A study on electrical and thermal conductivities of ethylene-octene copolymer/expandable graphite composites

Petr Svoboda; Rajesh Theravalappil; Sameepa Poongavalappil; Jarmila Vilcakova; Dagmar Svobodova; Pavel Mokrejs; Antonin Blaha

doi:10.1002/pen.22192

A study on electrical and thermal conductivities of ethylene-octene copolymer/expandable graphite composites

Petr Svoboda^*, Rajesh Theravalappil, Sameepa Poongavalappil, Jarmila Vilcakova, Dagmar Svobodova, Pavel Mokrejs, Antonin Blaha

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

A series of ethylene-octene copolymer (EOC) composites have been prepared by melt-mixing with different weight ratios of expandable graphite filler (0-50% by weight). Electrical conductivity [both alternating current (AC) and direct current (DC)] and thermal conductivity studies were carried out. Effect of filler loading and frequency on electrical conductivity was studied. DC conductivity has increased from 1.51 × 10^-13 S cm^-1 to 1.17 × 10^-1 S cm^-1. Percolation threshold by DC and also AC methods was observed at about 16 vol% of the filler. Real part of permittivity was found to be decreasing with increase in frequency while conductivity was increasing. Thermal conductivity was also found to be increasing gradually from 0.196 to 0.676 Wm^-1 K^-1 which is about 245% increase. Graphite not only increases the electrical and thermal conductivities but at and above 40 wt%, also acts as a halogen-free, environmental friendly flame retardant. Shore-A hardness of EOC/graphite composites shows that even with high graphite loading, the hardness is increased from about 50-68 only so that the rubbery nature of the composite is not affected very much.

Original language	English
Pages (from-to)	1241-1249
Number of pages	9
Journal	Polymer Engineering and Science
Volume	52
Issue number	6
DOIs	https://doi.org/10.1002/pen.22192
State	Published - Jun 2012
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
Polymers and Plastics
Materials Chemistry

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title = "A study on electrical and thermal conductivities of ethylene-octene copolymer/expandable graphite composites",

abstract = "A series of ethylene-octene copolymer (EOC) composites have been prepared by melt-mixing with different weight ratios of expandable graphite filler (0-50\% by weight). Electrical conductivity [both alternating current (AC) and direct current (DC)] and thermal conductivity studies were carried out. Effect of filler loading and frequency on electrical conductivity was studied. DC conductivity has increased from 1.51 × 10-13 S cm-1 to 1.17 × 10-1 S cm-1. Percolation threshold by DC and also AC methods was observed at about 16 vol\% of the filler. Real part of permittivity was found to be decreasing with increase in frequency while conductivity was increasing. Thermal conductivity was also found to be increasing gradually from 0.196 to 0.676 Wm-1 K-1 which is about 245\% increase. Graphite not only increases the electrical and thermal conductivities but at and above 40 wt\%, also acts as a halogen-free, environmental friendly flame retardant. Shore-A hardness of EOC/graphite composites shows that even with high graphite loading, the hardness is increased from about 50-68 only so that the rubbery nature of the composite is not affected very much.",

author = "Petr Svoboda and Rajesh Theravalappil and Sameepa Poongavalappil and Jarmila Vilcakova and Dagmar Svobodova and Pavel Mokrejs and Antonin Blaha",

year = "2012",

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doi = "10.1002/pen.22192",

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journal = "Polymer Engineering and Science",

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T1 - A study on electrical and thermal conductivities of ethylene-octene copolymer/expandable graphite composites

AU - Svoboda, Petr

AU - Theravalappil, Rajesh

AU - Poongavalappil, Sameepa

AU - Vilcakova, Jarmila

AU - Svobodova, Dagmar

AU - Mokrejs, Pavel

AU - Blaha, Antonin

PY - 2012/6

Y1 - 2012/6

N2 - A series of ethylene-octene copolymer (EOC) composites have been prepared by melt-mixing with different weight ratios of expandable graphite filler (0-50% by weight). Electrical conductivity [both alternating current (AC) and direct current (DC)] and thermal conductivity studies were carried out. Effect of filler loading and frequency on electrical conductivity was studied. DC conductivity has increased from 1.51 × 10-13 S cm-1 to 1.17 × 10-1 S cm-1. Percolation threshold by DC and also AC methods was observed at about 16 vol% of the filler. Real part of permittivity was found to be decreasing with increase in frequency while conductivity was increasing. Thermal conductivity was also found to be increasing gradually from 0.196 to 0.676 Wm-1 K-1 which is about 245% increase. Graphite not only increases the electrical and thermal conductivities but at and above 40 wt%, also acts as a halogen-free, environmental friendly flame retardant. Shore-A hardness of EOC/graphite composites shows that even with high graphite loading, the hardness is increased from about 50-68 only so that the rubbery nature of the composite is not affected very much.

AB - A series of ethylene-octene copolymer (EOC) composites have been prepared by melt-mixing with different weight ratios of expandable graphite filler (0-50% by weight). Electrical conductivity [both alternating current (AC) and direct current (DC)] and thermal conductivity studies were carried out. Effect of filler loading and frequency on electrical conductivity was studied. DC conductivity has increased from 1.51 × 10-13 S cm-1 to 1.17 × 10-1 S cm-1. Percolation threshold by DC and also AC methods was observed at about 16 vol% of the filler. Real part of permittivity was found to be decreasing with increase in frequency while conductivity was increasing. Thermal conductivity was also found to be increasing gradually from 0.196 to 0.676 Wm-1 K-1 which is about 245% increase. Graphite not only increases the electrical and thermal conductivities but at and above 40 wt%, also acts as a halogen-free, environmental friendly flame retardant. Shore-A hardness of EOC/graphite composites shows that even with high graphite loading, the hardness is increased from about 50-68 only so that the rubbery nature of the composite is not affected very much.

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DO - 10.1002/pen.22192

M3 - Article

AN - SCOPUS:84861346649

SN - 0032-3888

VL - 52

SP - 1241

EP - 1249

JO - Polymer Engineering and Science

JF - Polymer Engineering and Science

IS - 6

ER -

A study on electrical and thermal conductivities of ethylene-octene copolymer/expandable graphite composites

Abstract

ASJC Scopus subject areas

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