci

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Electrically conductive polymer composites (CPCs) containing a carbonaceous filler and a polymeric matrix have been widely researched and utilized. Immiscible polymers are often used as the matrix of CPCs, which leads to segregated structures, hence low percolation threshold and good conductivity of a material. Polymeric blends often show low mechanical properties due to the lack of affinity of the resins. A way to improve toughness of a CPC and maintain good electrical properties is mixing two immiscible yet compatible resins. In our case one of them was polyethylene and the other was an olefinic conductive thermoplastic elastomer. In this study, a correlation between conductivity, mechanical properties, and morphology of conductive blends was analyzed. Results of tensile test, conductivity measurements, and differential scanning calorimetry were juxtaposed with information of phase morphology of the blends. A relationship of drastic changes of different properties of the blends and phase inversion point was found. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45512.

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Thermal, electrical and rheological behavior of high-density polyethylene/graphite composites

Cited by 23 publications

References 42 publications

Properties of microinjection‐molded polypropylene/graphite composites

Properties of microinjection‐molded polypropylene/graphite composites

State of the‐Art for Extrudate Swell of Molten Polymers: From Fundamental Understanding at Molecular Scale toward Optimal Die Design at Final Product Scale

Electrical conductivity and mechanical properties of carbon black modified polyolefinic blends influenced by phase inversion

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